WO2022145599A1 - Appareil de collecte permettant de collecter des poussières fines générées à partir d'un dispositif de freinage de moyens de transport - Google Patents

Appareil de collecte permettant de collecter des poussières fines générées à partir d'un dispositif de freinage de moyens de transport Download PDF

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Publication number
WO2022145599A1
WO2022145599A1 PCT/KR2021/007704 KR2021007704W WO2022145599A1 WO 2022145599 A1 WO2022145599 A1 WO 2022145599A1 KR 2021007704 W KR2021007704 W KR 2021007704W WO 2022145599 A1 WO2022145599 A1 WO 2022145599A1
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Prior art keywords
collector
porous ceramic
rotor
ceramic foam
foam
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PCT/KR2021/007704
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English (en)
Korean (ko)
Inventor
황광택
김진호
김정헌
최청수
Original Assignee
한국세라믹기술원
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Priority claimed from KR1020200185420A external-priority patent/KR102538298B1/ko
Application filed by 한국세라믹기술원 filed Critical 한국세라믹기술원
Publication of WO2022145599A1 publication Critical patent/WO2022145599A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details

Definitions

  • the present invention relates to a collecting device, and more particularly, to a collecting device for collecting fine dust generated by friction between a rotor and a brake pad in a brake device of a transport engine.
  • the number of particles (fine dust) emitted by the non-exhaust pipe (non-exhaust system) is increasing due to the increase in transport facilities.
  • Transport institutions such as automobiles do not have a device for collecting fine dust caused by wear of brake pads and tires, so there is a problem that the air environment is polluted.
  • the development of a filter capable of collecting dust is required.
  • a new concept of filter material and technology is required for a collection filter to collect fine dust generated from non-exhaust systems of transportation such as brake pads and tires due to the specificity of the environment (temperature, moisture, vibration, etc.).
  • the collection filter for collecting fine dust generated from the brake device must be installed around the brake pad, where the surface temperature is expected to rise by more than several hundred degrees (up to 700°C) due to friction, so it is required to secure heat resistance, It is necessary to develop a filter material with excellent durability against contamination of the filter by dust and vibrations caused by vehicle driving.
  • NOx and SOx can be removed by catalyst or self-ignition, but fine dust generated from non-exhaust systems is difficult to oxidize. Differentiated technologies must be applied.
  • An object of the present invention is to provide a collecting device for collecting fine dust generated by friction between a rotor and a brake pad in a brake device of a transportation engine.
  • the present invention is a device for collecting fine dust generated by friction between a rotor and a brake pad in a brake device of a transportation engine, and includes a first collector surrounding a portion of an outer surface of the rotor, and a portion of an outer peripheral surface of the rotor An upper collector and a second collector surrounding a portion of an inner surface of the rotor, wherein the first collector and the second collector are formed of a porous ceramic foam.
  • the collecting device is provided in a U-shape in appearance to partially accommodate the rotor into the U-shaped interior.
  • the first collector is provided to face the outer surface of the rotor
  • the second collector is provided to face the inner surface of the rotor
  • the second collector is provided with the first collector with respect to the disk-shaped rotor It is preferable that the first collector and the second collector face each other with respect to the rotor.
  • the collection device includes a first collector cover for covering and protecting the first collector and preventing the fine dust flowing into the first collector from leaking to the outside, and a first collector cover for covering and protecting the second collector and flowing into the second collector It may further include a second collector cover for preventing the fine dust from leaking to the outside.
  • An upper collector cover for protecting the upper collector may be further provided on the upper collector.
  • Holes may be formed in the upper collector cover to allow clean air filtered by the upper collector to escape to the outside.
  • the porous ceramic foam is composed of alumina (Al 2 O 3 ), cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (3Al 2 O 3 ⁇ 2SiO 2 ) and silicon carbide (SiC). It may be made of one or more ceramic materials selected from the group.
  • the porous ceramic foam preferably has a porosity of 40 to 90%.
  • the porous ceramic foam may include pores (cells) that serve as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells). , a plurality of whiskers may protrude from the surface of the wall toward the pores (cells).
  • the whisker may be made of at least one needle-shaped ceramic material selected from the group consisting of mullite (3Al 2 O 3 ⁇ 2SiO 2 ), ZnO, and silicon carbide (SiC).
  • the porous ceramic foam may include a first region in which pores having a relatively small size compared to the second region are distributed, and a second region in which pores having a relatively large size compared to the first region are distributed, Area 1 may collect fine dust having a smaller size than fine dust collected in the second area.
  • the second region is located closer to the rotor than the first region.
  • the upper collector may be formed of a porous ceramic foam.
  • the first collector and the second collector may be formed of a porous ceramic foam having a stepped portion protruding to cover a portion of an outer circumferential surface of the rotor.
  • the porous ceramic foam is coated with a hydrophobic coating film and may exhibit hydrophobicity.
  • the first collector and the second collector may include ribs arranged in a serpentine type and a channel forming an empty space between the ribs.
  • the ribs have a curved shape.
  • a rib block may be provided at an end of the rib, and the rib block is a medium connecting the rib and the rib, and fine dust generated by friction between the rotor and the brake pad is may be introduced through the inlet of the channel, and in the Y-axis direction perpendicular to the X-axis, which is the rotation axis of the rotor, an empty space between the inlet of the channel and the rib block constitutes the channel, and the X-axis and Y-axis In the Z-axis direction perpendicular to the axis, an empty space between the ribs may be a region forming the channel.
  • the present invention it is possible to efficiently collect fine dust generated by friction between a rotor and a brake pad in a brake device of a transportation engine. Air pollution can be prevented by reducing fine dust generated during braking of transport institutions.
  • FIGS. 1 and 2 are diagrams illustrating an example of a collection device for collecting fine dust generated from a brake device of a transportation engine.
  • FIG 3 is a view showing an example of a state in which the collecting device is coupled to the brake device.
  • FIG. 4 is a view schematically showing an example of a porous ceramic foam.
  • FIG. 5 is a diagram schematically illustrating an example of a structure in which a whisker protrudes from a surface of a wall.
  • FIG. 6 is a view schematically showing another example of the porous ceramic foam.
  • FIG. 7 is a cutaway view of a portion of the porous ceramic foam shown in FIG. 6 in order to more clearly show the first region (A) and the second region (B).
  • FIG 8 and 9 are views schematically showing another example of the porous ceramic foam.
  • FIGS. 8 and 9 are partially exploded perspective view schematically showing a collecting device to which the porous ceramic foam shown in FIGS. 8 and 9 is applied.
  • FIG. 11 is a view showing an example of a state in which the collecting device to which the porous ceramic foam shown in FIGS. 8 and 9 is applied is coupled to the brake device.
  • FIG. 13 is a photograph showing a state in which the ceramic slurry was dip-coated on the polymer foam according to Experimental Example 1 and dried.
  • the term "transportation institution” is used in the sense that includes not only automobiles, trucks, buses, and railroad vehicles, but also two-wheeled vehicles such as motorcycles.
  • the term "pore” is used to include not only the pores forming the cell between the wall and the wall, but also the pores formed in the wall.
  • a collection device is a device for collecting fine dust generated by friction between a rotor and a brake pad in a brake device of a transportation engine, and includes a first collector surrounding a part of an outer surface of the rotor; An upper collector enclosing a portion of an outer circumferential surface of the rotor and a second collector enclosing a portion of an inner surface of the rotor, wherein the first collector and the second collector are made of porous ceramic foam.
  • the collecting device is provided in a U-shape in appearance to partially accommodate the rotor into the U-shaped interior.
  • the first collector is provided to face the outer surface of the rotor
  • the second collector is provided to face the inner surface of the rotor
  • the second collector is provided with the first collector with respect to the disk-shaped rotor It is preferable that the first collector and the second collector face each other with respect to the rotor.
  • the collection device includes a first collector cover for covering and protecting the first collector and preventing the fine dust flowing into the first collector from leaking to the outside, and a first collector cover for covering and protecting the second collector and flowing into the second collector It may further include a second collector cover for preventing the fine dust from leaking to the outside.
  • An upper collector cover for protecting the upper collector may be further provided on the upper collector.
  • Holes may be formed in the upper collector cover to allow clean air filtered by the upper collector to escape to the outside.
  • the porous ceramic foam is composed of alumina (Al 2 O 3 ), cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (3Al 2 O 3 ⁇ 2SiO 2 ) and silicon carbide (SiC). It may be made of one or more ceramic materials selected from the group.
  • the porous ceramic foam preferably has a porosity of 40 to 90%.
  • the porous ceramic foam may include pores (cells) that serve as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells). , a plurality of whiskers may protrude from the surface of the wall toward the pores (cells).
  • the whisker may be made of at least one needle-shaped ceramic material selected from the group consisting of mullite (3Al 2 O 3 ⁇ 2SiO 2 ), ZnO, and silicon carbide (SiC).
  • the porous ceramic foam may include a first region in which pores having a relatively small size compared to the second region are distributed, and a second region in which pores having a relatively large size compared to the first region are distributed, Area 1 may collect fine dust having a smaller size than fine dust collected in the second area.
  • the second region is located closer to the rotor than the first region.
  • the upper collector may be formed of a porous ceramic foam.
  • the first collector and the second collector may be formed of a porous ceramic foam having a stepped portion protruding to cover a portion of an outer circumferential surface of the rotor.
