WO2016136637A1 - Ceramic plate-shaped body and method for producing same - Google Patents
Ceramic plate-shaped body and method for producing same Download PDFInfo
- Publication number
- WO2016136637A1 WO2016136637A1 PCT/JP2016/054937 JP2016054937W WO2016136637A1 WO 2016136637 A1 WO2016136637 A1 WO 2016136637A1 JP 2016054937 W JP2016054937 W JP 2016054937W WO 2016136637 A1 WO2016136637 A1 WO 2016136637A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- region
- porosity
- ceramic plate
- ceramic
- plate
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/007—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore distribution, e.g. inhomogeneous distribution of pores
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/12—Travelling or movable supports or containers for the charge
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6023—Gel casting
Definitions
- the present invention relates to a ceramic plate-like body suitably used as a setter for an object to be fired and a method for producing the same.
- a setter also called a shelf board or a floor board
- firing ceramic electronic parts and glass it is common to place the object to be fired on a setter, also called a shelf board or a floor board, and perform firing.
- a setter also called a shelf board or a floor board
- the size of the mounting surface is increased, a temperature difference is likely to occur between the central area and the peripheral area of the mounting surface. Since the occurrence of the temperature difference may affect the quality of the fired product, such as warping of the fired product, it is desired to prevent the temperature difference from occurring on the mounting surface.
- Patent Document 1 describes a porous ceramic setter having excellent air permeability and high thermal conductivity.
- ceramic fibers or whiskers and ceramic particles selected from SiC, BN, AlN, BeO, MoSi 2 , TiN, and ZrB 2 having an average particle diameter of 5 to 100 ⁇ m are bonded with a heat-resistant inorganic binder. It has an entangled structure between fibers.
- Patent Document 2 includes a raw material containing ceramic powder and an organic compound or clay for imparting shape retention to the powder.
- a molding step for forming a molded product by using, a drying / firing step for drying the molded product at a temperature of 1300 to 1800 ° C. after drying the molded product, and a flat plate having a uniform thickness The manufacturing method of the ceramic board which has the cutting process cut
- Patent Documents 1 and 2 Even if the techniques described in Patent Documents 1 and 2 are adopted, it is not easy to reduce the temperature difference generated between the central area and the peripheral area of the setter mounting surface to a satisfactory level. In particular, it is not easy to reduce the temperature difference during heating or cooling in the firing process, particularly during rapid heating or rapid cooling.
- An object of the present invention is to provide a ceramic plate-like body suitably used as a setter, which can eliminate the various disadvantages of the above-described prior art.
- the present invention has a plate-like porous body portion made of ceramics, A first region having a first porosity when viewed in plan, and a second region having a second porosity that is lower than the first porosity; The first region and the second region provide a ceramic plate that is the same ceramic material.
- the present invention also provides a method for producing the ceramic plate-like body as described above. Placing the nesting member in the concave portion of the casting mold having a concave portion complementary to the target ceramic plate, In the recess, a first slurry containing a ceramic raw material powder and a gelling agent is supplied and gelled to form a first molded body, Supplying the second slurry containing the ceramic raw material powder and the gelling agent to the demolding space generated by demolding the nested member from the recess and then demolding the nested member; Freezing the first molded body and the second slurry supplied to the demolding space of the first molded body to obtain a frozen body, The frozen body is dried to obtain a dried body, And then subjecting the dried body to firing, The present invention provides a method for producing a ceramic plate-like body using the first and second slurries having different concentrations of the ceramic raw material powder contained therein.
- FIG. 1 is a perspective view showing an embodiment of a ceramic plate-like body of the present invention.
- 2 is a cross-sectional view taken along line II-II in FIG. 3A to 3C are process diagrams showing a preferred method for producing the ceramic plate-like body shown in FIG. 4 (a) to 4 (d) are process diagrams showing a preferred method for manufacturing the ceramic plate-like body shown in FIG. 1, following FIG. 3 (c).
- FIG. 5 is a scanning electron microscope image of the central region of the ceramic plate obtained in Example 1.
- 6 is a scanning electron microscope image of the peripheral area of the ceramic plate obtained in Example 1.
- FIG. FIG. 7 is a thermographic image when the ceramic plate obtained in Example 1 is heated and then rapidly cooled.
- FIG. 8 is a thermographic image when the ceramic plate obtained in Comparative Example 2 is heated and then rapidly cooled.
- FIG. 1 shows an embodiment of the ceramic plate-like body of the present invention.
- 2 is a cross-sectional view taken along line II-II in FIG.
- the ceramic plate-like body 10 shown in these drawings is used as a setter during firing of an object to be fired.
- the ceramic plate 10 has a plate-like main body 11.
- the main body 11 is made of a porous body made of ceramics.
- the main body 11 has a first surface 11a and a second surface 11b opposite to the first surface 11a.
- the main body 11 has a rectangular shape in plan view.
- the shape of the main body 11 in a plan view is not limited to a rectangle, and can take various shapes depending on the shape and number of objects to be fired. Whatever the shape of the main body 11 in plan view, the thickness of the main body 11 is preferably the same at an arbitrary position.
- the ceramic plate-like body 10 has leg portions 12 in addition to the main body portion 11.
- the legs 12 are provided at the corners of the main body 11.
- the main body portion 11 has a rectangular shape in plan view, and the leg portions 12 are located at the four corners of the main body portion 11.
- the leg portion 12 is suspended from the second surface 11b of the main body portion.
- the leg portion 12 is formed integrally with the main body portion 11. Further, the leg portion 12 is formed of the same ceramic material as that of the main body portion 11. However, it is not necessary that the leg portion 12 is a porous body.
