CN113443927B - Skin slurry, porous honeycomb ceramic with skin and preparation method - Google Patents
Skin slurry, porous honeycomb ceramic with skin and preparation method Download PDFInfo
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- CN113443927B CN113443927B CN202110696897.6A CN202110696897A CN113443927B CN 113443927 B CN113443927 B CN 113443927B CN 202110696897 A CN202110696897 A CN 202110696897A CN 113443927 B CN113443927 B CN 113443927B
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
Abstract
The invention discloses a skin slurry, a porous honeycomb ceramic with a skin and a preparation method thereof, wherein the preparation method of the skin slurry comprises the following steps: step 1: the weight ratio is 100:10-15:0.5-1: weighing inorganic filler, ceramic fiber, organic binder, silica sol and water according to the proportion of 30-40; step 2: uniformly mixing the inorganic filler, the ceramic fiber and the organic binder weighed in the step 1 to obtain a dry powder mixture; and step 3: uniformly mixing the silica sol weighed in the step 1 and water to obtain a liquid mixture; and 4, step 4: and (3) uniformly mixing the dry powder mixture prepared in the step (2) and the liquid mixture prepared in the step (3) to obtain mixed slurry, namely the skin slurry. The silica hollow spheres are added, so that the outer skin layer of the porous honeycomb ceramic has low thermal expansion coefficient, high strength, high thermal shock resistance and good coating performance, and the problem that the outer skin or the matrix is cracked due to poor thermal shock of a honeycomb ceramic carrier is solved.
Description
Technical Field
The invention belongs to the field of honeycomb ceramics, and particularly relates to a preparation method of porous honeycomb ceramics with an outer skin and a product thereof.
Background
Harmful substances discharged by the tail gas of the internal combustion engine are mainly NOx, HC, CO and the like, are main sources of air pollution, and seriously affect the health and the life quality of people. The cordierite honeycomb ceramic has physical characteristics of large specific surface area, small thermal expansion coefficient and the like, becomes a key part of an internal combustion engine exhaust after-treatment system of automobiles, ships, non-road mobile machinery and the like, can provide enough coating surface area for a catalyst, converts harmful substances such as NOx, HC, CO and the like in exhaust into harmless substances, and can also filter carbon smoke Particles (PM) in motor vehicle exhaust through a microporous structure in a wall flow type carrier such as DPF, GPF and the like. Along with the enactment of national environmental protection regulations, the emission standard of automobile exhaust is increasingly strict, the automobile post-treatment system is continuously upgraded, higher requirements are provided for the use temperature of the honeycomb ceramic carrier, and the honeycomb ceramic carrier is required to have lower thermal expansion coefficient and better thermal shock resistance.
The honeycomb ceramic outer skin prepared by the existing preparation method is poor in thermal shock resistance, and easily cracks a honeycomb body, so that the honeycomb ceramic cannot play a basic function as a catalyst carrier or a particle catcher, for example, CN105906367A adopts cordierite powder, ceramic fiber, fiber dispersing agent, silica sol and water to form ceramic slurry, the ceramic slurry is coated on the outer peripheral surface of the honeycomb ceramic in a blade mode, the honeycomb ceramic outer skin is formed after drying, the thermal shock resistance temperature is only 500-650 ℃, CN111170709A mixes cordierite fine powder, ceramic fiber powder and methyl cellulose to prepare mixed powder, then the silica sol and emulsion are added into the mixed powder to mix to obtain skin-grafting mud, and the thermal shock resistance temperature is 700 ℃.
Disclosure of Invention
In order to solve the above technical problems, the present invention aims to provide a porous honeycomb ceramic having an outer skin, which is simple and convenient in manufacturing method and has a good thermal shock resistance.
In order to solve the technical problems, the technical scheme of the invention is as follows: a preparation method of porous honeycomb ceramics with an outer skin is characterized by comprising the following steps:
step 1: according to the weight ratio of 100:10-15:0.5-1: weighing inorganic filler, ceramic fiber, organic binder, silica sol and water according to the proportion of 30-40;
step 2: uniformly mixing the inorganic filler, the ceramic fiber and the organic binder weighed in the step 1 to obtain a dry powder mixture;
and 3, step 3: uniformly mixing the silica sol weighed in the step 1 and water to obtain a liquid mixture;
and 4, step 4: uniformly mixing the dry powder mixture prepared in the step 2 and the liquid mixture prepared in the step 3 to obtain mixed slurry;
and 5: and (5) coating the slurry obtained in the step (4) on the periphery of the honeycomb ceramic blank, and drying at normal temperature to obtain the porous honeycomb ceramic with the outer skin.