  • the porous ceramic foam is coated with a hydrophobic coating film and may exhibit hydrophobicity.
  • the first collector and the second collector may include ribs arranged in a serpentine type and a channel forming an empty space between the ribs.
  • the ribs have a curved shape.
  • a rib block may be provided at an end of the rib, and the rib block is a medium connecting the rib and the rib, and fine dust generated by friction between the rotor and the brake pad is may be introduced through the inlet of the channel, and in the Y-axis direction perpendicular to the X-axis, which is the rotation axis of the rotor, an empty space between the inlet of the channel and the rib block constitutes the channel, and the X-axis and Y-axis In the Z-axis direction perpendicular to the axis, an empty space between the ribs may be a region forming the channel.
  • FIGS. 1 and 2 are diagrams illustrating an example of a collection device for collecting fine dust generated from a brake device of a transportation engine.
  • 3 is a view showing an example of a state in which the collecting device is coupled to the brake device.
  • 4 is a view schematically showing an example of a porous ceramic foam.
  • the brake device is a device that performs braking by friction generated between a brake pad 20 and a rotor 10 .
  • the brake device has a disk-shaped rotor 10 that is connected to the axle to rotate, and an axial direction (X) in the rotor 10 to brake the rotation of the rotor 10 (direction perpendicular to the disk-shaped surface)
  • the brake pad 20 for applying pressure to the rotor 10, and the brake pad 20 in close contact with the rotor 10 or by separating the brake pad 20 in contact with the rotor 10 from the rotor 10 Includes a brake caliper (30) for controlling the rotation of.
  • the rotor 10 is a disk-shaped device that is connected to the axle and rotates.
  • the rotor 10 may include a first disk surface 10a perpendicular to the X-axis and a second disk surface 10b parallel to the first disk surface.
  • the first disk surface 10a and the second disk surface 10b may be coupled to each other by a rim or the like.
  • the brake pad 20 is a device for braking the rotation of the rotor 10 by applying pressure to the rotor 10 in the axial direction (X direction) (direction perpendicular to the surface forming the disk shape).
  • the brake pad 20 may include a first pad (not shown) for applying pressure to the first disc surface 10a and a second pad (not shown) for applying pressure to the second disc surface 10b. have.
  • the brake pad 20 is mounted on the brake caliper 30 so as to move along the axial direction (X direction).
  • the brake caliper 30 is for controlling the rotation of the rotor 10 by keeping the brake pad 20 in close contact with the rotor 10 or by separating the brake pad 20 in contact with the rotor 10 from the rotor 10 . It is a device
  • the brake pad 20 is accommodated in the brake caliper 30, a first pad (not shown) provided to face the rotor 10 while looking at the first disk surface 10a, and a second disk surface 10b It may include a second pad (not shown) provided to face the rotor 10 while looking at the .
  • the brake caliper 30 may be provided in a U-shape in overall appearance to surround a portion of the rotor 10 .
  • Fine dust harmful to the human body is generated due to friction between the brake pad 20 and the rotor 10 .
  • fine dust generated by wear of the brake pad 20 has a small particle size and may have a direct effect on the human body and the environment.
  • the amount of particulates emitted from brake devices due to an increase in traffic volume is increasing.
  • the collection device for collecting fine dust generated from the brake device of a transportation engine must be installed around the brake pad 20, which is expected to increase the surface temperature by more than several hundred degrees due to friction, it is required to secure heat resistance, It is necessary to develop a filter material with excellent durability against contamination of the device and vibration caused by vehicle driving.
  • the collecting device is a device for collecting fine dust (dust) generated by friction between the brake pad 20 and the rotor 10 .
  • the collecting device suctions and collects fine dust (dust) generated when the brake pad 20 or the rotor 10 is worn while the rotor 10 and the brake pad 20 come into contact with each other during braking while driving.
  • the collecting device according to a preferred embodiment of the present invention may be provided to be replaceable.
  • the collection device according to a preferred embodiment of the present invention may be replaced after use for a certain period of time or reused after removing fine dust.
  • the shape and installation position of the collecting device may change according to the positions of the brake pad 20 and the brake caliper 30 .
  • the collecting device is preferably installed behind the brake pad 20 (behind the brake pad when viewed from the rotational direction of the rotor) from the position of the brake pad 20 when viewed from the forward running direction of the transport engine.
  • Installing the collecting device behind the position of the brake pad 20 means that fine dust (dust) generated by the friction between the brake pad 20 and the rotor 10 when the transport engine is traveling forward is caused by wind, etc. This is because it is advantageous to flow into the collection device and collects more fine dust.
  • the collecting device may be provided to collect fine dust without power. Fine dust (dust) can be efficiently sucked into the collection device naturally by the direction of the air flowing while the vehicle is running (air flow).
  • the collecting device may be provided in a form that surrounds a part of the rotor 10 .
  • the collecting device may be provided in a U-shape in overall appearance so as to surround a portion of the rotor 10 .
  • the collecting device is configured to partially receive the rotor 10 into a U-shaped interior.
  • the collecting device includes a first collector 110 surrounding a portion of the outer surface (first disk surface 10a) of the rotor 10, an upper collector 130 surrounding a portion of the outer circumferential surface of the rotor 10, A second collector 120 may be included to surround a portion of the inner surface (the second disk surface 10b) of the rotor 10 .
  • the first collector 110 is provided to face the outer surface (the first disk surface 10a) of the rotor 10 .
  • the second collector 120 is provided to face the inner surface (the second disk surface 10b) of the rotor 10 .
  • the second collector 120 is installed to be positioned opposite the first collector 110 with respect to the disk-shaped rotor 10 .
  • the first collector 110 and the second collector 120 are disposed to face each other with respect to the rotor 10 .
  • the first collector 110 and the second collector 120 are disposed to be spaced apart from the rotor 10 .
  • the upper collector 130 is provided to surround a part of the outer circumferential surface of the rotor 10 .
  • the upper collector 130 may be connected to the first collector 110 and the second collector 120 .
  • the upper collector 130 is also installed to be spaced apart from the rotor 10 .
  • Collector covers 160 and 170 for protecting the first collector 110 and the second collector 120 and suppressing the fine dust flowing into the channel from leaking to the outside may be further provided.
  • the collector covers 160 and 170 may be made of a material such as a synthetic resin having good workability and a light weight, for example, a thermosetting synthetic resin, but a material having good durability and resistance to impact such as a metal or a metal alloy may be used.
  • the collector cover covers and protects the first collector 110, and covers and protects the first collector cover 160 and the second collector 120 to prevent fine dust flowing into the channel from leaking to the outside, and flows into the channel. It may include a second collector cover 170 for preventing the fine dust from leaking to the outside.
  • the first collector cover 160 is provided on the opposite side of the rotor 10 with respect to the first collector 110
  • the second collector cover 170 is provided on the opposite side of the rotor 10 with respect to the second collector 120 .
  • the collector covers 160 and 170 may serve to prevent foreign substances such as dust from entering the rotor 10 .
  • the first collector cover 160 may be configured to completely cover the side surface of the first collector 110 , and may be configured to be in close contact with the side surface of the first collector 110 .
  • the second collector cover 170 may be configured to completely cover the side surface of the second collector 120 , and may be configured to be in close contact with the side surface of the second collector 120 .
  • Holes may be formed in the first collector cover 160 to allow clean air filtered by the first collector 110 to escape to the outside. Fine dust generated by friction between the rotor 10 and the brake pad 20 is collected by the first collector 110 , and the clean air that has passed through the first collector 110 fills the holes of the first collector cover 160 . It is possible to suppress an increase in the temperature around the rotor 10 by allowing the discharge to pass through. Holes may also be formed in the second collector cover 170 to allow clean air filtered by the second collector 120 to escape to the outside. Fine dust generated by friction between the rotor 10 and the brake pad 20 is collected by the second collector 120 , and the clean air passing through the second collector 120 fills the holes of the second collector cover 170 . It is possible to suppress an increase in the temperature around the rotor 10 by allowing the discharge to pass through.
  • An upper collector cover 180 for protecting the upper collector 130 may be further provided.
  • the upper collector cover 180 may be made of a material such as a synthetic resin having good workability and a light weight, for example, a thermosetting synthetic resin, but a material having good durability and resistance to impact such as a metal or a metal alloy may be used.
  • the upper collector cover 180 may be provided on the upper collector 130 .
  • the upper collector cover 180 may be disposed on the outer circumferential surface of the rotor 10 to prevent foreign substances such as dust from entering the rotor 10 . Holes may be formed in the upper collector cover 180 to allow clean air filtered by the upper collector 130 to escape to the outside.
  • Fine dust generated by friction between the rotor 10 and the brake pad 20 is collected by the upper collector 130 , and the clean air that has passed through the upper collector 130 is discharged through the holes of the upper collector cover 180 . It can suppress that the temperature of the periphery of the rotor 10 rises by doing this.
  • the first collector 110 and the second collector 120 may be formed in a straight shape from one end to the other end, and more preferably have a curved shape (refer to 210 in FIG. 2 ) from one end to the other end. More preferably, the first collector 110 and the second collector 120 have a curved shape identical to the disk curvature of the disk-shaped rotor 10 .
  • the curvature of the first collector 110 and the second collector 120 forming a curved shape is preferably the same as the disk curvature of the rotor 10 having a disk shape.