- the first surface 11a of the main body 11 serves as a mounting surface for the material to be fired when the ceramic plate 10 is used, that is, when the material to be fired is fired.
- the first surface 11a is a flat surface. That is, the first surface 11a is a flat surface and not a curved surface.
- the first surface 11a is a smooth surface. That is, the first surface 11a is smooth, and there are no convex portions or concave portions. Since the first surface 11a is a flat and smooth surface as described above, the material to be fired can be stably placed on the first surface 11a when the material to be fired is fired. Calcination can be performed.
- the surface shape of the second surface 11b is not particularly limited.
- the main body 11 is made of a porous body, and the main body 11 has two regions having different porosity. Specifically, the main body 11 has a first region 21 having a first porosity when viewed in plan and a second region having a second porosity that is lower than the first porosity. Area 22.
- the porosity in the first region 21 and the porosity in the second region 22 change in a step shape. However, the boundary between the first region 21 and the second region 22 may not be clear, and the porosity may gradually decrease from the first region 21 to the second region 22.
- the boundary between the two regions is a portion having an average value of the porosity of the first region 21 and the porosity of the second region.
- the first region 21 and the second region 22 are preferably integrally formed. “Integrally formed” means that the first region 21 and the second region 22 are not joined by any joining means, but the two regions 21 and 22 are continuous structures as ceramics. It means being. According to a preferred manufacturing method described later, the ceramic plate 10 in which the first region 21 and the second region 22 are integrally formed can be manufactured. However, when another manufacturing method is employed, In some cases, the ceramic plate 10 in which the regions 21 and 22 are not integrally formed may be obtained.
- the first region 21 and the second region 22 are integrally formed, when the ceramic plate 10 is heated and / or cooled, the temperature difference between the central region and the peripheral region of the main body 10 is further increased. Since it can be made small, it is preferable.
- the main body 11 has a central area in a plan view and a peripheral area that surrounds the central area and includes the peripheral edge of the main body 11, and the central area is from one first area 21. It has become.
- the peripheral area is composed of the second area 22.
- the first region 21 located in the central region has a rectangular shape that is substantially similar to the shape of the main body 11 in a plan view of the main body 11.
- the shape of the first region 21 in plan view does not need to be similar to the shape of the main body portion 11 in plan view.
- the shape of the first region 21 in plan view need not be rectangular.
- the shape of the first region 21 in plan view may be a circle or a polygon other than a rectangle.
- the normal line drawn at an arbitrary position on the periphery of the first region 21 in plan view intersects with the peripheral edge of the main body 11.
- the length is preferably the same at any position on the periphery.
- the first region 21 is a circle and the second region 22 is a ring having the same inner diameter as the circle, and the circle of the first region 21 and the ring of the second region 22 are concentric. It is preferable.
- the length until the normal drawn to an arbitrary position on the periphery of the first region 21 in a plan view intersects with the peripheral edge of the main body 11 differs at any two or more positions on the periphery.
- the value of L max / L min which is the ratio of the longest length L max to the shortest length L min is preferably 8 or less, particularly 4 or less.
- the first region 21 has a constant porosity, that is, a first porosity throughout the entire thickness direction and in-plane direction.
- region 22 has a fixed porosity, ie, a 2nd porosity, throughout the thickness direction and the in-plane direction.
- the first region 21 and the second region 22 are made of the same ceramic material. Since both the regions 21 and 22 are made of the same ceramic material, the sense of unity between both the regions 21 and 22 is enhanced, which is advantageous in terms of maintaining strength and heat conduction. In particular, when both the regions 21 and 22 are integrally formed as described above, the sense of unity is further enhanced if both the regions 21 and 22 are made of the same ceramic material. As a result, the temperature difference between the central region and the peripheral region of the main body 10 can be further reduced when the ceramic plate 10 is heated and / or cooled.
- the central region of the main body 11 during heating and cooling in the firing process.
- the temperature difference between the peripheral region and the conventional setter can be made smaller.
- the first region 21 that is a high porosity region has a smaller heat capacity than the second region 22 that is a low porosity region.
- the ceramic plate-like body 10 is cooled so that the temperature in the central region is lower than the temperature in the peripheral region.
- the reason for this is as follows.
- the ceramic plate-like body 10 is used as a setter for an object to be fired, for example, the object to be fired is often placed in the center area of the setter.
- the cooling proceeds with respect to the sum of the heat capacity of the central area and the heat capacity of the fired product. Therefore, if the cooling proceeds so that the temperature in the central region is lower than the temperature in the peripheral region, the heat capacity of the fired product can be offset by the heat capacity in the peripheral region of the setter, and the cooling is performed quickly. Can do.
- the porosity of the first region 21 is preferably 50% or more and 99% or less, more preferably 60% or more and 90% or less, and 70% or more and 90%. % Or less is more preferable.
- the porosity of the second region 22 is lower than the porosity of the first region 21, it is preferably 0% or more and 70% or less, and more preferably 0% or more and 60% or less. More preferably, it is 0% or more and 50% or less.
- the porosity is a physical property value defined by the apparent porosity measured by the Archimedes method.
- the porosity of the first region 21 and the second region 22 of the main body 11 is measured by the following method.
- the main body 11 is processed with a cutter, and only the first region 21 and the second region 22 are separately taken out, and the apparent porosity is measured according to JIS R1634 (vacuum method).
- JIS R1634 vacuum method
- it is preferably 20% or more and 95% or less, more preferably 40% or more and 85% or less, and further preferably 50% or more and 70% or less.
- the proportion of the area S2 of the second region 22 in plan view is preferably 80% or less than 5% relative to the area S T of the main body portion 11 in a plan view, 60% less than 15% More preferably, it is 30% or more and 50% or less.