In the above technical scheme, the inorganic filler in step 1 comprises fused quartz powder A, fused quartz powder B and silica hollow spheres, wherein D of the fused quartz powder A 50 D of the fused quartz powder B is 85-104 mu m 50 Is 3-5 μm.
In the technical scheme, the mass ratio of the fused quartz powder A to the inorganic filler is 3-20%, the mass ratio of the fused quartz powder B to the inorganic filler is 8-20%, and the mass ratio of the silica hollow spheres to the inorganic filler is 60-85%.
In the technical scheme, the ceramic fiber is a composition consisting of one or more of alumina silicate fiber, zirconium-containing alumina silicate fiber, alumina fiber, mullite fiber and quartz fiber.
In the technical scheme, the average fiber length of the ceramic fiber is 50-120 mu m.
In the technical scheme, the organic binder is a composition consisting of one or more of polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose and ethyl cellulose.
In the above technical scheme, the water in the step 3 is deionized water.
In the technical scheme, the shell wall of the silica hollow sphere is 0.4-0.6 mu m in thickness, and D is 50 Is 25-32 μm.
The second purpose of the invention is to provide a product prepared by the preparation method of the porous honeycomb ceramic with the skin.
The invention has the beneficial effects that: according to the invention, the silica hollow spheres are added, so that the outer skin layer of the porous honeycomb ceramic has low thermal expansion coefficient, high strength, high thermal shock resistance and good coating performance, and the problem that the outer skin or the matrix is cracked due to poor thermal shock of the honeycomb ceramic carrier is solved.
Drawings
FIG. 1 is a flow chart of a process for preparing a porous honeycomb ceramic skin;
FIG. 2 is an SEM 500 times micrograph of a silica hollow sphere;
FIG. 3 is an SEM 500 photomicrograph of an outer skin layer of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, a method for preparing a porous honeycomb ceramic having an outer skin includes the following steps, step 1: weighing 20 percent of D according to mass fraction 50 Fused quartz powder A of 98 μm, 20% D 50 5 μm fused silica powder B,60% D 50 The silica hollow spheres (shown in figure 2) with the particle size of 30 μm are uniformly mixed to obtain the inorganic filler;
step 2: mixing 100 parts by weight of the inorganic filler obtained in the step 1, 13 parts by weight of alumina silicate fiber with the average length of 100 mu m and 1 part by weight of methyl cellulose into dry powder for 1 hour, and mixing 35 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution;
and 3, step 3: mixing the dry powder prepared in the step 2 with the mixed solution for 15 minutes to obtain skin slurry;
and 4, step 4: and (3) coating the outer skin slurry obtained in the step (3) on the periphery of the honeycomb ceramic through an automatic skin-grafting machine, controlling the thickness of the outer skin to be 0.6-2mm, drying at normal temperature for 48h to obtain the porous honeycomb ceramic with the outer skin, and casting sample blocks (for testing compressive strength) of 25mm multiplied by 25mm and sample blocks (for testing thermal expansion coefficient) of 6mm multiplied by 25mm by using the outer skin slurry obtained in the step (3), wherein the enlarged structure of the outer skin can be shown in figure 3.
