CN115155187B - Honeycomb structure, method for producing the same, and particle catcher - Google Patents
Honeycomb structure, method for producing the same, and particle catcher Download PDFInfo
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- CN115155187B CN115155187B CN202210524742.9A CN202210524742A CN115155187B CN 115155187 B CN115155187 B CN 115155187B CN 202210524742 A CN202210524742 A CN 202210524742A CN 115155187 B CN115155187 B CN 115155187B
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- 239000002245 particle Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title description 6
- 239000011148 porous material Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000005238 degreasing Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 21
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 239000011863 silicon-based powder Substances 0.000 claims description 19
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 239000005639 Lauric acid Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000003784 tall oil Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 230000032683 aging Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000004898 kneading Methods 0.000 abstract description 4
- 238000011068 loading method Methods 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 oxide Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
-
- 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
- C04B38/0006—Honeycomb structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- 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
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
-
- 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
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a honeycomb structure, a preparation method thereof and a particle catcher. The porosity of the honeycomb structure is more than or equal to 36%, and the pores are divided into through holes and isolated holes, wherein the volume of the through holes accounts for more than 72% of the total pore volume. The preparation method comprises the following steps: mixing the raw materials, kneading, pugging, ageing, extruding and drying the obtained mixed materials to obtain cell strips, degreasing and sintering the cell strips, oxidizing the cell strips at 1250+/-10 ℃, and splicing the cell strips to obtain the honeycomb structure. The volume of the through holes is controlled to be more than 72 percent of the total pore volume, so that the back pressure characteristic and the trapping efficiency of the honeycomb structure are not reduced, and the honeycomb structure has high mechanical property, heat conduction characteristic and excellent carbon loading capacity.
Description
Technical Field
The invention relates to the field of particle traps, in particular to a honeycomb structure, a preparation method thereof and a particle trap.
Background
Porous honeycomb structures are widely used as filters for trapping and removing particulate matters in dust-containing fluids such as gasoline and diesel engine exhaust gases, or as catalyst carriers for supporting catalyst components for purifying harmful matters in exhaust gases. In addition, when such a honeycomb structure is applied to an automobile engine, it is required to face a high-temperature environment frequently, and a porous material having a plurality of pores, which is obtained by binding aggregates such as silicon carbide particles (SiC particles) with a binder such as cordierite, oxide, or metal silica powder, has excellent properties such as thermal shock resistance. The porous material can be used to form a honeycomb structure having a plurality of cells partitioned by partition walls, and can be applied to an internal combustion engine particulate filter (GPF, DPF) to filter solid particulate matters in exhaust gas through the partition walls so as to reach emission standards.
The particle catcher needs to meet the characteristics of high catching efficiency, low back pressure, high mechanical strength, high durability and the like, and particularly, the particle catcher needs to meet the high catching efficiency and reach the specified emission standard of tail gas; the pressure drop across the tail gas is also reduced, the fuel consumption of the engine is saved; meanwhile, the particle catcher needs to meet the complex road condition and vehicle condition, so that the particle catcher needs to have excellent mechanical strength and durability. But high trapping efficiency and low back pressure require products featuring high porosity, while high mechanical strength and high durability in turn require products featuring low porosity and high product density.
Most of the current processes and products only regulate the porosity to try to find the balance between the two, but with the increasing environmental protection requirements, the regulation means cannot meet the requirements of the porosity and the durability at the same time.
Chinese patent CN 110759746A adopts the addition of fibrous pore-forming agent to pass through isolated pores as through holes so as to reduce the back pressure characteristic of particle catcher, but the addition of fibrous pore-forming agent can cause the change of pore size distribution, affect the catching efficiency, and require additional control of particle size consistency and mixing consistency of pore-forming agent, increase the cost and technical difficulty of production process.
Therefore, there is a need in the art to develop a product that combines both mechanical strength and back pressure characteristics, and also combines the ease of manufacturing processes to improve the usability of the particle catcher.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a honeycomb structure, a preparation method thereof and a particle catcher.
In a first aspect, the present invention provides a honeycomb structure having a porosity of 36% or more, the pores being divided into through-holes and isolated holes, wherein the volume of the through-holes is 72% or more of the total pore volume.
Because the honeycomb ceramic structure has trapping effect of through holes, the existence of the isolated holes cannot trap particulate matters and reduce back pressure, and the heat conduction property, the compression resistance property and the carbon loading capacity of the honeycomb ceramic structure can be reduced. The volume of the through holes is controlled to be more than 72 percent of the total pore volume, so that the back pressure characteristic and the trapping efficiency of the honeycomb structure are not reduced, and the honeycomb structure has high mechanical property, heat conduction characteristic and excellent carbon loading capacity.