- first region 21 is formed in the central region of the main body 11, but instead of this, two or more first regions 21 are formed. You may form in the center area of the main-body part 11.
- FIG. two or more first regions 21 are partitioned by a third region (not shown).
- the third region has a lower porosity than the first region 21, but has a higher porosity than the second region 22.
- the third region may partition the first region 21 and the second region 22 in addition to partitioning between the adjacent first regions 21.
- the ceramic material constituting the ceramic plate 10 various materials can be used. Examples thereof include alumina, silicon carbide, silicon nitride, zirconia, mullite, magnesia, and titanium diboride.
- a casting mold 30 is prepared.
- the casting mold 30 has a substantially rectangular bottom surface 31 in plan view and four side surfaces 32 rising from the periphery of the bottom surface 31, and the top surface is open.
- the bottom surface 31 and the side surface 32 define a recess S that opens upward.
- the recess S has a shape complementary to the target ceramic plate 10.
- the core member 33 is placed on the bottom surface 31 in the recess S of the casting mold 30 as shown in FIG.
- the core member 33 has a rectangular parallelepiped shape.
- the core member 33 has the same shape as that of the first region 21 in the target ceramic plate 10 in plan view.
- the mounting position of the core member 33 on the bottom surface 31 is made to coincide with the intended formation region of the first region 21 in the target ceramic plate 10.
- the first slurry 41 is supplied into the recess S of the casting mold 30 as shown in FIG. 3 (c).
- the first slurry 41 contains ceramic raw material powder and a gelling agent as a medium.
- the first slurry 41 contains water or a water-soluble organic solvent as a medium.
- the ceramic raw material powder contained in the first slurry 41 is a raw material for the ceramic material constituting the second region 22 in the target ceramic plate 10.
- the particle size of the ceramic raw material powder is preferably 0.01 ⁇ m or more and 100 ⁇ m or less, expressed as a volume cumulative particle size D 50 at a cumulative volume of 50 vol% by a laser diffraction / scattering particle size distribution measurement method, and is 0.05 ⁇ m or more and 10 ⁇ m or less. More preferably, it is 0.1 ⁇ m or more and 5 ⁇ m or less.
- the concentration of the ceramic raw material powder contained in the first slurry 41 is related to the porosity of the second region 22 in the target ceramic plate 10. Specifically, the higher the concentration of the ceramic raw material powder contained in the first slurry, the lower the porosity of the second region 22. From this viewpoint, the concentration of the ceramic raw material powder contained in the first slurry 41 is preferably 17 parts by volume or more and 150 parts by volume or less, and 25 parts by volume or more and 150 parts by volume or less with respect to 100 parts by volume of the medium. More preferably, it is 33 volume parts or more and 150 volume parts or less.
- the kind and concentration of the gelling agent contained in the first slurry 41 are related to the degree of gelation of the first slurry 41 described later. From this viewpoint, the concentration of the gelling agent contained in the first slurry 41 is preferably 0.1 parts by mass or more and 10 parts by mass or less, and 0.5 parts by mass or more and 7 parts by mass with respect to 100 parts by mass of the medium. More preferably, it is 1 part by mass or more and 4 parts by mass or less.
- the gelling agent is used as a binder for bonding particles of ceramic raw material powder in a freeze-dried product obtained by freeze-drying described later.
- N-alkylamide polymers, N-isopropylacrylamide polymers, sulfomethylated acrylamide polymers, N-dimethylaminopropyl methacrylamide polymers, polyalkylacrylamide polymers are used as gelling agents.
- Molecule alginic acid, sodium alginate, ammonium alginate, polyethyleneimine, cellulose derivative system, polyacrylate, polyethylene glycol, polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, starch, gelatin, agar, pectin, glucomannan, xanthan gum , Locust bean gum, carrageenan gum, guar gum, gellan gum, lignin sulfonate, polyacrylamide, polyvinyl ester, isobutylene - it can be used maleic acid anhydride copolymers, vinyl acetate, epoxy resin, phenol resin and urethane resin. These gelling agents can be used individually by 1 type or in combination of 2 or more types.
- the gelling agent preferably has a weight average molecular weight in the range of 500 to 2,000,000, more preferably 2,000 to 1,500,000, and even more preferably 4,000 to 1,000,000.
- a dispersant for smoothly dispersing the ceramic raw material powder in the medium can be blended.
- the dispersant for example, polycarboxylic acid ammonium salt, polyacrylic acid ammonium salt, polyethyleneimine and the like can be used. It is preferable that the compounding quantity of a dispersing agent is 0.5 to 3 mass parts with respect to 100 mass parts of ceramic raw material powders.
- the slurry When the first slurry 41 is supplied into the recess S of the casting mold 30, the slurry is gelled. In order to gelate, for example, the slurry may be cooled. The cooling temperature can be set to, for example, 1 ° C. or more and 12 ° C. or less. By the gelation of the first slurry, the slurry acquires shape retention and the first molded body 41a is obtained.
- the core member 33 surrounded by the first molded body 41a is removed. Since the first molded body 41a has shape retention as described above, the shape of the first molded body 41a does not change even if the core member 33 is removed. As a result, a demolding space 43 is formed in the central region of the first molded body 41a by demolding.
- the demolding space 43 is a through hole, and the bottom surface 31 of the casting mold 30 is exposed at the bottom.
- the second slurry 42 is supplied to the demolding space 43 formed by demolding the core member 33.
- the second slurry 42 contains ceramic raw material powder and a gelling agent as a medium.
- the second slurry 42 contains water or a water-soluble organic solvent as a medium.
- the ceramic raw material powder contained in the second slurry 42 is a raw material for the ceramic material constituting the first region 21 in the target ceramic plate 10.