  • the first collector 110 and the second collector 120 are made of porous ceramic foam. Since the first collector 110 and the second collector 120 are installed around the rotor 10, the surface temperature of which is expected to rise by several hundred degrees or more due to friction between the rotor 10 and the brake pad 20, it is required to secure heat resistance. Durability is required against contamination by rainwater or dust and vibrations caused by vehicle driving.
  • the first collector 110 and the second collector 120 are alumina (Al 2 O 3 ), cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (3Al 2 ) O 3 ⁇ 2SiO 2 ), it is preferably made of a porous ceramic foam (ceramic porous body) having heat resistance such as silicon carbide (SiC) or a mixture thereof.
  • the first collector 110 and the second collector 120 may be formed of a porous ceramic foam having a stepped portion 200 protruding to cover a portion of an outer peripheral surface of the rotor 10 .
  • the porous ceramic foam is a porous body having countless pores.
  • the porous ceramic foam includes pores (cells) serving as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells).
  • the large pores between the wall and the wall are also called cells, and smaller pores than the cells are formed in the wall, and the pores in the porous ceramic foam include not only the pores formed in the wall but also the cells. .
  • the porous ceramic foam preferably has a porosity of 40 to 90%, more preferably about 60 to 85%. If the porosity is too low, fine dust filtering efficiency may be low, and if the porosity is too high, cracks or breakage may occur easily due to vibration or impact, and thus durability may be reduced.
  • the size of the pores (cells) distributed in the porous ceramic foam is preferably about 50 ⁇ m to 2 mm, and the size of the pores formed on the wall is preferably about 50 nm to 50 ⁇ m.
  • the porous ceramic foam may be coated with a hydrophobic coating film in order to suppress the formation of water droplets on the surface.
  • a porous ceramic foam may be manufactured by coating the porous ceramic material with a hydrophobic material.
  • the hydrophobic coating film is preferably provided with a thickness of about 10 nm to 2 ⁇ m.
  • the hydrophobic coating film can be formed by coating a paste, suspension or colloid on the outer surface of the porous ceramic foam and heat-treating it at a temperature of about 400 to 1000°C.
  • a case of coating the boehmite-TiO 2 sol may be exemplified.
  • the boehmite-TiO 2 sol can be prepared as follows.
  • Boehmite is added to a solvent such as distilled water and hydrolyzed at a temperature of about 60°C, and an acid such as nitric acid (HNO 3 ) is added thereto for peptization Forms an emetic sol.
  • a solvent such as distilled water and hydrolyzed at a temperature of about 60°C
  • an acid such as nitric acid (HNO 3 ) is added thereto for peptization
  • TiO 2 precursor is added to a solvent such as distilled water, hydrolyzed at a temperature of about 50 ° C., and an acid such as nitric acid (HNO 3 ) is added thereto for peptization to obtain TiO 2 sol. to form
  • the TiO 2 precursor may be titanium isopropoxide (TTIP) or the like.
  • the boehmite sol and the TiO 2 sol are mixed to obtain a boehmite-TiO 2 sol.
  • the upper collector 130 may also be formed of a porous ceramic foam.
  • the upper collector 130 is alumina (Al 2 O 3 ), cordierite (cordierite, 2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (mullite, 3Al 2 O 3 ⁇ 2SiO 2 ), silicon carbide (SiC) or It is preferable to form a porous ceramic foam having heat resistance, such as a mixture thereof.
  • the upper collector 130 is disposed on the outer peripheral surface of the rotor 10 and also serves to prevent foreign substances such as dust from entering the rotor 10 .
  • a porous polymer foam (eg, polyurethane foam) is used as a substrate to prepare the porous ceramic foam.
  • the polymer foam is a porous material having elasticity, such as a sponge.
  • the porosity, pore size, etc. of the polymer foam affect the porosity, pore size, etc. of the porous ceramic foam to be manufactured later.
  • After forming a polymer foam to correspond to the shape of the porous ceramic foam to be manufactured it is washed and dried through ultrasonic cleaning or the like.
  • the porous ceramic foam has the stepped portion 200 protruding to cover a portion of the outer circumferential surface of the rotor 10, the polymer foam is also formed to have a stepped portion.
  • the drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the polymer foam.
  • a starting material including a ceramic raw material, a binder and a solvent is prepared.
  • the ceramic raw material is a main material of the porous ceramic foam (ceramic porous body) to be produced.
  • the ceramic raw material is alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder, silicon carbide (SiC) It may be a powder or a mixed powder thereof.
  • the starting material may further include a glass frit.
  • the glass frit is preferably contained in an amount of 0.01 to 45 parts by weight, more preferably 0.1 to 40 parts by weight, based on 100 parts by weight of the ceramic raw material in the starting material.
  • the glass frit may serve to lower the sintering temperature and to contain Si in the porous ceramic foam itself, as well as to improve the growth property of the whisker.
  • the solvent may be distilled water or the like.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting material may further include a dispersing agent.
  • the dispersant may use a commercially available material, and there is no particular limitation on its use.
  • the dispersant is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting materials are mixed to form a ceramic slurry.
  • the ceramic slurry is dip-coated on the polymer foam.
  • the polymer foam is completely immersed in the ceramic slurry and dip coating is performed in a vacuum atmosphere.
  • the polymer foam is compressed by applying an external force to remove the excess slurry contained in the polymer foam, and then released to return to the original polymer foam form, and in this way, some of the slurry contained in the polymer foam is It can also be pulled out of the polymer foam.
  • the drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the polymer foam.
  • Polymer foam with dip coating is sintered.
  • the polymer foam with dip coating is charged in a furnace, etc., and the temperature is raised to a first temperature (for example, 400 to 800° C.) higher than the burning temperature of the polymer foam, and then maintained for a predetermined time to burn the polymer component.
  • a first temperature for example, 400 to 800° C.
  • the sintering temperature eg, 1100 to 1600° C.
  • alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, and mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder are used as the ceramic raw material.
  • Silver is preferably carried out in an oxidizing atmosphere such as air or oxygen (O 2 ), and when silicon carbide (SiC) powder is used as the ceramic raw material, it is preferably carried out in a reducing atmosphere. It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned and disappears, and since sintering is performed at a temperature higher than the temperature at which the organic component is burned, all organic components are removed when the sintering process is completed, and the space where the polymer is located is pore , and the sintered body that has undergone the sintering process becomes porous.
  • the porous ceramic foam thus prepared is a porous body having countless pores.
  • the porous ceramic foam includes pores (cells) serving as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells).
  • a whisker may be formed on the porous ceramic foam. More specifically, the porous ceramic foam has pores (cells) serving as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells). It may include, and a plurality of whiskers may protrude from the surface of the wall toward the pores (cells).
  • the whisker may be made of at least one needle-shaped ceramic material selected from the group consisting of mullite (3Al 2 O 3 ⁇ 2SiO 2 ), ZnO, and silicon carbide (SiC).
  • the whisker may be compared to the hair of a human nose, the pores may be compared to the nostrils, and the wall may be compared to the nasal wall (the portion of the nose that surrounds the nostrils). Since a person's nose has nasal hairs, it is possible to better filter dust and the like flowing into the nostrils.
  • 5 is a diagram schematically illustrating an example of a structure in which a whisker protrudes from a surface of a wall. Referring to FIG.
  • the porous ceramic foam forms a strut of the porous ceramic foam between pores (cells) 112 serving as passageways for fine dust to flow in, and pores (cells). It includes a wall 114, and a plurality of whiskers 116 protrude from the surface of the wall 114 toward the pores (cells) 112, thereby maximizing the filtering effect of fine dust. .
  • the whisker serves to effectively collect fine dust while suppressing an increase in differential pressure during filtering.
  • a starting material including a source material, a binder and a solvent constituting the whisker is prepared.
  • the source material serves to provide a source of a component constituting a main material of a whisker to be manufactured.
  • Al metal salts such as alumina and aluminum tri sec butoxide may be used as the Al source, and as the Si source, silica sol, TEOS (Tetraethyl orthosilicate), glass , glass frit, fly ash, feldspar, kaolin, clay, Kyanite, etc. may be used.
  • the source material may further include mullite powder, which serves as a seed for mullite crystal growth.
  • the source material may further include a material such as AlF 3 , NH 4 F serving as an F source.
  • the solvent may be distilled water or the like.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the source material in the starting material.
  • the starting material may further include a dispersing agent.
  • the dispersant may use a commercially available material, and there is no particular limitation on its use.
  • the dispersant is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the source material in the starting material.
  • the starting material may further include a thickener.
  • the thickener may use a commercially available material, and there is no particular limitation on its use.
  • the thickener serves to increase the viscosity of the ceramic slurry, which will be described later, to decrease the precipitation rate.
  • the thickener is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the source material in the starting material.
  • the starting materials are mixed to form a ceramic slurry.
  • the ceramic slurry is dip-coated on the porous ceramic foam. It is preferable to completely immerse the porous ceramic foam in the ceramic slurry and perform dip coating in a vacuum atmosphere.
  • Dry the porous ceramic foam with dip coating is preferably performed in an oven of about 30 to 90 °C.
  • the porous ceramic foam with dip coating is sintered.
  • the porous ceramic foam with dip coating is charged in a furnace, etc., heated to a sintering temperature (eg, 1100 to 1600° C.), and then maintained at the sintering temperature for a predetermined time to sinter to obtain a porous ceramic foam with whiskers. .