Example 2
The difference from example 1 is that, in step 1: weighing 20 percent of D according to mass fraction 50 Fused quartz powder A of 98 μm, D of 15% 50 Of 5 μmFused silica powder B,65% D 50 The silica hollow spheres are 30 microns and are mixed to obtain the inorganic filler;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of alumina silicate fiber with the average length of 100 mu m and 0.8 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 3
The difference from example 2 is that, in step 1: weighing 17 percent of D according to mass fraction 50 Fused quartz powder A of 98 μm, D of 8% 50 5 μm fused silica powder B,75% D 50 The silica hollow spheres are 30 microns and are mixed to obtain the inorganic filler;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 10 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 4
The difference from example 3 is that, in step 1: weighing 7 percent of D according to mass fraction 50 Fused quartz powder A of 98 μm, D of 8% 50 5 μm fused silica powder B,85% D 50 The inorganic filler is a hollow silica sphere with the diameter of 30 mu m;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 5
The difference from example 4 is that, in step 1: weighing 15 percent of D according to mass fraction 50 Fused quartz powder A of 98 μm, 20% D 50 5 mu m fused quartz powder B,65%D of (1) 50 The silica hollow sphere is 30 mu m, and the inorganic filler is obtained by the three parts;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.8 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 6
The difference from example 5 is that, in step 1: weighing 8 percent of D according to mass fraction 50 An electrofused quartz powder A of 98 μm, D17% 50 5 μm fused silica powder B,75% D 50 The inorganic filler is a hollow silica sphere with the diameter of 30 mu m;
and 2, step: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.8 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 10 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 7
The difference from example 6 is that, in step 1: weighing 8 percent of D according to mass fraction 50 An electrofused quartz powder A of 98 μm, D of 7% 50 5 μm fused silica powder B,85% D 50 The inorganic filler is a hollow silica sphere with the diameter of 30 mu m;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 10 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 8
The difference from example 7 is that, in step 1: weighing 17 percent of D according to mass fraction 50 98 μm fused silica powder A,8% D 50 5 μm fused silica powder B,75% D 50 Silica of 30 μmHollow balls, and the three are used for obtaining inorganic filler;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 11 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose into dry powder for 1 hour, and mixing 40 parts by weight of silica sol and 10 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 9
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 11 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 11 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 10
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 13 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 11 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 11
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 14 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 40 parts by weight of silica sol and 12 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 12
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 15 parts by weight of aluminum silicate fibers with the average length of 100 mu m and 0.7 part by weight of methyl cellulose into dry powder for 1 hour, and mixing 40 parts by weight of silica sol and 12.5 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 13
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fiber with the average length of 50 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 20 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 14
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fiber with the average length of 75 mu m and 0.7 part by weight of methyl cellulose into dry powder for 1 hour, and mixing 35 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 15
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fibers with the average length of 120 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 10 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 16
The difference from example 8 is that, in step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of zirconium-containing aluminum silicate fiber with the average length of 100 mu m and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 15 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Example 17
The difference from example 16 is that the alumina-silicate fibers containing zirconium were replaced by alumina fibers in step 2.
Example 18
The difference from example 16 is that the alumina-silicate fibers containing zirconium in step 2 were replaced by mullite fibers.
Example 19
The difference from example 16 is that the alumina silicate fiber containing zirconium in step 2 is replaced by a quartz fiber.
Example 20
The difference from example 18 is that in step 2, the methyl cellulose is replaced by polyvinyl alcohol.
Example 21
The difference from example 18 is that in step 2, the methyl cellulose is replaced by carboxymethyl cellulose.
Example 22
The difference from example 18 is that the methyl cellulose is replaced by ethyl cellulose in step 2.
Comparative example 1
The difference from example 1 is that, in step 1: according to the patent CN105906367A, 40% of D is weighed according to the parts by weight 50 Cordierite powder of 30 μm and D of 60% 50 Cordierite powder with the particle size of 15 mu m to obtain inorganic filler;
and 2, step: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 10 parts by weight of aluminum silicate fiber with the average length of 100 mu m, 2.5 parts by weight of sodium stearate and 0.75 part by weight of methyl cellulose to obtain dry powder, mixing for 1 hour, and mixing 55 parts by weight of silica sol and 30 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
Comparative example 2:
the difference from example 1 is that, in step 1: weighing 80% of D in parts by mass 50 Fused quartz powder A of 98 μm, 20% D 50 5 μm fused quartz powder B to obtain inorganic filler;
step 2: and (2) mixing 100 parts by weight of the inorganic filler obtained in the step (1), 15 parts by weight of alumina silicate fiber with the average length of 100 micrometers and 0.7 part by weight of methyl cellulose to obtain dry powder, wherein the mixing time is 1 hour, and mixing 35 parts by weight of silica sol and 12.5 parts by weight of deionized water for 8 minutes to obtain a mixed solution.
The following evaluations were made for the above examples and comparative examples.
To compare coatability and thermal shock resistance of examples and comparative examples, gasoline particulate traps (GPFs) having a diameter of 132.1mm, a height of 127mm, a cell density of 300cpsi, and a wall thickness of 8 mils were prepared using each of examples and comparative examples, although the diameter, height, cell density, and wall thickness of the porous honeycomb ceramics are not limited thereto.