- This ceramic raw material powder is the same type as the ceramic raw material powder contained in the first slurry 41.
- the particle diameter of the ceramic raw material powder contained in the second slurry 42 may be the same as or different from the particle diameter of the ceramic raw material powder contained in the first slurry 41.
- the particle diameter of the ceramic raw material powder contained in the second slurry 42 is 0.1 ⁇ m or more and 100 ⁇ m or less in terms of a volume cumulative particle diameter D 50 at a cumulative volume of 50% by volume measured by a laser diffraction / scattering particle size distribution measurement method.
- it is 0.05 ⁇ m or more and 10 ⁇ m or less, and more preferably 0.1 ⁇ m or more and 1 ⁇ m or less.
- the concentration of the ceramic raw material powder contained in the second slurry 42 is related to the porosity of the first region 21 in the target ceramic plate 10. Specifically, the porosity of the first region 21 increases as the concentration of the ceramic raw material powder contained in the second slurry 42 decreases. In the ceramic plate 10 that is the object of this manufacturing method, since the porosity is different between the first region 21 and the second region 22, the concentration of the ceramic raw material powder contained in the second slurry 42 and By making the concentration of the ceramic raw material powder contained in the first slurry 41 different from each other, the intended first region 21 and second region 22 can be successfully formed.
- 1 part by volume with respect to 100 parts by volume of the medium is provided on the condition that the concentration of the ceramic raw material powder contained in the second slurry 42 is lower than the concentration of the ceramic raw material powder contained in the first slurry 41. It is preferably 33 parts by volume or less, more preferably 1 part by volume or more and 25 parts by volume or less, and still more preferably 1 part by volume or more and 18 parts by volume or less.
- the gelling agent contained in the second slurry 42 may be the same as or different from the gelling agent contained in the first slurry 41.
- the concentration of the gelling agent contained in the second slurry 42 is preferably 0.1 parts by mass or more and 10 parts by mass or less, and 0.5 parts by mass or more and 7 parts by mass or less with respect to 100 parts by mass of the medium. More preferably, the amount is 1 part by mass or more and 4 parts by mass or less.
- the amount of the second slurry 42 supplied into the demolding space 43 is preferably such that the liquid level of the second slurry 42 is at the same position as the upper surface of the first molded body 41a.
- the second slurry 42 may be gelled by cooling, or may be subjected to a lyophilization step without being gelled.
- freezing proceeds from one direction, ice crystals grow, and an oriented structure of the ceramic raw material powder in the first compact body 41a and the second slurry 42 is formed. That is, rearrangement of the ceramic raw material powder occurs.
- a known cooling device can be used for freezing.
- a method of bringing the lower surface of the casting mold 30 into contact with a solid such as a cooled metal plate, a method of immersing the casting mold 30 together in a cooled liquid, or the like can be used.
- a method of bringing the lower surface of the casting mold 30 into contact with a solid such as a cooled metal plate, a method of immersing the casting mold 30 together in a cooled liquid, or the like can be used.
- the freezing temperature in the freezing step is not limited as long as the water in the gel or slurry can be frozen to produce ice. Depending on the type of gelling agent, freezing at ⁇ 10 ° C. or higher may not occur due to interaction with water, so a freezing temperature of ⁇ 10 ° C. or lower is preferable. For example, it is preferable to use the above-described ethanol type freezer and immerse the casting mold 30 in ethanol cooled to ⁇ 15 ° C. to freeze in one direction from the bottom.
- the frozen body produced by freezing is taken out from the casting mold 30 and dried as shown in FIG.
- a drying method that prevents cracks by gradually replacing ice with pores while suppressing a difference in drying speed between the inside and outside of the frozen body.
- ice can be replaced with pores by freeze-drying the frozen body, or by immersing in a water-soluble organic solvent or a water-soluble organic solvent aqueous solution and air-drying.
- the frozen body is immersed in a water-soluble organic solvent or a water-soluble organic solvent aqueous solution, the ice in the frozen body is melted and mixed with the water-soluble organic solvent.
- the portion that was ice in the frozen body is replaced with a water-soluble organic solvent. Thereafter, when the frozen body in which the inside of the frozen body is replaced with a water-soluble organic solvent is dried in the atmosphere or under reduced pressure, the portion that was ice in the freezing step is replaced with pores.
- a water-soluble organic solvent that does not erode the gelling agent and has higher volatility than water is used.
- Specific examples include, but are not limited to, methanol, ethanol, isopropyl alcohol, acetone, and ethyl acetate.
- the dried body 44 generated by drying is subjected to a firing step.
- the target ceramic plate 10 is obtained by this firing. Baking can generally be performed in air.
- the firing temperature may be selected appropriately depending on the type of ceramic raw material powder. The same applies to the firing temperature.
- the target ceramic plate 10 is obtained by the above method.
- the ceramic plate-like body 10 can be suitably used as a setter for firing ceramic products such as a shelf board and a floor board, and can also be used as a kiln tool other than a setter, such as a firewood or a beam. Furthermore, it can also be used for applications other than kiln tools, such as various jigs and various structural materials.
- the porosity of the central region of the plate-shaped main body 11 is set higher than the porosity of the peripheral region, but the first region 21 with a high porosity and the second region 22 with a low porosity
- the arrangement position is not limited to this.
- the first region 21 having a high porosity is arranged in the peripheral region of the plate-like body, and the second region 22 having a low porosity is arranged in the center of the plate-like body. It can also be placed in the area.
- region 22 with a low porosity may be arrange
- part means “part by mass”.