  • the sintering is preferably performed in an oxidizing atmosphere such as air or oxygen (O 2 ). It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity. Therefore, it is preferable to raise the temperature at a temperature increase rate in the above range.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned away, and since the sintering is performed at a temperature higher than the temperature at which the organic component burns, all the organic components are removed when the sintering process is completed.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, the pores (cells) serving as passageways for fine dust to flow in, and the struts of the porous ceramic foam between the pores (cells). ), and a plurality of mullite whiskers protrude from the surface of the wall toward pores (cells).
  • a seed solution is formed by mixing a solvent and a source material constituting the whisker.
  • the source material serves to provide a source of a component constituting ZnO, which is a main material of a whisker to be manufactured.
  • As the source material zinc nitrate hexahydrate (Zn(NO 3 ) 2 .6H 2 O) serving as a source of Zn may be used.
  • the solvent may be an alcohol such as ethanol.
  • the seed solution is dip-coated on the porous ceramic foam. It is preferable to completely immerse the porous ceramic foam in the seed solution and perform dip coating in a vacuum atmosphere.
  • Annealing the porous ceramic foam with dip coating By the annealing, the seed solution may be well adhered to the porous ceramic foam.
  • the annealing is preferably performed in an oven at about 120 to 300 °C.
  • a starting material including a source material constituting the whisker, a growth promoter, a binder, and a solvent is prepared.
  • the source material serves to provide a source of a component constituting ZnO, which is a main material of a whisker to be manufactured.
  • As the source material zinc nitrate hexahydrate (Zn(NO 3 ) 2 .6H 2 O) serving as a source of Zn may be used.
  • the growth promoter may be hexamethylenetetramine (Hexamethylenetetramine) powder or the like.
  • the growth promoter is preferably contained in an amount of 50 to 200 parts by weight based on 100 parts by weight of the source material in the starting material.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the source material in the starting material.
  • the solvent may be an alcohol such as ethanol.
  • the starting materials are mixed to form a growth solution.
  • the growth solution is dip-coated on the annealed porous ceramic foam. It is preferable to completely immerse the porous ceramic foam in the growth solution and perform dip coating in a vacuum atmosphere.
  • the porous ceramic foam is sintered with a porous ceramic foam that has been dip-coated with a growth solution.
  • a porous ceramic foam having a dip coating with a growth solution is charged in a furnace, etc., heated to a sintering temperature (eg, 1000 to 1500° C.), and then maintained at the sintering temperature for a predetermined time and sintered to form a porous ceramic with whiskers. get the form
  • the sintering is preferably performed in an oxidizing atmosphere such as air or oxygen (O 2 ). It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned away, and since the sintering is performed at a temperature higher than the temperature at which the organic component burns, all the organic components are removed when the sintering process is completed.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, the pores (cells) serving as passageways for fine dust to flow in, and the struts of the porous ceramic foam between the pores (cells). ), and a plurality of ZnO whiskers protrude from the surface of the wall toward pores (cells).
  • the porous ceramic foam is loaded into a growth device such as a tube furnace.
  • a growth device such as a tube furnace.
  • silica powder and carbon powder to be used as a source of whisker growth.
  • the silica powder and the carbon powder have a weight ratio of 1:1 to 1:2.
  • the temperature in the growth device is raised to a reaction temperature (eg, 1350 to 1600° C.), and silica powder and carbon powder are introduced into the growth device using a carrier gas to introduce a porous ceramic Allow SiC whiskers to grow on the foam surface.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, with pores (cells) serving as passageways for fine dust to flow in, and a skeleton (cell) of the porous ceramic foam between the pores (cells).
  • strut and a plurality of SiC whiskers protrude from the surface of the wall toward pores (cells).
  • the method of manufacturing the porous ceramic foam and the method of forming the whisker on the porous ceramic foam have been described, the method of manufacturing the porous ceramic foam and the method of forming the whisker may vary and are not limited to the above-described examples.
  • the upper collector 130 may be formed of the above-described porous ceramic foam, but may also be formed of a ceramic fiber filter in which ceramic fibers are entangled in a network form.
  • the pores distributed in the upper collector 130 preferably have an average size of 50 nm to 10 ⁇ m.
  • the ceramic fiber is alumina (Al 2 O 3 ), cordierite (cordierite, 2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (mullite, 3Al 2 O 3 ⁇ 2SiO 2 ), silicon carbide (SiC) or these It is preferable that the mixture is made of a ceramic material having heat resistance.
  • the upper collector 130 made of a ceramic fiber material may be manufactured by a method such as electrospinning the ceramic fiber. For example, by electrospinning a solution containing ceramic fibers under the conditions of a voltage difference of 1 to 100 kV, a spinning flow rate of 0.1 to 10 ml/hr, a spinning distance of 2 to 50 cm, and a nozzle hole size of 0.01 to 2.0 mm, the ceramic fibers are formed. Ceramic fiber filters entangled in a network can be manufactured.
  • the configuration of the collecting device is the same as that of the first embodiment, and only the porous ceramic foam constituting the first collector 110, the second collector 120, or the upper collector 130 is configured differently, so the description of the collecting device is omit Hereinafter, only the porous ceramic foam different from that in Example 1 will be described.
  • the first collector 110 and the second collector 120 are made of porous ceramic foam.
  • the first collector 110 and the second collector 120 are alumina (Al 2 O 3 ), cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (mullite, 3Al 2 O 3 ⁇ 2SiO 2 ) ), silicon carbide (SiC), or a mixture thereof is preferably made of a porous ceramic foam having heat resistance.
  • the first collector 110 and the second collector 120 may be formed of a porous ceramic foam having a stepped portion 200 protruding to cover a portion of an outer peripheral surface of the rotor 10 .
  • the porous ceramic foam preferably has a porosity of 40 to 90%, more preferably about 60 to 85%. If the porosity is too low, fine dust filtering efficiency may be low, and if the porosity is too high, cracks or breakage may occur easily due to vibration or impact, and thus durability may be reduced.
  • the size of the pores (cells) distributed in the porous ceramic foam is preferably about 50 ⁇ m to 2 mm, and the size of the pores formed on the wall is preferably about 50 nm to 50 ⁇ m.
  • the upper collector 130 may also be formed of a porous ceramic foam.
  • the upper collector 130 is alumina (Al 2 O 3 ), cordierite (cordierite, 2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (mullite, 3Al 2 O 3 ⁇ 2SiO 2 ), silicon carbide (SiC) or It is preferable to form a porous ceramic foam having heat resistance, such as a mixture thereof.
  • the upper collector 130 is disposed on the outer peripheral surface of the rotor 10 and also serves to prevent foreign substances such as dust from entering the rotor 10 .
  • the porous ceramic foam is a porous body having countless pores.
  • the porous ceramic foam includes pores (cells) serving as passageways through which fine dust is introduced, and a wall forming a strut of the porous ceramic foam between the pores (cells).
  • the porous ceramic foam has a first region (A) in which pores having a relatively small size are distributed compared to the second region (B), and a second region in which pores having a relatively large size are distributed compared to the first region (A). (B) is included.
  • FIG. 6 shows a first region (A) in which pores having a relatively small size are distributed compared to the second region (B), and a second region (B) in which pores having a relatively large size are distributed compared to the second region (A). It is a view schematically showing a porous ceramic foam including It is a drawing.
  • the porous ceramic foam has a first region (A) in which pores (pores of a first size) having a relatively smaller size than that of the second region (B) are distributed, and a first It may include a second region B in which pores (pores of second size) having a relatively larger size than that of the region A are distributed, and the first region A is formed in the second region B. It is possible to collect fine dust of a smaller size than the collected fine dust. It is preferable that the pores of the second size have an average particle diameter larger than that of the pores of the first size, and that the second area B is located closer to the rotor than the first area A.
  • the porous ceramic foam including the first region (A) and the second region (B) may be coated with a hydrophobic coating film to suppress water droplets from forming on the surface.
  • a porous ceramic foam may be manufactured by coating the porous ceramic material with a hydrophobic material.
  • the hydrophobic coating film is preferably provided with a thickness of about 10 nm to 2 ⁇ m.
  • a porous polymer foam (eg, polyurethane foam) is used as a substrate to prepare the porous ceramic foam.
  • the polymer foam is a porous material having elasticity, such as a sponge.
  • the porosity, pore size, etc. of the polymer foam affect the porosity, pore size, etc. of the porous ceramic foam to be manufactured later.
  • After cutting the polymer foam to correspond to the shape of the porous ceramic foam to be manufactured it is washed and dried through ultrasonic cleaning or the like. The drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the polymer foam.
  • a starting material including a ceramic raw material, a binder and a solvent is prepared.
  • the ceramic raw material is a main material of the porous ceramic foam (ceramic porous body) to be produced.
  • the ceramic raw material is alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder, silicon carbide (SiC) It may be a powder or a mixed powder thereof.
  • the starting material may further include a glass frit.
  • the glass frit is preferably contained in an amount of 0.01 to 45 parts by weight, more preferably 0.1 to 40 parts by weight, based on 100 parts by weight of the ceramic raw material in the starting material.
  • the glass frit may serve to lower the sintering temperature and to contain Si in the porous ceramic foam itself, as well as to improve the growth property of the whisker.
  • the solvent may be distilled water or the like.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting material may further include a dispersing agent.
  • the dispersant may use a commercially available material, and there is no particular limitation on its use.