The through holes in the invention are holes which are contained in the honeycomb structure and are communicated with the outside when at least one hole exists. The isolated holes are holes which are contained in the honeycomb structure and are not communicated with the outside without any holes. The through holes and the isolated holes are all micron-sized.
According to the honeycomb structure provided by the invention, the raw materials of the honeycomb structure comprise metal silicon powder and silicon carbide, wherein the mass of the metal silicon powder is 10-30% of that of the silicon carbide, the particle size of the silicon carbide raw material is 21-48 mu m, the sphericity of the silicon carbide raw material is more than 0.78, the particle size of the metal silicon powder is 5-12 mu m, and the sphericity of the metal silicon powder raw material is more than 0.65.
The invention fully considers the relation of particle size, surface morphology and component content, and finds the matching characteristic of the key binder (metal silicon powder) and the silicon carbide aggregate in the aspect of raw materials. Wherein, the particle size of the silicon carbide is too small or too large, which can cause too small or too large pore size distribution; the small gaps formed by the silicon carbide particles with low sphericity can be blocked in the sintering stage if the particle size of the metal silicon powder is too small, which can cause the rising of the preparation process cost; the sphericity of the silicon carbide raw material is more than 0.78, so that small pores supported by the protruding parts of the silicon carbide aggregate with poor sphericity are prevented from being blocked by large-particle metal silicon powder; the sphericity of the metal silicon powder raw material is more than 0.65, the metal silicon powder with high sphericity is more uniformly dispersed with the silicon carbide aggregate in the mixing process, and the problem that the silicon carbide particles are small gaps due to uneven distribution and high-content metal silicon powder fusion agglomeration is avoided. In short, the volume of the through holes can be made to occupy more than 72% of the total pore volume by controlling the conditions of the raw materials within the above-mentioned ranges.
According to the honeycomb structure provided by the invention, the mass of the metal silicon powder is 18-21% of that of silicon carbide, and the particle size of the silicon carbide raw material is 28-40 mu m.
According to the honeycomb structure provided by the invention, the raw materials are subjected to oxidation treatment at 1250+/-10 ℃ after being sintered.
The metal silicon powder is enriched on the surface due to capillary phenomenon after being melted during sintering, and the silica protective film generated by oxidizing the metal silicon powder can regulate and control pore size distribution, enhance trapping efficiency, increase mechanical strength and improve durability.
According to the honeycomb structure provided by the invention, the raw materials further comprise bentonite, a sintering aid, a lubricant, a binder and water.
According to the honeycomb structure provided by the invention, the sintering aid is one or more of aluminum hydroxide, strontium oxide and magnesium carbonate.
According to the honeycomb structure provided by the invention, the lubricant is one or more of glycerol, lauric acid and tall oil.
According to the honeycomb structure provided by the invention, the adhesive is one or more of methyl cellulose and polyvinyl alcohol.
In some embodiments of the invention, metal silicon powder, silicon carbide, bentonite, sintering aid, lubricant, binder and water are mixed in a ratio of 15:70:1:1.2:1.4:4.8: 6.6.
According to the honeycomb structure provided by the invention, the median pore diameter of the through holes is 10-13 mu m.
According to the honeycomb structure provided by the invention, the bending strength of the B axis of the honeycomb structure is more than or equal to 15MPa.
According to the honeycomb structure provided by the invention, the thermal conductivity of the honeycomb structure is more than or equal to 20W/mK.
In a second aspect, the present invention provides a method of producing the above-described honeycomb structure.
The preparation method provided by the invention comprises the following steps:
mixing the raw materials, processing the obtained mixed materials to obtain cell strips, degreasing and sintering the cell strips, performing 1250+/-10 ℃ oxidation treatment, and splicing the obtained cell strips to obtain the honeycomb structure.
Further, the process includes kneading, pugging, aging, extrusion, and drying.
In a third aspect, the present invention provides a particle trap comprising the honeycomb structure described above.
The invention provides a honeycomb structure, a preparation method thereof and a particle catcher, wherein the volume of through holes is controlled to be more than 72% of the total pore volume, so that the back pressure characteristic and the catching efficiency of the honeycomb structure are not reduced, and meanwhile, the honeycomb structure has high mechanical property, heat conduction characteristic and excellent carbon loading capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it should be noted that the dimensions of the various parts in the schematic drawings are not drawn according to actual scale. The drawings in the following description are directed to embodiments of the invention.
FIG. 1 is a schematic view showing the microstructure of a honeycomb structure according to example 1 of the present invention, wherein 1,2, 3 are through holes and 4, 5 are isolated holes;
fig. 2 is a microscopic view of the honeycomb structure obtained in example 1 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless otherwise specified, the raw materials according to the examples of the present invention are all commercially available.