- Example 1 A ceramic plate 10 shown in FIGS. 1 and 2 was manufactured according to the method shown in FIGS. Water, alumina particles and a dispersing agent are mixed for 1 minute using a hybrid mixer. Separately from this, an aqueous solution in which gelatin as a gelling agent is dissolved in hot water is prepared, and both are mixed to form the first A slurry 41 was obtained.
- First slurry 41 obtained in this manner comprises alumina particles D 50 is 0.5 [mu] m, a water slurry further containing gelatin and a dispersing agent.
- the composition of this slurry is shown in Table 1 below. The amount of alumina particles relative to 100 parts by volume of water in the slurry was 43 parts by volume.
- Second slurry 42 obtained in this manner comprises alumina particles D 50 is 0.5 [mu] m, a water slurry further containing gelatin and a dispersing agent.
- the composition of this slurry is shown in Table 1 below. The amount of alumina particles relative to 100 parts by volume of water in the slurry was 11 parts by volume.
- the casting mold 30 As the casting mold 30, a mold having a square shape in plan view was used.
- the dimension of the casting mold 30 in plan view was 130 mm ⁇ 130 mm.
- a rectangular parallelepiped core member 33 is arranged in the central region of the concave portion S of the casting mold 30, and the first slurry 41 is supplied under this state.
- the core member 33 had a rectangular shape of 96.4 mm ⁇ 96.4 mm in plan view.
- the supply amount of the first slurry 41 was set so that the depth in the recess S was 5 mm.
- the casting mold 30 was left in the refrigerator, and the first slurry 41 was cooled and gelled to obtain a first molded body 41a.
- the core member 33 was demolded, and the second slurry 42 was supplied into the demolding space 43 generated by the demolding.
- the supply amount of the second slurry 42 was set such that the upper surface of the first molded body 41a and the liquid surface of the second slurry 42 coincided.
- the casting mold 30 was frozen at ⁇ 10 ° C. using ethanol.
- the obtained frozen body was taken out from the casting mold 30 and dried for 24 hours with a vacuum freeze-drying apparatus (FDU-1100 manufactured by Tokyo Science Instrument Co., Ltd.).
- the dried body thus obtained was calcined at 1600 ° C. for 7 hours in the air.
- the fired product was polished on both sides, and the thickness of the main body 11 was set to 2 mm.
- a target ceramic plate 10 was obtained.
- the porosity of the central region of the main body 11 was 80%, and the porosity of the peripheral region was 25%.
- the main body 11 was composed of a first region 21 and a second region 22.
- the proportion of the sum S1 of the area of the first region 21 to the area S T of the main body portion 11 in plan view are as shown in Table 2.
- FIG. 5 shows a scanning electron micrograph of the central region of the ceramic plate of Example 1
- FIG. 6 shows a scanning electron micrograph of the peripheral region of the ceramic plate of Example 1. Comparison of these scanning electron micrographs also shows that the central region has more voids than the peripheral region, and has a higher porosity than the peripheral region.
- Example 2 In Example 1, the core member 33 having a rectangular shape of 111.7 mm ⁇ 111.7 mm in plan view was used. Except for this, a ceramic plate 10 was obtained in the same manner as in Example 1.
- the main body 11 was composed of a first region 21 and a second region 22. The proportion of the sum S1 of the area of the first region 21 to the area S T of the main body portion 11 in plan view are as shown in Table 2.
- Example 3 In Example 1, the first and second slurries having the compositions shown in Table 1 below were used. Further, the core member 33 having a rectangular shape of 124.5 mm ⁇ 124.5 mm in plan view was used. Except for this, a ceramic plate 10 was obtained in the same manner as in Example 1.
- the main body 11 was composed of a first region 21 and a second region 22.
- the proportion of the sum S1 of the area of the first region 21 to the area S T of the main body portion 11 in plan view are as shown in Table 2.
- the amount of alumina particles relative to 100 parts by volume of water in the first slurry was 25 parts by volume.
- the amount of alumina particles relative to 100 parts by volume of water in the second slurry was 11 parts by volume.
- Example 1 In Example 1, only the second slurry 42 was used, and the core member 33 was not used. A ceramic plate was obtained in the same manner as in Example 1 except for this. The porosity of the main body 11 in this ceramic plate was 80%.
- the ceramic plate 10 obtained in Example 1 was a ceramic plate of the comparative example because the porosity was different between the central region and the peripheral region. It can be seen that the temperature difference between the central region and the peripheral region is smaller than that in FIG. Moreover, it turns out that it cools in a short time.
- the temperature in the central region is lower than that in the peripheral region, and when the object to be fired is placed in the central region and fired, the peripheral region and the central region It can be seen that the amount of heat is easily offset.
- the temperature in the peripheral region is lower than that in the central region and the temperature difference is large, whereas in Example 1 in FIG. It can be seen that the temperature is slightly higher than the temperature in the central region and the temperature difference is small.
- the plate-like body is made of ceramics, the plate-like body can be used in a harsh environment, and the porosity of a part of the plate-like body is compared with other parts.
- the advantage resulting from the higher or lower height can be utilized in harsh environments.
- a ceramic plate-like body that hardly causes a temperature difference between the central region and the peripheral region during heating and cooling, particularly during rapid heating and rapid cooling.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Finishing Walls (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
平面視したときに第1の気孔率を有する第1領域と、第1の気孔率よりも低い気孔率である第2の気孔率を有する第2の領域とを有し、
第1領域と第2領域とは同一のセラミックス素材である、セラミックス板状体を提供するものである。 The present invention has a plate-like porous body portion made of ceramics,
A first region having a first porosity when viewed in plan, and a second region having a second porosity that is lower than the first porosity;
The first region and the second region provide a ceramic plate that is the same ceramic material.