The detection indexes are as follows:
(1) Coating property of outer skin slurry on porous honeycomb ceramic structure
The mechanically ground and sized porous honeycomb ceramics were subjected to skin grafting using an automatic skin grafting machine, and the surface of the formed skin was visually observed to evaluate the coating properties, in which the case where the coating was uniform and had no appearance defect was denoted as a, and the case where the coating was uneven or the coating itself was difficult was denoted as B.
(2) The samples of 25mm × 25mm × 25mm in specification prepared in each of examples and comparative examples were subjected to a microcomputer-controlled electronic pressure tester of industrial test systems limited in denham to test the compressive strength of the porous honeycomb ceramic skin.
(3) The samples of 6mm × 6mm × 25mm in specification prepared in each of examples and comparative examples were tested for the thermal expansion coefficient of the outer skin of the porous honeycomb ceramic using a thermal expansion meter of german stainless instrument manufacturing ltd, model number DIL402 PC.
(4) The gasoline engine particle trap (GPF) made of the porous honeycomb ceramic material having the skin prepared in each of examples and comparative examples was put in an electric furnace maintained at a prescribed temperature, a thermal shock resistance test was performed, the furnace temperature was raised to a minimum temperature of 650 ℃ required by the standards at a temperature rise rate of not more than 6 ℃/min, and the samples were put in the furnace chambers so as not to contact each other.
And (3) after the temperature is raised to the set temperature, keeping the temperature for 30min, opening a furnace door, taking out the gasoline engine particle trap, naturally cooling the gasoline engine particle trap to room temperature in the air, performing 3 times of cyclic operation on the gasoline engine particle trap, observing whether the gasoline engine particle trap cracks after each thermal cycle, if the gasoline engine particle trap does not crack after 3 times of cycles, continuously raising the detection temperature, raising the temperature by 50 ℃ each time until the gasoline engine particle trap cracks after 3 times of cycles, recording the temperature lower than the test temperature as the thermal shock resistance temperature, and keeping the test highest temperature not to exceed 1000 ℃.
The products obtained in the above examples and comparative examples were subjected to performance tests, and the results are shown in table 1 below.
TABLE 1 results of performance test of each of examples and comparative examples
As can be seen from the comparative analysis of the test results of examples 1 to 22 and comparative examples 1 to 2 in Table 1 above:
(1) The coating performance of the outer skin slurry using the silicon dioxide hollow spheres is more excellent, and the spherical particles increase the lubricity and fluidity between the outer skin slurry and the porous honeycomb ceramic material, so that the coating performance is better;
(2) The compressive strength of the outer skin layer of the hollow silica sphere is close to that of a comparative example, and the hollow silica sphere has a hollow open shell structure and high strength (can bear 25MPa and is not damaged under compressive strength);
(3) The outer skin layer using hollow silica spheres generally has a lower Coefficient of Thermal Expansion (CTE) than the comparative example without hollow silica spheres, and has a significantly higher thermal shock temperature than the comparative example, and in some embodiments can even be as high as 1000 ℃;
the test proves that: the skin with good coating performance, high strength, low thermal expansion coefficient and high thermal shock resistance is prepared by adopting a normal-temperature drying process, the severe environment for using the honeycomb ceramic is met, the thermal shock resistance of the honeycomb ceramic is obviously improved, and the preparation process is simple and easy to implement and is suitable for large-scale industrial production.
The outer skin slurry of the present invention can be used for manufacturing an outer skin-planted honeycomb structure which can be applied to various fields such as but not limited to gasoline vehicles, diesel vehicles, chemistry, steel, electric power, etc. and can be preferably used as a carrier for coating a catalyst or a particulate filter.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The preparation method of the outer skin slurry is characterized by comprising the following steps:
step 1: according to the weight ratio of 100:10:0.7: weighing inorganic filler, ceramic fiber with the average length of 100 mu m, organic binder, silica sol and deionized water according to the proportion of 35;
step 2: uniformly mixing the inorganic filler, the ceramic fiber and the organic binder weighed in the step 1 to obtain a dry powder mixture;
and 3, step 3: uniformly mixing the silica sol weighed in the step 1 and water to obtain a liquid mixture;
and 4, step 4: uniformly mixing the dry powder mixture prepared in the step 2 and the liquid mixture prepared in the step 3 to obtain mixed slurry, namely skin slurry;
wherein, the inorganic filler in the step 1 comprises fused quartz powder A, fused quartz powder B and silica hollow spheres, wherein D of the fused quartz powder A 50 D of the fused quartz powder B is 98 mu m 50 Is 5 μm, the shell wall thickness of the silica hollow sphere is 0.4-0.6 μm, and D is 50 Is 30 μm;
the mass ratio of the fused quartz powder A to the inorganic filler is 17%, the mass ratio of the fused quartz powder B to the inorganic filler is 8%, and the mass ratio of the silicon dioxide hollow spheres to the inorganic filler is 75%; the ceramic fiber is mullite fiber; the organic binder is methyl cellulose or carboxymethyl cellulose.
