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Method of preparing iolite honeycomb ceramic having relatively low thermel expansion coefficient

A technology of cordierite honeycomb and thermal expansion coefficient, applied in ceramic products, mechanical equipment, applications, etc., can solve the problems of reducing thermal expansion coefficient, damage, harsh process, etc., and achieve the effect of reducing thermal expansion coefficient

Inactive Publication Date: 2006-06-14
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the following disadvantages: (1) the preparation process is difficult to control, such as the above method b, if the lamellar raw material is selected, the lamellar structure will be destroyed during the subsequent ball milling and mixing, and the desired effect cannot be achieved
(2) Reducing the thermal expansion coefficient is limited, the above method can only reduce the thermal expansion coefficient of the material within a limited range
(3) The process is harsh and difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1: Magnesium carbonate powder, talc powder, and calcined kaolin were used as raw materials to synthesize cordierite honeycomb ceramic powder.

[0065] Step 1: Synthesis of cordierite powder

[0066] The raw materials are magnesium carbonate powder with a purity greater than 99.5% and an average particle size of 3.85 μm, talc powder with a purity greater than 99.2% and an average particle size of 1.5 μm, and calcined kaolin with a purity greater than 99.2% and an average particle size of 1.0 μm. Its formula is as follows: the talcum powder of 34.9wt%; The kaolin of 51.4wt%, the magnesium carbonate of 13.7wt%, the analysis oxide composition is: the aluminum oxide of 34.9wt%, the silicon dioxide of 51.4wt%, the oxide of 13.7wt% magnesium. According to the ratio of 1.5 kg of deionized water or distilled water per kg of dry powder, add 1.0wt%% neutral dispersant (JA282) and put them together into a ball mill tank for wet mixing. The ratio of ball to material is 2:1....

Embodiment 2

[0073] Embodiment 2: using α-Al 2 o 3 Powder, talcum powder and calcined kaolin were used as raw materials to prepare cordierite honeycomb ceramics.

[0074] Step 1: Synthesize cordierite powder.

[0075] The raw material is α-Al with a purity greater than 99.5% and an average particle size of 2.84 μm 2 o 3 Powder, talc powder with a purity greater than 99.2% and an average particle size of 1.5 μm, and calcined kaolin with a purity greater than 99.2% and an average particle size of 1.0 μm. Its formula is as follows: the talcum powder of 34.9wt%; The kaolin of 51.4wt%, the alumina of 13.7wt%, the analysis oxide composition is: the alumina of 34.9wt%, the silicon dioxide of 51.4wt%, the oxide of 13.7wt% magnesium. According to the ratio of adding 1.5 kg of deionized water or distilled water per kg of dry powder, add 0.8wt%% self-developed neutral dispersant (JA282), and put them into a ball mill tank for wet mixing. The ball-to-material ratio is: 2: 1. The ball milling met...

Embodiment 3

[0081] Example 3: Cordierite honeycomb ceramics were prepared using chlorite powder and calcined kaolin as raw materials.

[0082] Step 1: Synthesize cordierite powder.

[0083] Chlorite powder with a material purity greater than 99.0% and an average particle size of 1.5 μm, and calcined kaolin with a purity greater than 99.2% and an average particle size of 1.0 μm, the analyzed oxide composition is: 33.6 wt% alumina, 52.3 wt% carbon dioxide Silicon, 14.1 wt% magnesium oxide. According to the ratio of adding 1.5 kg of deionized water or distilled water per kg of dry powder, and adding 1.0 wt% % self-developed neutral dispersant (JA282), put them into a ball mill tank together for wet mixing. The ball-to-material ratio is: 1.8: 1. The ball milling method can be: roller milling, ball milling time: 20h; after mixing fully, pour out the mud and put it in an oven for drying at a drying temperature of 120°C, and finally obtain a uniformly mixed and dry raw material mixed powder. P...

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Abstract

The present invention relates to an improvement on preparation method of lower thermal expansion coefficient cordierite honeycomb ceramic which can be used as auto exhaust gas purifier carrier. Its process includes the following steps: synthesizing cordierite powder, synthesizing zirconium tungstate powder, mixing components, vacuum mixing mud, vacuum extruding, microwave forming, drying in drying oven, processing blank, high-temperature sintering and checking.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to the improvement of a method for preparing cordierite honeycomb ceramics with a relatively low thermal expansion coefficient used as a carrier for automobile exhaust gas purifiers. Background technique [0002] Because of cordierite's low coefficient of thermal expansion, dielectric properties, and high chemical stability, cordierite ceramics and glass-ceramics are widely used in occasions that require strict thermal shock and thermal expansion. It has long been suitable as a carrier to support the catalytically active components of catalytic converters in automobiles, also because cordierite ceramics have good thermal shock resistance. The thermal shock resistance of a material is inversely proportional to the thermal expansion coefficient of the material itself. Therefore, it is of great significance to take measures to reduce the thermal expansion coefficient of c...

Claims

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Application Information

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IPC IPC(8): C04B35/195C04B35/622C04B38/00F01N3/28
Inventor 仝建峰陈大明刘晓光李宝伟华文君
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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