  • the dispersant is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting materials are mixed to form a ceramic slurry.
  • the ceramic slurry is dip-coated on the polymer foam.
  • the polymer foam is completely immersed in the ceramic slurry and dip coating is performed in a vacuum atmosphere.
  • the polymer foam is compressed by applying an external force to remove the excess slurry contained in the polymer foam, and then released to return to the original polymer foam form, and in this way, some of the slurry contained in the polymer foam is It can also be pulled out of the polymer foam.
  • the drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the polymer foam.
  • Polymer foam with dip coating is sintered.
  • the polymer foam with dip coating is charged in a furnace, etc., and the temperature is raised to a first temperature (for example, 400 to 800° C.) higher than the burning temperature of the polymer foam, and then maintained for a predetermined time to burn the polymer component.
  • a first temperature for example, 400 to 800° C.
  • the sintering temperature eg, 1100 to 1600° C.
  • the sintering is maintained at the sintering temperature for a predetermined time, and the porous ceramic foam is obtained by furnace cooling.
  • alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, and mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder are used as the ceramic raw material.
  • Silver is preferably carried out in an oxidizing atmosphere such as air or oxygen (O 2 ), and when silicon carbide (SiC) powder is used as the ceramic raw material, it is preferably carried out in a reducing atmosphere. It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned and disappears, and since sintering is performed at a temperature higher than the temperature at which the organic component is burned, all organic components are removed when the sintering process is completed, and the space where the polymer is located is pore , and the sintered body that has undergone the sintering process becomes porous.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, the pores (cells) serving as passageways for fine dust to flow in, and the struts of the porous ceramic foam between the pores (cells). ), and pores (pores of the second size) of the same or similar size to the second region (B) in which pores having a relatively larger size than that of the first region (A) are distributed .
  • a starting material including a ceramic raw material, a binder, and a solvent to form a first region (A) in which pores (pores of the first size) having a relatively smaller size than that of the second region (B) are distributed .
  • the ceramic raw material it is preferable to use a powder of the same material as the ceramic, which is the main component of the porous ceramic foam.
  • the ceramic raw material is alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder, silicon carbide (SiC) It may be a powder or a mixed powder thereof.
  • the porous ceramic foam In consideration of the porosity, pore size, strength, etc. of the porous ceramic foam to be manufactured, it is preferable to use a powder having an average particle diameter of about 10 nm to 40 ⁇ m, more preferably 100 nm to 30 ⁇ m, as the ceramic raw material.
  • the starting material may further include a glass frit.
  • the glass frit is preferably contained in an amount of 0.01 to 45 parts by weight, more preferably 0.1 to 40 parts by weight, based on 100 parts by weight of the ceramic raw material in the starting material.
  • the glass frit may serve to lower the sintering temperature and to contain Si in the porous ceramic foam itself, as well as to improve the growth property of the whisker.
  • the solvent may be distilled water or the like.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting material may further include a dispersing agent.
  • the dispersant may use a commercially available material, and there is no particular limitation on its use.
  • the dispersant is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting materials are mixed to form a ceramic slurry.
  • the ceramic slurry is coated on a porous ceramic foam in which pores of the second size are distributed.
  • the coating is selectively performed by immersing only the tip (surface portion) of the porous ceramic foam to be coated, instead of completely immersing the porous ceramic foam in the ceramic slurry and then taking it out.
  • the slurry is coated only to a certain depth from the surface of the porous ceramic foam, and the portion coated with the slurry is uncoated.
  • the pores having a size smaller than the portion (pores of the first size) are distributed.
  • the portion on which the slurry is not coated becomes a region (second region) of the porous ceramic foam having pores (pores of the second size) having relatively larger sizes compared to the first region (A), and the portion on which the slurry is coated becomes a region (first region) of the porous ceramic foam having pores (pores of the first size) having a relatively small size compared to the second region (B).
  • Dry the porous ceramic foam with optional coating is preferably performed in an oven of about 30 to 90 °C.
  • a porous ceramic foam with selective coating is sintered.
  • the porous ceramic foam with selective coating is charged in a furnace, etc., and the temperature is raised to a first temperature higher than the burning temperature of the polymer (eg, 400 to 800° C.), and then maintained for a predetermined time to burn the polymer component.
  • the temperature is raised to the sintering temperature (eg, 1000 to 1500° C.)
  • the porous ceramic foam having the first region (A) and the second region (B) formed by sintering is maintained at the sintering temperature for a predetermined time.
  • alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, and mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder are used.
  • Silver is preferably carried out in an oxidizing atmosphere such as air or oxygen (O 2 ), and when silicon carbide (SiC) powder is used as the ceramic raw material, it is preferably carried out in a reducing atmosphere. It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned away, and since the sintering is performed at a temperature higher than the temperature at which the organic component burns, all the organic components are removed when the sintering process is completed.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, the pores (cells) serving as passageways for fine dust to flow in, and the struts of the porous ceramic foam between the pores (cells). ), and in the first region (A), relatively small-sized pores (pores of the first size) are distributed compared to the second region (B), and in the second region (B), the second region (B) The pores (pores of the second size) having a relatively larger size than that of the first region (A) are distributed.
  • the porous ceramic foam including the first region (A) and the second region (B) may be manufactured by the following method. Hereinafter, another example of manufacturing the porous ceramic foam including the first region (A) and the second region (B) will be described.
  • Two porous polymer foams are used as a substrate to prepare a porous ceramic foam including the first region (A) and the second region (B) do.
  • Two polymer foams (the first polymer foam and the second polymer foam) are used to have different pore sizes (PPI; Pore per inch), for example, the average pore size of the first polymer foam is the average pore size of the second polymer foam Use one smaller than the size.
  • the first and second polymer foams are porous materials having elasticity, such as a sponge. The porosity, pore size, etc. of the polymer foam affect the porosity, pore size, etc. of the porous ceramic foam to be manufactured later.
  • the first and second polymer foams are cut to fit the size of the specimen to be manufactured, and then washed and dried through ultrasonic cleaning or the like.
  • the drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the polymer foam.
  • a starting material including a ceramic raw material, a binder and a solvent is prepared.
  • the ceramic raw material is a main material of the porous ceramic foam (ceramic porous body) to be produced.
  • the ceramic raw material is alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder, silicon carbide (SiC) It may be a powder or a mixed powder thereof.
  • the starting material may further include a glass frit.
  • the glass frit is preferably contained in an amount of 0.01 to 45 parts by weight, more preferably 0.1 to 40 parts by weight, based on 100 parts by weight of the ceramic raw material in the starting material.
  • the glass frit may serve to lower the sintering temperature and to contain Si in the porous ceramic foam itself, as well as to improve the growth property of the whisker.
  • the solvent may be distilled water or the like.
  • the binder may be polyvinyl alcohol (PVA), polyethylene glycol (PEG), or the like.
  • PVA polyvinyl alcohol
  • PEG polyethylene glycol
  • the binder serves to improve the adhesion of the ceramic slurry.
  • the binder is preferably contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting material may further include a dispersing agent.
  • the dispersant may use a commercially available material, and there is no particular limitation on its use.
  • the dispersant is preferably contained in an amount of 0.1 to 25 parts by weight based on 100 parts by weight of the ceramic raw material in the starting material.
  • the starting materials are mixed to form a ceramic slurry.
  • the ceramic slurry is dip-coated on the first and second polymer foams.
  • the first and second polymer foams are completely immersed in the ceramic slurry, and dip coating is performed in a vacuum atmosphere.
  • the first and second polymer foams are compressed by applying an external force to take out the excess slurry contained in the first and second polymer foams, and then released to return to the original polymer foam form, in this way may cause some of the slurry contained in the first and second polymer foams to escape from the first and second polymer foams.
  • the first polymer foam coated with the dip coating and the second polymer foam coated with the dip coating are overlapped and dried in an overlapping state.
  • the drying is preferably performed in an oven of about 30 to 90 °C lower than the melting temperature of the first and second polymer foams.
  • the first polymer foam and the second polymer foam are overlapped to sinter the dried product.
  • the first polymer foam and the second polymer foam are overlapped and the dried result is charged into a furnace, and the temperature is raised to a first temperature (eg, 400 to 800° C.) higher than the burning temperature of the first and second polymer foams. After that, it is maintained for a predetermined time so that the polymer component is burned and removed, and the temperature is raised to the sintering temperature (eg, 1100 to 1600° C.)
  • the sintering temperature eg, 1100 to 1600° C.
  • alumina (Al 2 O 3 ) powder, cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ) powder, and mullite (3Al 2 O 3 ⁇ 2SiO 2 ) powder are used as the ceramic raw material.
  • Silver is preferably carried out in an oxidizing atmosphere such as air or oxygen (O 2 ), and when silicon carbide (SiC) powder is used as the ceramic raw material, it is preferably carried out in a reducing atmosphere. It is preferable to increase the temperature up to the sintering temperature at a temperature increase rate of 1 to 50 ° C./min. If the temperature increase rate is too slow, it takes a long time to decrease productivity.
  • the furnace temperature is lowered.
  • the furnace cooling may be performed to cool in a natural state by shutting off the furnace power, or to cool by arbitrarily setting a temperature drop rate (eg, 10°C/min). have. It is desirable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.
  • the organic (or polymer) component is burned and disappears, and since sintering is performed at a temperature higher than the temperature at which the organic component is burned, all organic components are removed when the sintering process is completed, and the space where the polymer is located is pore , and the sintered body that has undergone the sintering process becomes porous.