2. The skin paste prepared by the method of claim 1.
3. A preparation method of porous honeycomb ceramics with an outer skin is characterized in that the outer skin slurry of claim 2 is coated on the periphery of a honeycomb ceramic blank and dried at normal temperature to obtain the porous honeycomb ceramics with the outer skin; wherein the coating thickness of the outer skin slurry is 0.6-2mm.
4. A porous honeycomb ceramic having an outer skin obtained by the method for producing a porous honeycomb ceramic having an outer skin according to claim 3.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1813339A1 (en) * | 2006-01-27 | 2007-08-01 | Ibiden Co., Ltd. | Honeycomb structure and method for manufacturing honeycomb structure |
| CN101031348A (en) * | 2005-08-26 | 2007-09-05 | 揖斐电株式会社 | Honeycomb structure and manufacturing method thereof |
| CN101495425A (en) * | 2006-07-14 | 2009-07-29 | 康宁股份有限公司 | Plugging material for aluminum titanate ceramic wall flow filter manufacture |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101309883B (en) * | 2006-01-27 | 2012-12-26 | 揖斐电株式会社 | Honeycomb structure and method for manufacturing honeycomb structure |
| JP5673665B2 (en) * | 2010-02-22 | 2015-02-18 | 日立金属株式会社 | Ceramic honeycomb structure and manufacturing method thereof |
| US8999483B2 (en) * | 2010-11-29 | 2015-04-07 | Corning Incorporated | Honeycomb structure comprising an outer cement skin and a cement therefor |
| CN102531556B (en) * | 2010-12-08 | 2014-04-02 | 中国科学院过程工程研究所 | Preparation method of hollow inorganic oxide microspheres with high pressure resistance and low density |
| CN103145439B (en) * | 2013-02-21 | 2014-09-17 | 安徽中鼎美达环保科技有限公司 | Honeycombed porous ceramic having high thermal conductivity and ultralow expansion coefficient |
| CN103480433B (en) * | 2013-09-23 | 2015-04-29 | 宜兴王子制陶有限公司 | Preparing method for skin of ceramic catalyst carrier |
| EP3137432B1 (en) * | 2014-05-01 | 2018-06-13 | Corning Incorporated | Honeycomb structure comprising a cement skin composition with crystalline inorganic fibrous material and method of manufacturing it |
| US10300475B2 (en) * | 2016-12-26 | 2019-05-28 | Ngk Insulators, Ltd. | Circumferential coating material and circumferential coating honeycomb structure |
| JP6735261B2 (en) * | 2016-12-26 | 2020-08-05 | 日本碍子株式会社 | Peripheral coat material and peripheral coat honeycomb structure |
| JP6966984B2 (en) * | 2018-09-20 | 2021-11-17 | 日本碍子株式会社 | Peripheral coating material, outer peripheral coating honeycomb structure and dust collecting filter |
| US11884598B2 (en) * | 2019-03-12 | 2024-01-30 | Corning, Incorporated | Ceramic honeycomb body with skin |
| CN112608627B (en) * | 2020-12-03 | 2021-09-17 | 山东奥福环保科技股份有限公司 | Low-thermal-expansion honeycomb ceramic body peripheral coating material and preparation method thereof |
-
2021
- 2021-06-23 CN CN202110696897.6A patent/CN113443927B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031348A (en) * | 2005-08-26 | 2007-09-05 | 揖斐电株式会社 | Honeycomb structure and manufacturing method thereof |
| EP1813339A1 (en) * | 2006-01-27 | 2007-08-01 | Ibiden Co., Ltd. | Honeycomb structure and method for manufacturing honeycomb structure |
| CN101495425A (en) * | 2006-07-14 | 2009-07-29 | 康宁股份有限公司 | Plugging material for aluminum titanate ceramic wall flow filter manufacture |
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