Example 1
The present embodiment provides a honeycomb structure, the method of which includes the steps of:
(I) Metal silicon powder, silicon carbide, bentonite, a sintering aid (aluminum hydroxide and strontium oxide in a mass ratio of 1:2), a lubricant (lauric acid), a binder (methylcellulose and polyvinyl alcohol in a mass ratio of 2:1) and water in a ratio of 15:70:1:1.2:1.4:4.8: 6.6.
And (II) kneading, pugging, ageing, extruding and drying the mixed material in the step I.
(III) degreasing and sintering (1450 ℃) the unit strips in the step (II).
(IV) oxidizing the sintered elementary streams at 1250 ℃.
And (V) splicing, grinding, skin grafting and coding the unit strips in the step (IV).
The microstructure of the obtained honeycomb structure is schematically shown in fig. 1, and the microscopic view thereof is shown in fig. 2.
Examples 2 to 11
Honeycomb structures were obtained according to the raw materials of table 1 (raw materials not mentioned in table 1 and the same amounts as in example 1) and the same production methods as in example 1.
Comparative examples 1 to 4
Honeycomb structures were obtained according to the raw materials of table 1 (raw materials not mentioned in table 1 and the same amounts as in example 1) and the same production methods as in example 1.
Comparative example 5
This comparative example provides a honeycomb structure prepared as follows from the raw materials of example 1:
mixing the raw materials, kneading, pugging, aging, extruding and drying;
Degreasing and sintering the unit strips obtained in the previous step, oxidizing at 800 ℃, and finally splicing, grinding, skin grafting and coding.
TABLE 1
Performance testing
The honeycomb structures obtained in examples 1 to 11 and comparative examples 1 to 5 were subjected to the following performance test, and the results are shown in Table 2.
(1) Three-point flexural strength (i.e., B-axis flexural strength): the test method is GB-T6569-2006;
(2) Porosity: wall-flow honeycomb ceramic for JC/T2396-2017 diesel particulate trap;
the method comprises the steps of 'measuring the water absorption, apparent porosity, apparent relative density and volume weight of the 3 rd part of the GB/T3810.3-2006 ceramic tile test method';
(3) Median pore diameter: wall-flow honeycomb ceramic for JC/T2396-2017 diesel particulate trap;
GB/T21650.1-2008 mercury intrusion and gas adsorption method for determining pore size distribution and porosity of solid materials, part 1: detection by mercury injection method;
(4) Isolated pore volume: drying the sample used in the porosity test (2) and grinding and crushing the sample; the test was conducted again in accordance with the same standard (JC/T2396-2017 wall-flow honeycomb ceramics for diesel particulate trap "regulation;" measurement of water absorption, apparent porosity, apparent relative density and volume weight of part 3 of the GB/T3810.3-2006 ceramic tile test method "). Dividing (2) the volume V 2 of the unit bar obtained by the porosity test by the volume V 1 of the powder obtained at the stage to obtain the solid rate; isolated pore volume = V 2 (1-porosity-solids).
(5) Ratio of through-holes to total pore volume: porosity cell volume V 2/(porosity cell volume V 2 + isolated pore volume).
(6) Back pressure: the back pressure tester tests the flow rate of 800m 3/h.
TABLE 2
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (3)
1. A honeycomb structure characterized in that the porosity is 36% or more, and the pores are divided into through holes and isolated holes, wherein the volume of the through holes accounts for 72% or more of the total pore volume; the median pore diameter of the through holes is 10-13 mu m;
The honeycomb structure comprises raw materials of metal silicon powder, silicon carbide, bentonite, a sintering aid, a lubricant, an adhesive and water, wherein the mass of the metal silicon powder is 18-21% of that of the silicon carbide, the particle size of the silicon carbide raw material is 28-40 mu m, the sphericity of the silicon carbide raw material is more than 0.78, the particle size of the metal silicon powder is 5-12 mu m, and the sphericity of the metal silicon powder raw material is more than 0.65;
The sintering aid is one or more of aluminum hydroxide, strontium oxide and magnesium carbonate; the lubricant is one or more of glycerol, lauric acid and tall oil; the adhesive is one or more of methyl cellulose and polyvinyl alcohol;
the preparation method of the honeycomb structure comprises the following steps:
mixing the raw materials, processing the obtained mixed materials to obtain cell strips, degreasing and sintering the cell strips, performing 1250+/-10 ℃ oxidation treatment, and splicing the obtained cell strips to obtain the honeycomb structure.
2. The honeycomb structure according to claim 1, wherein the flexural strength of the B-axis of the honeycomb structure is not less than 15MPa;
And/or the thermal conductivity of the honeycomb structure is more than or equal to 20W/mK.
3. A particle trap comprising the honeycomb structure of claim 1 or 2.
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| CN110645070A (en) * | 2018-06-27 | 2020-01-03 | 株式会社电装 | Honeycomb structure and exhaust gas purifying filter |
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