  • a porous ceramic foam consisting of a single body is formed.
  • the first polymer foam and the second polymer foam are used to have different pore sizes (PPI; Pore per inch), and the region where the first polymer foam is positioned and the region where the second polymer foam is positioned have different pore sizes. Accordingly, the region (the first region) having pores (pores of the first size) having a relatively small size compared to the second region and pores having a relatively large size (second size) compared to the first region A porous ceramic foam in which the region (the second region) having the pores) is separated can be obtained.
  • the porous ceramic foam prepared in this way is a porous body having countless pores, the pores (cells) serving as passageways for fine dust to flow in, and the struts of the porous ceramic foam between the pores (cells). ), and in the first region (A), relatively small-sized pores (pores of the first size) are distributed compared to the second region (B), and in the second region (B), the second region (B) The pores (pores of the second size) having a relatively larger size than that of the first region (A) are distributed.
  • a whisker may also be formed in the porous ceramic foam in which the branch region (the second region) is divided. More specifically, the first region (A) of the porous ceramic foam has pores (cells) serving as passageways for fine dust to flow in, and a strut of the porous ceramic foam between the pores (cells). ), a plurality of whiskers may protrude from the surface of the wall toward pores (cells), and the second region (B) of the porous ceramic foam also serves as a passageway for fine dust to flow in.
  • the pores formed in the first region (A) of the porous ceramic foam are distributed in relatively small sizes compared to the pores formed in the second region (B) of the porous ceramic foam.
  • the whisker may be made of at least one needle-shaped ceramic material selected from the group consisting of mullite (3Al 2 O 3 ⁇ 2SiO 2 ), ZnO, and silicon carbide (SiC).
  • a plurality of whiskers protrude from the surface of the wall toward the pores (cells), thereby maximizing the filtering effect of fine dust.
  • the whisker serves to effectively collect fine dust while suppressing an increase in differential pressure during filtering.
  • the configuration of the collecting device is the same as that of the first embodiment, and only the porous ceramic foam constituting the first collector 110 and the second collector 120 is configured differently, so the description of the collecting device will be omitted.
  • the porous ceramic foam different from that in Example 1 will be described.
  • the first collector 110 and the second collector 120 are made of porous ceramic foam.
  • the first collector 110 and the second collector 120 are alumina (Al 2 O 3 ), cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2 ), mullite (mullite, 3Al 2 O 3 ⁇ 2SiO 2 ) ), silicon carbide (SiC), or a mixture thereof is preferably made of a porous ceramic foam having heat resistance.
  • the porous ceramic foam preferably has a porosity of 40 to 90%, more preferably about 60 to 85%. If the porosity is too low, fine dust filtering efficiency may be low, and if the porosity is too high, cracks or breakage may occur easily due to vibration or impact, and thus durability may be reduced.
  • the size of the pores (cells) distributed in the porous ceramic foam is preferably about 50 ⁇ m to 2 mm, and the size of the pores formed on the wall is preferably about 50 nm to 50 ⁇ m.
  • the porous ceramic foam is a porous body having countless pores.
  • the porous ceramic foam includes pores (cells) serving as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells).
  • the porous ceramic foam applied to the first collector 110 and the second collector 120 includes ribs 140 arranged in a serpentine type and a channel 150 forming an empty space between the ribs and the ribs.
  • the ribs 140 are arranged staggering each other in a zigzag as shown in FIGS. 8 to 11 rather than being arranged in a straight line.
  • the ribs 140 are arranged in a meandering form in the form of a serpentine type.
  • the ribs 140 may be formed in a straight line from one end to the other end, and more preferably in a curved shape from one end to the other end. More preferably, the ribs 140 have a curved shape identical to the disk curvature of the rotor 10 having a disk shape.
  • the curvature of the ribs forming the curved shape is preferably the same as the disk curvature of the rotor 10 having the disk shape.
  • the distance between the ribs and the ribs is preferably the same, but is not limited thereto.
  • Fine dust (dust) generated by friction between the brake pad 20 and the rotor 10 is introduced along the channel 150 through the inlet 155 .
  • the channel 150 is an empty space between the ribs and the ribs, and provides a path through which fine dust is introduced.
  • the channel 150 is opened through the inlet 155 through which the fine dust is introduced and is blocked by the rib and the rib block connecting the ribs.
  • the empty space between the inlet 155 and the rib block 145 forms a channel
  • the empty space between the inlet 155 and the rib block 145 forms a channel
  • the Z-axis direction (X-axis) and in a direction perpendicular to the Y-axis) is an area in which the rib and the empty space between the ribs form a channel.
  • the inlet 155 faces the brake pad 20 .
  • FIGS. 8 to 11 show a porous ceramic foam comprising eight ribs (first rib, second rib, third rib, fourth rib, fifth rib, sixth rib, seventh rib and eighth rib) show an example
  • the first rib 140a and the second rib 140b are connected at one end
  • the second rib 140b and the third rib 140c are connected at the other end
  • the second rib 140b is connected at the other end.
  • the third rib 140c and the fourth rib 140d are connected at one end
  • the fourth rib 140d and the fifth rib 140e are connected at the other end
  • the fifth rib 140e and the sixth rib (140e) are connected to each other.
  • 140f) is connected at one end
  • the seventh rib 140g and the eighth rib 140h are connected at the other end.
  • the separation distance between the first rib 140a and the second rib 140b, the separation distance between the second rib 140b and the third rib 140c, and the third rib 140c and the fourth rib 140d distance between the fourth rib 140d and the fifth rib 140e, the fifth rib 140e and the sixth rib 140f, the seventh rib 140g and the eighth rib 140h ) is configured to be the same.
  • the thickness of the ribs 140 may be the same (constant).
  • a rib block 145 is provided at an end of the rib 140 , and the rib block 145 is a medium connecting the rib and the rib 140 .
  • the rib block 145 is a medium connecting the rib and the rib 140 .
  • one end of the first rib 140a and one end of the second rib 140b are connected by a first rib block 145a, and the other end of the second rib 140b and the other end of the third rib 140c are connected.
  • the first rib block 145a, the third rib block 145c and the fifth rib block 145e are located at the left end of the porous ceramic foam, while the second rib block 145b and the fourth rib block 145d ) and the sixth rib block 145f is configured to be positioned at the right end of the porous ceramic foam.
  • the rib 140 and the rib block 145 are preferably made of the same material.
  • the empty space between the first rib 140a and the second rib 140b constitutes the first channel 150a
  • the empty space between the second rib 140b and the third rib 140c constitutes the second channel ( 150b)
  • the empty space between the third rib 140c and the fourth rib 140d constitutes the third channel 150c
  • the empty space between the fourth rib 140d and the fifth rib 140e The space constitutes the fourth channel 150d
  • the empty space between the fifth rib 140e and the sixth rib 140f constitutes the fifth channel 150e
  • the empty space between 140g constitutes the sixth channel 150f
  • the empty space between the seventh rib 140g and the eighth rib 140h constitutes the seventh channel 150g.
  • the porous ceramic foam including the ribs 140 arranged in a serpentine type and the channel 150 forming an empty space between the ribs and the ribs may be manufactured as follows.
  • a porous ceramic foam including ribs 140 arranged in a serpentine type and a channel 150 forming an empty space between the ribs and the ribs is a hydrophobic coating film to inhibit water droplets from forming on the surface.
  • a porous ceramic foam may be manufactured by coating the porous ceramic material with a hydrophobic material.
  • the hydrophobic coating film is preferably provided with a thickness of about 10 nm to 2 ⁇ m.
  • the porous ceramic foam including the ribs 140 arranged in a meandering shape and the channel 150 forming an empty space between the ribs and the ribs will be described.
  • a porous polymer foam (eg, polyurethane foam) is used as a substrate to prepare the porous ceramic foam.
  • the polymer foam is a porous material having elasticity, such as a sponge.
  • the porosity, pore size, etc. of the polymer foam affect the porosity, pore size, etc. of the porous ceramic foam to be manufactured later.
  • a polymer foam is prepared corresponding to the shape of the porous ceramic foam to be manufactured.
  • the polymer foam is manufactured to have a structure including ribs arranged in a serpentine type as shown in FIGS. 8 and 9 and a channel forming an empty space between the ribs and the ribs.
  • the manufacture of the polymer foam may use injection molding, etc.
  • a starting material including a ceramic raw material, a binder and a solvent is prepared.
  • a subsequent process proceeds in the same manner as described in Example 1 to form a porous ceramic foam.
  • the porous ceramic foam thus prepared is a porous body having countless pores.
  • the porous ceramic foam includes pores (cells) serving as passageways through which fine dust flows, and a wall forming a strut of the porous ceramic foam between the pores (cells), FIG. and ribs 140 arranged in a serpentine type as shown in FIG. 9 , and a channel 150 forming an empty space between the ribs and the ribs.
  • a whisker may be formed in the porous ceramic foam including the ribs 140 arranged in a serpentine type and the channel 150 forming an empty space between the ribs and the ribs. More specifically, the porous ceramic foam has pores (cells) serving as passageways for fine dust to flow in, and a wall forming a strut of the porous ceramic foam between the pores (cells). It also includes ribs 140 arranged in a serpentine type, and a channel 150 forming an empty space between the ribs and the ribs, and a plurality of whiskers have pores (cells) on the surface of the wall. cell)) may protrude toward the
  • the whisker may be made of at least one needle-shaped ceramic material selected from the group consisting of mullite (3Al 2 O 3 ⁇ 2SiO 2 ), ZnO, and silicon carbide (SiC).