目的とするセラミックス板状体と相補形状の凹部を有する鋳込み用型における該凹部内に入れ子部材を配置し、
前記凹部内に、セラミックス原料粉及びゲル化剤を含む第1のスラリーを供給してゲル化させて第1の成形体を形成し、
前記入れ子部材を前記凹部内から脱型し、次いで該入れ子部材の脱型によって生じた脱型空間に、前記セラミックス原料粉及びゲル化剤を含む第2のスラリーを供給し、
第1の成形体、及び該第1の成形体の脱型空間に供給された第2のスラリーの凍結を行い、凍結体を得、
凍結体を乾燥させて乾燥体を得、
次いで乾燥体を焼成に付す、工程を有し、
第1及び第2のスラリーとして、それらに含まれる前記セラミックス原料粉の濃度が互いに相違するものを用いる、セラミックス板状体の製造方法を提供するものである。 The present invention also provides a method for producing the ceramic plate-like body as described above.
Placing the nesting member in the concave portion of the casting mold having a concave portion complementary to the target ceramic plate,
In the recess, a first slurry containing a ceramic raw material powder and a gelling agent is supplied and gelled to form a first molded body,
Supplying the second slurry containing the ceramic raw material powder and the gelling agent to the demolding space generated by demolding the nested member from the recess and then demolding the nested member;
Freezing the first molded body and the second slurry supplied to the demolding space of the first molded body to obtain a frozen body,
The frozen body is dried to obtain a dried body,
And then subjecting the dried body to firing,
The present invention provides a method for producing a ceramic plate-like body using the first and second slurries having different concentrations of the ceramic raw material powder contained therein.
図1及び図2に示すセラミックス板状体10を、図3及び図4に示す方法に従って製造した。水、アルミナ粒子及び分散剤を、ハイブリッドミキサーを用いて1分間混合し、これとは別に、ゲル化剤としてのゼラチンを湯に溶解させた水溶液を調製し、両者を混合することで第1のスラリー41を得た。このようにして得られた第1のスラリー41は、D50が0.5μmであるアルミナ粒子を含み、更にゼラチン及び分散剤を含む水スラリーである。このスラリーの組成を以下の表1に示す。スラリー中の水100体積部に対するアルミナ粒子の量は43体積部であった。 [Example 1]
A
実施例1において、中子部材33として、平面視して111.7mm×111.7mmの矩形状を有するものを用いた。これ以外は実施例1と同様にして、セラミックス板状体10を得た。本体部11は、第1領域21と第2領域22とから構成されていた。平面視における本体部11の面積STに対する第1領域21の面積の総和S1の割合は表2に示すとおりであった。 [Example 2]
In Example 1, the
実施例1において、第1及び第2のスラリーとして、以下の表1に示す組成のものを用いた。また、中子部材33として、平面視して124.5mm×124.5mmの矩形状を有するものを用いた。これ以外は実施例1と同様にして、セラミックス板状体10を得た。本体部11は、第1領域21と第2領域22とから構成されていた。平面視における本体部11の面積STに対する第1領域21の面積の総和S1の割合は表2に示すとおりであった。第1のスラリー中の水100体積部に対するアルミナ粒子の量は25体積部であった。第2のスラリー中の水100体積部に対するアルミナ粒子の量は11体積部であった。 Example 3
In Example 1, the first and second slurries having the compositions shown in Table 1 below were used. Further, the
実施例1において、第2のスラリー42のみを用い、且つ中子部材33を用いなかった。これ以外は実施例1と同様にしてセラミックス板状体を得た。このセラミックス板状体における本体部11の気孔率は80%であった。 [Comparative Example 1]
In Example 1, only the
電融アルミナ40部、電融ムライト30部、ローソーダ仮焼アルミナ30部、適量の有機系バインダー、及び液体バインダーを混合して混合物を得た。この混合物を混練し、乾燥し、プレス成形して成形体を得た。この成形体を1750℃で大気焼成して、耐火物板状体を得た。この耐火物板状体における本体部11の気孔率は17%であった。本体部11の厚みは5mmであった。 [Comparative Example 2]
A mixture was obtained by mixing 40 parts of electrofused alumina, 30 parts of electrofused mullite, 30 parts of calcined alumina, an appropriate amount of an organic binder, and a liquid binder. This mixture was kneaded, dried, and press molded to obtain a molded body. This molded body was fired in the atmosphere at 1750 ° C. to obtain a refractory plate-like body. The porosity of the
実施例及び比較例で得られたセラミックス板状体を加熱した。加熱は、板状体の中央部の温度が500℃になるように行った。この温度に加熱されたセラミックス板状体を、加熱炉から大気中に取り出し急冷を行った。板状体の中央部の温度が約400℃に冷却されるまでの時間を測定した。また、板状体の中央部の温度が約400℃になったときの、該板状体の周縁部における最低温度を測定した。温度の測定は、サーモグラフィー((株)チノー製CPA-640A)を用いて行った。その結果を以下の表2に示す。また測定した温度分布をサーモグラフィーにより彩色した外観写真として、実施例1について撮影したものを図7に示し、また比較例2について撮影したものを図8に示す。 [Evaluation]
The ceramic plate obtained in Examples and Comparative Examples was heated. Heating was performed so that the temperature at the center of the plate-like body was 500 ° C. The ceramic plate-like body heated to this temperature was taken out of the heating furnace into the atmosphere and rapidly cooled. The time until the temperature of the central part of the plate-like body was cooled to about 400 ° C. was measured. Moreover, the minimum temperature in the peripheral part of this plate-shaped object when the temperature of the center part of a plate-shaped object became about 400 degreeC was measured. The temperature was measured using a thermography (CPA-640A manufactured by Chino Co., Ltd.). The results are shown in Table 2 below. Moreover, what was image | photographed about Example 1 is shown in FIG. 7, and what was image | photographed about the comparative example 2 is shown in FIG. 8 as an external appearance photograph which colored the measured temperature distribution by thermography.
