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Method of preparing iolite honeycomb ceramics for automobile tail gas purifier

A cordierite honeycomb and cordierite technology, which is applied in the field of preparation of cordierite honeycomb ceramics, can solve the problems of uneven mixing of raw materials, large shrinkage of green body, low solid content, etc. Effect of solid phase volume fraction

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

Among them, the existing problems are: uneven mixing of raw materials, more liquid needs to be added to the mud body, the solid content is low, and the body shrinks greatly during the drying process, which is prone to cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1: Magnesium carbonate powder, talc powder, and calcined kaolin were used as raw materials to prepare cordierite honeycomb ceramics.

[0059] Step 1: Synthesize cordierite powder.

[0060] 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. The formula is as follows: 34.9wt % talcum powder; 51.4wt% kaolin, 13.7wt% magnesium carbonate, the analysis oxide composition is: 34.9wt% aluminum oxide, 51.4wt% silicon dioxide, 13.7wt% magnesium oxide. 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. The method can be: roller milling, ball milling ti...

Embodiment 2

[0065] Embodiment 2: using α-Al 2 o 3 Powder, talcum powder and calcined kaolin were used as raw materials to prepare cordierite honeycomb ceramics.

[0066] Step 1: Synthesize cordierite powder.

[0067] 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, calcined kaolin with a purity greater than 99.2% and an average particle size of 1.0 μm, the formula is as follows: 34.9 wt% talc powder; 51.4 wt% kaolin, 13.7 wt% Alumina, analyzed oxide composition: 34.9wt% alumina, 51.4wt% silicon dioxide, 13.7wt% magnesia. 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 method can be: roller milling, the ball milling time is: 15h; p...

Embodiment 3

[0071] Example 3: Cordierite honeycomb ceramics were prepared using chlorite powder and calcined kaolin as raw materials.

[0072] Step 1: Synthesize cordierite powder.

[0073] 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 formula is as follows: 35wt% chlorite powder; 65wt% kaolin, the composition of the oxide is analyzed as : 33.6wt% alumina, 52.3wt% silica, 14.1wt% magnesia. 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 unif...

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Abstract

The present invention belongs to a ceramic material preparation process, and relates to a cordierite honeycomb ceramic preparation process. Said process includes the following steps: preparing material, synthesizing cordierite powder, wet mud-forming, vacuum mixing mud, vacuum extruding, microwave forming, drying in drying oven, processing blank body and high-temperature sintering. Said cordierite honeycomb ceramic can be used as carrier of catalyst, can be extensively used for purifying industrial noxious gas and auto exhaust gas, also can be used for making ceramic heat exchanger, etc.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a preparation method of cordierite honeycomb ceramics used as an automobile tail gas purifier. 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 traditional preparation method of cordierite honeycomb ceramics is to directly mix various raw material dry powders with binders, water, and lubricants, then smelt and extrude. Among them, the existing problems are: the mixing of raw materials is not uniform, more liquid needs to be added to the mud body, the soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/195C04B35/622C04B38/00F01N3/28
CPCY02A50/20
Inventor 仝建峰陈大明李宝伟刘晓光华文君
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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