  • a plurality of whiskers protrude from the surface of the wall toward the pores (cells), thereby maximizing the filtering effect of fine dust.
  • the whisker serves to effectively collect fine dust while suppressing an increase in differential pressure during filtering.
  • a porous polymer foam (more specifically, polyurethane foam) was used as a substrate to prepare the porous ceramic foam.
  • the polymer foam is a porous material having elasticity, such as a sponge.
  • Polymer foam was cut to fit the size of the specimen to be fabricated, washed through ultrasonic cleaning, and then dried in an oven at 70° C. for 24 hours.
  • FIG. 12 is a photograph showing a polyurethane foam used as a polymer foam in Experimental Example 1. Referring to Figure 10, it can be seen that the polyurethane foam has a porous sponge shape.
  • the solute and the solvent were prepared, and the ratio of the solute and the solvent was measured in a weight ratio of 50:50.
  • alumina powder and glass frit were used as the solute.
  • Alumina powder and glass frit were used in a weight ratio of 47.5:2.5.
  • the alumina powder is the main material of the porous ceramic foam (ceramic porous body) to be produced, and the glass frit not only serves to lower the sintering temperature and contains Si in the porous ceramic foam itself, but also to increase the growth of mullite. can play a role in improving it. Distilled water was used as the solvent.
  • a dispersant BYK-111
  • alumina powder which is the main material
  • alumina powder which is the main material
  • a glass frit was added to the solvent in which the alumina powder is dispersed and stirring for 1 hour
  • PVA solution Polyvinyl alcohol solution
  • As the PVA solution a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used. The PVA solution serves to improve the adhesion of the ceramic slurry.
  • the ceramic slurry was dip-coated on a polymer foam.
  • the polymer foam was completely immersed in the ceramic slurry, and dip coating was performed in a vacuum atmosphere for 5 minutes. After dip coating, the polymer foam was compressed to less than 2/3 of the thickness of the polymer foam by applying an external force to remove the excess slurry contained in the polymer foam, and then released to return to the original polymer foam form. Some of the slurry contained in the polymer was allowed to escape from the polymer foam.
  • the dip-coated polymer foam was dried in an oven at a temperature of 80° C. for 3 hours.
  • 13 is a photograph showing a state in which a ceramic slurry is dip-coated on a polymer foam and dried.
  • the dip-coated polymer foam was sintered.
  • the polymer foam was charged into a furnace, and the temperature was raised to 550°C at a rate of 5°C per minute, and then maintained at 550°C for 1 hour so that the polymer component was burned and removed, at a rate of 5°C per minute. After raising the temperature to 1450°C, it was maintained at 1450°C for 3 hours for sintering, followed by furnace cooling to obtain a porous ceramic foam. The sintering was performed in an air atmosphere. The porous ceramic foam thus prepared is shown in FIG. 14 .
  • the porous ceramic foam is a porous body having countless pores.
  • the porous ceramic foam prepared according to Experimental Example 1 was immersed in ethanol and ultrasonically washed, and then dried in an oven at a temperature of 75° C. for 24 hours.
  • the solute and the solvent were prepared, and the ratio of the solute and the solvent was measured at a weight ratio of 34.66:65.34.
  • Mullite powder, AlF 3 powder and silica sol were used as the solute.
  • the mullite powder, the AlF 3 powder, and the silica sol were used in a weight ratio of 13.33:13.33:8.
  • the mullite powder serves as a seed of mullite crystal growth
  • the AlF 3 powder serves as a source of Al and F ions
  • the silica sol serves as a source of Si ions. Distilled water was used as the solvent.
  • a dispersant BYK-111
  • silica sol was slowly added and stirred for 30 minutes.
  • AlF 3 powder was added to the silica sol-added solvent and stirred for 1 hour.
  • Mullite powder was added to the AlF 3 powder-added solvent and stirred for 1 hour.
  • a CMC (Carboxylic methyl cellulose) solution as a thickener is added to a solvent to which mullite powder is added based on 100 parts by weight of the solute and stirred for 30 minutes, and then a PVA solution as a binder is added to 100 parts by weight of the solute by 5 parts by weight. After addition, the mixture was stirred for 1 hour to form a ceramic slurry.
  • a CMC solution a solution in which Carboxylic methyl cellulose (CMC) was dissolved in distilled water at 0.1 wt% was used.
  • the CMC solution serves to increase the viscosity of the coating solution to decrease the precipitation rate.
  • PVA solution a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used.
  • the PVA solution serves to improve the adhesion of the ceramic slurry.
  • the ceramic slurry was dip-coated on the porous ceramic foam prepared according to Experimental Example 1.
  • the porous ceramic foam was completely immersed in the ceramic slurry, and dip coating was performed in a vacuum atmosphere for 5 minutes.
  • the dip-coated porous ceramic foam was dried in an oven at a temperature of 80° C. for 3 hours.
  • a porous ceramic foam with dip coating was sintered.
  • the porous ceramic foam was charged into a furnace, and the temperature was raised to 1400° C. at a rate of 5° C. per minute, maintained at 1400° C. for 3 hours, and sintered, followed by furnace cooling to obtain a whisker-formed porous ceramic foam.
  • the sintering was performed in an air atmosphere.
  • a porous ceramic foam having whiskers according to Experimental Example 2 is shown in FIG. 18 .
  • the porous ceramic foam is a porous body having innumerable pores.
  • the whiskers are formed on the porous ceramic foam.
  • the porous ceramic foam prepared according to Experimental Example 1 was immersed in ethanol and ultrasonically washed, and then dried in an oven at a temperature of 75° C. for 24 hours.
  • the solute and the solvent were prepared, and the ratio of the solute and the solvent was measured in a weight ratio of 20:80.
  • alumina powder which is the same material as alumina, which is the main component of the porous ceramic foam, was used.
  • a dispersant (Darvan C) was added based on 100 parts by weight of the solute while stirring using a magnetic bar. After the dispersant was added and stirred for 1 hour, alumina powder was added and stirred for 1 hour.
  • a ceramic slurry was formed by adding 50 parts by weight of a PVA solution as a binder to a solvent to which alumina powder was added based on 100 parts by weight of the solute and stirring for 1 hour.
  • a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used. The PVA solution serves to improve the adhesion of the ceramic slurry.
  • the ceramic slurry was coated on the surface of the porous ceramic foam prepared according to Experimental Example 1.
  • the coating was selectively carried out by immersing only the tip (surface) of the porous ceramic foam to be coated and then taking it out, rather than completely immersing the porous ceramic foam in the ceramic slurry.
  • the slurry is coated only to a certain depth from the surface of the porous ceramic foam, and the portion coated with the slurry is uncoated.
  • the pores (pores of the first size) having a relatively smaller size than the portion are distributed.
  • the portion on which the slurry is not coated becomes a region (second region) of the porous ceramic foam having relatively large-sized pores (pores of the second size), and the portion coated with the slurry has relatively small-sized pores A region (a first region) of the porous ceramic foam having (pores of a first size).
  • the porous ceramic foam with the selective coating was dried in an oven at a temperature of 80° C. for 3 hours.
  • a porous ceramic foam with selective coating was sintered.
  • a porous ceramic foam with selective coating was charged into a furnace, and the temperature was raised to 550°C at a rate of 5°C per minute, and then maintained at 550°C for 1 hour so that the polymer component was burned and removed. After raising the temperature to 1250°C at a rate of 5°C, it was maintained at 1250°C for 3 hours for sintering, and then furnace-cooled to obtain a porous ceramic foam. The sintering was performed in an air atmosphere.
  • the porous ceramic foam prepared in this way is relatively large compared to the first region (A) and the first region (A) having pores (pores of the first size) having a relatively small size compared to the second region (B). and a second region B having pores of a size (pores of a second size).
  • a porous polymer foam (more specifically, polyurethane foam) as a substrate to produce a porous ceramic foam including the first region (A) and the second region (B) 2 dog was used.
  • Two polymer foams (the first polymer foam and the second polymer foam) were used to have different pore sizes (PPI; Pore per inch), for example, the average pore size of the first polymer foam is the average pore size of the second polymer foam A smaller size was used.
  • the first and second polymer foams are porous materials having elasticity, such as a sponge. The first and second polymer foams were cut to fit the size of the specimen to be manufactured, and then washed through ultrasonic cleaning, and then dried in an oven at 70° C. for 24 hours.
  • the solute and the solvent were prepared, and the ratio of the solute and the solvent was measured in a weight ratio of 50:50.
  • alumina powder and glass frit were used as the solute.
  • Alumina powder and glass frit were used in a weight ratio of 47.5:2.5.
  • the alumina powder is the main material of the porous ceramic foam (ceramic porous body) to be produced, and the glass frit not only serves to lower the sintering temperature and contains Si in the porous ceramic foam itself, but also to increase the growth of mullite. can play a role in improving it. Distilled water was used as the solvent.
  • a dispersant BYK-111
  • alumina powder which is the main material
  • alumina powder which is the main material
  • a glass frit was added to the solvent in which the alumina powder is dispersed and stirring for 1 hour
  • PVA solution Polyvinyl alcohol solution
  • As the PVA solution a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used. The PVA solution serves to improve the adhesion of the ceramic slurry.