Claims (8)
- セラミックスから構成される板状の多孔体の部位を有し、
平面視したときに第1の気孔率を有する第1領域と、第1の気孔率よりも低い気孔率である第2の気孔率を有する第2の領域とを有し、
第1領域と第2領域とは同一のセラミックス素材である、セラミックス板状体。 It has a plate-shaped porous body made of ceramics,
A first region having a first porosity when viewed in plan, and a second region having a second porosity that is lower than the first porosity;
A ceramic plate-like body in which the first region and the second region are the same ceramic material. - 第1領域と第2領域とが一体として形成されている請求項1に記載のセラミックス板状体。 The ceramic plate-like body according to claim 1, wherein the first region and the second region are integrally formed.
- 平面視において中央域と、該中央域を囲繞し且つ前記板状体の周縁端を含む領域である周縁域とを有し、
前記中央域が1つ又は複数の第1領域からなり、前記周縁域が第2領域からなる請求項1又は2に記載のセラミックス板状体。 A central area in a plan view, and a peripheral area that surrounds the central area and includes a peripheral edge of the plate-like body;
The ceramic plate-like body according to claim 1 or 2, wherein the central region is composed of one or a plurality of first regions, and the peripheral region is composed of a second region. - 前記中央域が1つの第1領域からなり、
第1領域が第2領域からなる前記周縁域によって囲繞されている請求項2に記載のセラミックス板状体。 The central area consists of one first area,
The ceramic plate-like body according to claim 2, wherein the first region is surrounded by the peripheral region composed of the second region. - 第1領域の気孔率が50%以上99%以下であり、
第2領域の気孔率が、第1領域の気孔率よりも低いことを条件として、0%以上70%以下である請求項1ないし4のいずれか一項に記載のセラミックス板状体。 The porosity of the first region is 50% or more and 99% or less,
The ceramic plate-like body according to any one of claims 1 to 4, which has a porosity of 0% or more and 70% or less on the condition that the porosity of the second region is lower than the porosity of the first region. - 平面視における第1領域の面積の総和の割合が、前記板状体の面積に対して20%以上95%以下であり、
平面視における第2領域の面積の割合が、前記板状体の面積に対して5%以上80%以下である請求項1ないし5のいずれか一項のセラミックス板状体。 The ratio of the total area of the first regions in plan view is 20% to 95% with respect to the area of the plate-like body,
6. The ceramic plate according to claim 1, wherein a ratio of the area of the second region in a plan view is 5% or more and 80% or less with respect to the area of the plate. - セラミックス製品の焼成用セッターとして用いられる請求項1ないし6のいずれか一項に記載のセラミックス板状体。 The ceramic plate-like body according to any one of claims 1 to 6, which is used as a setter for firing ceramic products.
- 請求項1に記載のセラミックス板状体の製造方法であって、
目的とするセラミックス板状体と相補形状の凹部を有する鋳込み用型における該凹部内に入れ子部材を配置し、
前記凹部内に、セラミックス原料粉及びゲル化剤を含む第1のスラリーを供給してゲル化させて第1の成形体を形成し、
前記入れ子部材を前記凹部内から脱型し、次いで該入れ子部材の脱型によって生じた脱型空間に、前記セラミックス原料粉及びゲル化剤を含む第2のスラリーを供給し、
第1の成形体、及び該第1の成形体の脱型空間に供給された第2のスラリーの凍結を行い、凍結体を得、
凍結体を乾燥させて乾燥体を得、
次いで乾燥体を焼成に付す、工程を有し、
第1及び第2のスラリーとして、それらに含まれる前記セラミックス原料粉の濃度が互いに相違するものを用いる、セラミックス板状体の製造方法。 It is a manufacturing method of the ceramic plate-like object according to claim 1,
Placing the nesting member in the concave portion of the casting mold having a concave portion complementary to the target ceramic plate,
In the recess, a first slurry containing a ceramic raw material powder and a gelling agent is supplied and gelled to form a first molded body,
Supplying the second slurry containing the ceramic raw material powder and the gelling agent to the demolding space generated by demolding the nested member from the recess and then demolding the nested member;
Freezing the first molded body and the second slurry supplied to the demolding space of the first molded body to obtain a frozen body,
The frozen body is dried to obtain a dried body,
And then subjecting the dried body to firing,
The manufacturing method of the ceramic plate-shaped object using what the density | concentrations of the said ceramic raw material powder contained in them differ from each other as 1st and 2nd slurry.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017502333A JP6196748B2 (en) | 2015-02-24 | 2016-02-19 | Setter for firing ceramic products |
CN201680004152.6A CN107001159B (en) | 2015-02-24 | 2016-02-19 | Ceramic plate-shaped body and method for producing same |
KR1020177015964A KR101928998B1 (en) | 2015-02-24 | 2016-02-19 | Ceramic plate-shaped body and method for producing same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015034119 | 2015-02-24 | ||
JP2015-034119 | 2015-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016136637A1 true WO2016136637A1 (en) | 2016-09-01 |
Family
ID=56788773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/054937 WO2016136637A1 (en) | 2015-02-24 | 2016-02-19 | Ceramic plate-shaped body and method for producing same |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP6196748B2 (en) |
KR (1) | KR101928998B1 (en) |
CN (1) | CN107001159B (en) |
TW (1) | TWI686366B (en) |
WO (1) | WO2016136637A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021111993A1 (en) * | 2019-12-03 | 2021-06-10 | 株式会社村田製作所 | Chip-shaped electronic component setter |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6964534B2 (en) * | 2018-02-19 | 2021-11-10 | 日本碍子株式会社 | Method of constructing or dismantling storage shelves, method of manufacturing ceramic fired body, and transfer system |
