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A large-diameter honeycomb ceramic carrier with low thermal expansion and its preparation method

A honeycomb ceramic carrier, low thermal expansion technology, used in ceramic products, separation methods, catalyst carriers, etc., can solve the problems of poor water resistance of the outer skin, pulverization, peeling of the outer skin, etc., and achieves good dry-wet alternation resistance and high strength. Effect

Active Publication Date: 2020-04-21
CHONGQING AOFU FINE CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the outer skin of the large-diameter (diameter ≥ 190.5mm) honeycomb ceramic carrier generally adopts one or two kinds of powder as the matrix, and uses sodium silicate, potassium silicate, and phosphate solution as the binder; Or two kinds of silica powder as the matrix, using silica sol as the binder and high temperature resistant fiber as the reinforcing agent, relying on the low thermal expansion of the fused silica itself to reduce the thermal expansion of the outer skin, but this method has high cost and electricity Risk of fused silica transforming into highly expansive crystalline quartz on prolonged heating without taking into account the water resistance of the outer skin
[0005] The existing method for preparing the outer skin of a large-diameter honeycomb ceramic carrier usually has high cost and poor water resistance of the outer skin. When the catalyst is coated, the solution enters the outer skin, and the outer skin is prone to peeling and pulverization.

Method used

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  • A large-diameter honeycomb ceramic carrier with low thermal expansion and its preparation method
  • A large-diameter honeycomb ceramic carrier with low thermal expansion and its preparation method
  • A large-diameter honeycomb ceramic carrier with low thermal expansion and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Adopt dry method to mix 24% by weight of 80-120 mesh cordierite powder, 13% by weight of 120-150 mesh cordierite powder, 10% by weight of 150-180 mesh cordierite powder, 6% by weight of 180-220 mesh Mesh cordierite powder, 47% by weight of cordierite powder below 300 mesh, to obtain closely packed cordierite graded powder;

[0046] (2) V-type mixing of 96% by weight of the cordierite graded powder of step (1), 4% by weight of calcium hydroxide powder with an average particle size of 48 μm, relative to 100 parts by weight of the obtained inorganic powder, plus 0.5% by weight organic binder (hydroxypropyl methylcellulose);

[0047](3) Mixed solution: lithium silicate solution with modulus 4.2 of 35% of the sum of cordierite graded powder and calcium hydroxide powder mass, pure 35% of the sum of cordierite graded powder and calcium hydroxide powder mass water;

[0048] (4) Add the dry powder of step (2) into the mixed solution of step (3), and stir for 5 minutes at a...

Embodiment 2

[0051] (1) Adopt dry method to mix the 80-120 mesh cordierite powder of 22% by weight, the 120-150 mesh cordierite powder of 13% by weight, the 150-180 mesh cordierite powder of 10% by weight, the 180-220 mesh of 6% by weight Mesh cordierite powder, 47% by weight of cordierite powder below 300 mesh, to obtain closely packed cordierite graded powder;

[0052] (2) V-type mixing of 96% by weight of the cordierite graded powder of step (1), 4% by weight of calcium hydroxide powder with an average particle size of 48 μm, relative to 100 parts by weight of the obtained inorganic powder, plus 1.0% by weight organic binder (hydroxypropyl methylcellulose);

[0053] (3) Mixed solution: lithium silicate solution with modulus 4.2 of 35% of the sum of cordierite graded powder and calcium hydroxide powder mass, pure 35% of the sum of cordierite graded powder and calcium hydroxide powder mass water;

[0054] (4) Add the dry powder of step (2) into the mixed solution of step (3), and stir f...

Embodiment 3

[0057] (1) Adopt dry method to mix the 80-120 mesh cordierite powder of 22% by weight, the 120-150 mesh cordierite powder of 13% by weight, the 150-180 mesh cordierite powder of 10% by weight, the 180-220 mesh of 6% by weight Mesh cordierite powder, 47% by weight of cordierite powder below 300 mesh, to obtain closely packed cordierite graded powder;

[0058] (2) V-type mixing of 99% by weight of the cordierite graded powder of step (1), 1% by weight of calcium hydroxide powder with an average particle size of 30 μm, relative to 100 parts by weight of the obtained inorganic powder, plus 1.0% by weight organic binder (hydroxypropyl methylcellulose);

[0059] (3) Mixed liquor: Lithium silicate solution with modulus 4.5 of 20% of the sum of cordierite graded powder and calcium hydroxide powder mass, pure 50% of the sum of cordierite graded powder and calcium hydroxide powder mass water;

[0060] (4) Add the dry powder of step (2) into the mixed solution of step (3), and stir for...

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Abstract

The invention discloses a lower thermal expansion large-diameter ceramic honeycomb carrier and a preparation method thereof. An outer surface of the lower thermal expansion large-diameter ceramic honeycomb carrier contains the following preparative raw materials: multi-graded cordierite powder, lithium silicate solution, calcium hydroxide powder, an organic adhesive and water. After high-temperature drying, the requirements on high strength and high water resistance can be met. The outer surface of the ceramic honeycomb carrier disclosed by the invention solves the problems such as low strength, low water resistance and high thermal expansion coefficient when the outer surface is prepared by using other adhesives such as sodium silicate, phosphate and silica sol, and compared with a process of first edge surrounding and then roasting, the method disclosed by the invention is low in cost and solves the problem of catalyst leakage during catalyst coating.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a large-diameter honeycomb ceramic carrier with high strength, high water resistance and low thermal expansion and a preparation method thereof. Background technique [0002] In recent years, with the increase in the number of motor vehicles, however, a large number of particles contained in motor vehicle exhaust gas have gradually become the main source of urban pollution, seriously threatening the living environment of human beings, and it is necessary to deal with them in a timely and effective manner. Motor vehicle aftertreatment systems are the core components of aftertreatment systems that are necessary to treat exhaust gases to meet stringent regulations. In automotive applications, cordierite ceramic honeycomb articles are often used as catalyst supports for exhaust gas purification. [0003] Due to unpredictable drying and shrinkage, it is cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/04C04B41/87B01J32/00B01D53/94
CPCB01D53/94B01J35/04C04B41/009C04B41/5027C04B41/87C04B41/5024C04B41/50C04B41/4803C04B41/4539C04B38/0006
Inventor 黄妃慧潘吉庆刘洪月刘坤牛思浔王勇伟程国园王东东
Owner CHONGQING AOFU FINE CERAMICS CO LTD
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