  • the ceramic slurry was dip-coated on the first and second polymer foams.
  • the first and second polymer foams were completely immersed in the ceramic slurry, and dip coating was performed in a vacuum atmosphere for 5 minutes. After dip coating, compressing to 2/3 or less of the thickness of the first and second polymer foams by applying an external force to remove the excess slurry contained in the first and second polymer foams, and then releasing the compression to restore the original polymer foam form Some of the slurry contained in the first and second polymer foams was released from the first and second polymer foams in this way.
  • the first polymer foam coated with the dip coating and the second polymer foam coated with the dip coating were overlapped, and dried in an overlapping state at a temperature of 80° C. for 3 hours.
  • the first polymer foam and the second polymer foam were overlapped and the dried product was sintered.
  • the resultant is charged into a furnace, heated to 550° C. at a rate of 5° C. per minute, and maintained at 550° C. for 1 hour to form a polymer component This was burned to be removed, and the temperature was raised to 1450°C at a rate of 5°C per minute, maintained at 1450°C for 3 hours, and sintered, followed by furnace cooling to obtain a porous ceramic foam.
  • the sintering was performed in an air atmosphere.
  • a porous ceramic foam consisting of a single body is formed.
  • the first polymer foam and the second polymer foam were used to have different pore sizes (PPI; Pore per inch), and the region where the first polymer foam was positioned and the region where the second polymer foam was positioned had different pore sizes. Accordingly, the region (the first region) having pores (pores of the first size) having a relatively small size compared to the second region and pores having a relatively large size (second size) compared to the first region A porous ceramic foam in which the region (the second region) having the pores) is separated can be obtained.
  • the porous ceramic foam prepared according to Experimental Example 1 was immersed in ethanol and ultrasonically washed, and then dried in an oven at a temperature of 75° C. for 24 hours.
  • zinc nitrate hexahydrate After adding ethanol as a solvent to a beaker, zinc nitrate hexahydrate was added and stirred for 1 hour to form a seed solution. The zinc nitrate hexahydrate was added so that the zinc nitrate hexahydrate and ethanol had a weight ratio of 6:94.
  • the zinc nitrate hexahydrate (Zn(NO 3 ) 2 ⁇ 6H 2 O) serves as a source of Zn.
  • the seed solution was dip-coated on the polymer foam prepared according to Experimental Example 1.
  • the porous ceramic foam was completely immersed in the seed solution, and dip coating was performed in a vacuum atmosphere for 20 minutes.
  • the porous ceramic foam with dip coating was annealed in an oven at a temperature of 200° C. for 3 hours. By the annealing, the seed solution may be well adhered to the porous ceramic foam.
  • a PVA solution was added thereto, followed by stirring for 1 hour to form a growth solution.
  • the zinc nitrate hexahydrate and hexamethylenetetramine powder were added so that zinc nitrate hexahydrate, hexamethylenetetramine powder and ethanol were in a weight ratio of 0.004:0.002:99.994.
  • the zinc nitrate hexahydrate serves as a source of Zn
  • the hexamethylenetetramine powder serves as a source of Al and F.
  • As the PVA solution a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used. The PVA solution serves to improve the adhesion of the growth solution.
  • the annealed porous ceramic foam was immersed in the growth solution and coated.
  • the temperature of the growth solution was brought to 95° C., and the porous ceramic foam was immersed and coated for 24 hours.
  • the porous ceramic foam coated with the growth solution was placed in a beaker containing distilled water and washed by shaking slowly.
  • the washed porous ceramic foam was sintered.
  • the porous ceramic foam was charged into a furnace, and the temperature was raised to 1200°C at a rate of 5°C per minute, maintained at 1200°C for 1 hour and sintered, and then furnace cooled to obtain a porous ceramic foam having a whisker made of ZnO. .
  • the sintering was performed in an air atmosphere.
  • a porous polymer foam (more specifically, polyurethane foam) was used as a substrate to prepare the porous ceramic foam.
  • the polymer foam is a porous material having elasticity, such as a sponge.
  • Polymer foam was cut to fit the size of the specimen to be fabricated, washed through ultrasonic cleaning, and then dried in an oven at 70° C. for 24 hours.
  • the solute and the solvent were prepared, and the ratio of the solute and the solvent was measured in a weight ratio of 50:50.
  • Silicon carbide powder and glass frit were used as the solute.
  • Silicon carbide powder and glass frit were used in a weight ratio of 47.5:2.5.
  • the silicon carbide powder is the main material of the porous ceramic foam (ceramic porous body) to be produced, and the glass frit not only serves to lower the sintering temperature and contains Si in the porous ceramic foam itself, but also improves the growth of SiC. can play a role Distilled water was used as the solvent.
  • a dispersant BYK-111
  • silicon carbide powder as the main material was added to the solvent and stirred for 1 hour.
  • a glass frit was added to the solvent in which the silicon carbide powder was dispersed and stirred for 1 hour, and then 5 parts by weight of a PVA (Polyvinyl alcohol) solution as a binder was added based on 100 parts by weight of the solute and stirred for 1 hour.
  • a ceramic slurry was formed.
  • the PVA solution a solution in which polyvinyl alcohol (PVA) having a molecular weight of about 89000 to 99000 was dissolved in distilled water was used. The PVA solution serves to improve the adhesion of the ceramic slurry.
  • the ceramic slurry was dip-coated on a polymer foam.
  • the polymer foam was completely immersed in the ceramic slurry, and dip coating was performed in a vacuum atmosphere for 5 minutes. After dip coating, the polymer foam was compressed to less than 2/3 of the thickness of the polymer foam by applying an external force to remove the excess slurry contained in the polymer foam, and then released to return to the original polymer foam form. Some of the slurry contained in the polymer was allowed to escape from the polymer foam.
  • the dip-coated polymer foam was dried in an oven at a temperature of 80° C. for 3 hours.
  • the dip-coated polymer foam was sintered.
  • the polymer foam was charged into a furnace, and the temperature was raised to 550°C at a rate of 5°C per minute, and then maintained at 550°C for 1 hour so that the polymer component was burned and removed, at a rate of 5°C per minute. After raising the temperature to 1450°C, it was maintained at 1450°C for 3 hours for sintering, followed by furnace cooling to obtain a porous ceramic foam. The sintering was performed in a reducing atmosphere.
  • the thus-prepared porous ceramic foam was soaked in ethanol for ultrasonic cleaning, and then dried in an oven at a temperature of 75° C. for 24 hours.
  • the dried porous ceramic foam was placed in the center of the tube, and at the entrance to the tube, silica powder and carbon powder to be used as a source for whisker growth were mounted on an alumina plate.
  • the silica powder and the carbon powder were in a weight ratio of 1:1.6.
  • Argon (Ar) was used as a carrier gas, and the flow rate of the carrier gas was 0.2 L/min.
  • the reaction temperature was set to 1450° C. and it was carried out for 4 hours to allow SiC whiskers to grow.
  • the present invention it is possible to efficiently collect fine dust generated by friction between the rotor and the brake pad in a brake device of a transportation engine, and has industrial applicability.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

La présente invention se rapporte à un appareil de collecte permettant de collecter des poussières fines générées par le frottement entre un rotor et un patin de frein dans un dispositif de freinage d'un moyen de transport, l'appareil comprenant : un premier collecteur comprenant une partie de la surface externe du rotor ; un collecteur supérieur comprenant une partie de la surface circonférentielle externe du rotor ; et un second collecteur comprenant une partie de la surface interne du rotor, le premier collecteur et le second collecteur étant constitués d'une mousse céramique poreuse. Selon la présente invention, les poussières fines générées par le frottement entre le rotor et le patin de frein dans le dispositif de freinage du moyen de transport peuvent être efficacement collectées et les poussières fines générées pendant le freinage du moyen de transport sont réduites de telle sorte que la pollution de l'air puisse être empêchée.
PCT/KR2021/007704 2020-12-29 2021-06-18 Appareil de collecte permettant de collecter des poussières fines générées à partir d'un dispositif de freinage de moyens de transport WO2022145599A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020200185420A KR102538298B1 (ko) 2020-12-29 2020-12-29 수송기관의 브레이크 장치에서 발생한 미세먼지를 포집하기 위한 포집장치 및 그 제조방법
KR10-2020-0185420 2020-12-29
JP2021-065727 2021-04-08
JP2021065727A JP7353321B2 (ja) 2020-12-29 2021-04-08 輸送機関のブレーキ装置で発生した微小粒子状物質を捕集するための捕集装置

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JP2003080080A (ja) * 2001-06-28 2003-03-18 Denso Corp セラミックフィルタおよび触媒付セラミックフィルタ
KR100522041B1 (ko) * 2003-03-19 2005-10-17 한국기계연구원 비표면적이 큰 다공성 재료의 제조방법
JP2007309406A (ja) * 2006-05-18 2007-11-29 Akebono Brake Ind Co Ltd 摩耗粉吸着手段を備えたディスクブレーキ
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KR100522041B1 (ko) * 2003-03-19 2005-10-17 한국기계연구원 비표면적이 큰 다공성 재료의 제조방법
JP2007309406A (ja) * 2006-05-18 2007-11-29 Akebono Brake Ind Co Ltd 摩耗粉吸着手段を備えたディスクブレーキ
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