CN108358644A (en) * | 2018-03-06 | 2018-08-03 | 济南大学 | Based on xanthans gel casting forming TiB2The preparation method of composite ceramics biscuit |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002145672A (en) * | 2000-08-28 | 2002-05-22 | Mino Ceramic Co Ltd | Ceramic setter and method of producing the same |
JP2002265281A (en) * | 2001-03-06 | 2002-09-18 | Isolite Insulating Products Co Ltd | Setter for firing electronic part |
JP2003306386A (en) * | 2002-04-09 | 2003-10-28 | Mino Ceramic Co Ltd | Alumina ceramic setter and method for manufacturing the same |
JP2007205696A (en) * | 2006-02-06 | 2007-08-16 | Tokyo Yogyo Co Ltd | Baking setter |
JP2012158507A (en) * | 2011-02-02 | 2012-08-23 | Murata Mfg Co Ltd | Setter for firing electronic component |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1184637A1 (en) * | 2000-08-28 | 2002-03-06 | Mino Yogyo Co., Ltd. | Firing setters and process for producing these setters |
JP4929423B2 (en) * | 2010-07-22 | 2012-05-09 | 日本碍子株式会社 | Molded body and method for producing molded body |
-
2016
- 2016-02-19 JP JP2017502333A patent/JP6196748B2/en active Active
- 2016-02-19 WO PCT/JP2016/054937 patent/WO2016136637A1/en active Application Filing
- 2016-02-19 KR KR1020177015964A patent/KR101928998B1/en active IP Right Grant
- 2016-02-19 CN CN201680004152.6A patent/CN107001159B/en active Active
- 2016-02-23 TW TW105105264A patent/TWI686366B/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002145672A (en) * | 2000-08-28 | 2002-05-22 | Mino Ceramic Co Ltd | Ceramic setter and method of producing the same |
JP2002265281A (en) * | 2001-03-06 | 2002-09-18 | Isolite Insulating Products Co Ltd | Setter for firing electronic part |
JP2003306386A (en) * | 2002-04-09 | 2003-10-28 | Mino Ceramic Co Ltd | Alumina ceramic setter and method for manufacturing the same |
JP2007205696A (en) * | 2006-02-06 | 2007-08-16 | Tokyo Yogyo Co Ltd | Baking setter |
JP2012158507A (en) * | 2011-02-02 | 2012-08-23 | Murata Mfg Co Ltd | Setter for firing electronic component |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021111993A1 (en) * | 2019-12-03 | 2021-06-10 | 株式会社村田製作所 | Chip-shaped electronic component setter |
Also Published As
Publication number | Publication date |
---|---|
JP6196748B2 (en) | 2017-09-13 |
TWI686366B (en) | 2020-03-01 |
TW201638051A (en) | 2016-11-01 |
KR20170104993A (en) | 2017-09-18 |
JPWO2016136637A1 (en) | 2017-09-07 |
CN107001159A (en) | 2017-08-01 |
CN107001159B (en) | 2021-02-26 |
KR101928998B1 (en) | 2018-12-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Feilden et al. | Robocasting of structural ceramic parts with hydrogel inks | |
Dhara et al. | A simple direct casting route to ceramic foams | |
Yang et al. | Recent developments in gelcasting of ceramics | |
Leo et al. | Near‐net‐shaping methods for ceramic elements of (body) armor systems | |
Montanaro et al. | A review on aqueous gelcasting: A versatile and low-toxic technique to shape ceramics | |
Sofie et al. | Freeze casting of aqueous alumina slurries with glycerol | |
Zhang et al. | Properties of silicon carbide ceramics from gelcasting and pressureless sintering | |
Tallon et al. | Recent trends in shape forming from colloidal processing: A review | |
Wu et al. | Novel porous Si3N4 ceramics prepared by aqueous gelcasting using Si3N4 poly-hollow microspheres as pore-forming agent | |
KR102327874B1 (en) | Method for producing porous ceramic material, porous ceramic material, setter, and firing jig | |
Fukushima et al. | Fabrication and properties of ultra highly porous silicon carbide by the gelation–freezing method | |
KR100770310B1 (en) | Method for producing ceramic sintered body having the shape of curved surface | |
JP2604592B2 (en) | Molding method of metal, ceramic powder, etc. and composition therefor | |
CN103406973B (en) | A kind of alcohol aqueous gel-casting prepares the moulding process of porous or dense material | |
JP6196748B2 (en) | Setter for firing ceramic products | |
CN100404467C (en) | Ceramic cushion board and its producing method | |
JP2018193274A (en) | Ceramic lattice body | |
JP6462102B2 (en) | Ceramic lattice | |
Moritz et al. | Ceramic bodies with complex geometries and ceramic shells by freeze casting using ice as mold material | |
Fu et al. | The role of CuO–TiO 2 additives in the preparation of high-strength porous alumina scaffolds using directional freeze casting | |
CN110330358A (en) | A kind of porous alumina ceramic plate and preparation method thereof | |
JP6502165B2 (en) | Ceramic plate and method for manufacturing the same | |
JPH02172852A (en) | Production of ceramics | |
Denham et al. | Mechanical behavior of robocast alumina | |
JP2001270792A (en) | Method for producing metal/ceramic complex and method for producing ceramic porous body |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16755383 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2017502333 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20177015964 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 16755383 Country of ref document: EP Kind code of ref document: A1 |