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Silicon carbide-cordierite composite porous ceramic and its preparation method

A kind of technology of porous ceramics, cordierite

Inactive Publication Date: 2006-07-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low thermal conductivity of cordierite, when it is used as a carbon particulate filter, during the regeneration process of cordierite honeycomb ceramics, the heat generated by the combustion of carbon particulates cannot be conducted quickly, resulting in excessive local temperature. , softening, causing damage to the porous structure

Method used

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  • Silicon carbide-cordierite composite porous ceramic and its preparation method
  • Silicon carbide-cordierite composite porous ceramic and its preparation method
  • Silicon carbide-cordierite composite porous ceramic and its preparation method

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Embodiment 1

[0021] The starting materials for synthesizing cordierite are clay, talc and alumina powder, the median particle sizes are 0.6, 7.0 and 0.8 μm respectively, and the total content of impurities (calculated as oxides) is all lower than 1.0 wt%. The silicon carbide used is commercial silicon carbide powder of α phase, with a median particle size of 21.1 μm and a purity of 98.8 wt%. Graphite powder is selected as the pore-forming agent, the median particle size of the graphite powder is 10.0 μm, and the purity is 99.9 wt%. First, mix 420g of clay, 430g of talc and 150g of alumina powder with a ball mill for 4h. 1000g of ethanol was used as the dispersion medium, and the amount of alumina grinding balls was 2000g. Then, 1500 g of silicon carbide powder, 1500 g of ethanol, and 3000 g of balls were added to the above mixed material, and ball milling was continued for 8 hours. Afterwards, add 625g of graphite powder in this mixed material again, and ball mill 1h. The slurry was tak...

Embodiment 2

[0025] Raw material and technological process are with embodiment 1. The formula of raw materials is: clay 420g, talc 430g, alumina powder 150g, silicon carbide powder 1500g, graphite powder 0g. The obtained porous ceramic sample has a porosity of 27.6%, a flexural strength of 54.6±3.4MPa, and a thermal expansion coefficient of 3.99×10 -6 K -1 (20~800℃). The pore size distribution is similar to figure 2 The bimodal pattern shown.

Embodiment 3

[0027]Raw material and technological process are with embodiment 1. The formula of raw materials is: clay 630g, talc 645g, alumina powder 225g, silicon carbide powder 1000g, graphite powder 0g. The obtained porous ceramic sample has a porosity of 24.5%, a flexural strength of 40.1±2.2MPa, and a thermal expansion coefficient of 2.60×10 -6 K -1 (20~800℃). The pore size distribution is similar to figure 2 The bimodal pattern shown.

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Abstract

The invention provides a composite porous ceramic of silicon carbide-cordierite, its preparing method and application; during the production of said composite porous ceramic, we take silicon carbide particles as the first phase, and cordierite as the second phase. The cordierite phase is made by clay, talcum and aluminum oxide, etc, through burning at the temperature of about 1400 Deg C; during the formation of cordierite phase, silicon carbide particles are connected together through cordierite phase and form porous ceramic with certain strength; in order to enhance the factor of porosity of said porous ceramic, we need to add some black lead particles as pore-creating agent; the porous ceramic produced in this way is made up of 10-90wt% cordierite and 90-10wt% silicon carbide, whose factor of porosity is 24~65%, pore size distribution is double quotidian mode, and bending strength is 4~55MPa, coefficient of thermal expansion is 1.71~6.26*10-6K-1 (20~800 Deg C), thermal-shock resista nce at the temperature of 1000 Deg C could reach more than 5 times; The porous ceramic provided in said invention could be used to produce wall-flowing mode honeycomb ceramic and enhance the purification capacity to end gas and waste gas.

Description

technical field [0001] The invention relates to a silicon carbide-cordierite composite porous ceramic and a preparation method thereof, belonging to the field of porous ceramics. Background technique [0002] With the extensive use of fuel vehicles such as automobiles, automobile exhaust has become one of the largest sources of pollution in cities. Many countries have enacted laws and regulations to control exhaust emissions from motor vehicles. The use of high-performance exhaust gas purifiers can effectively reduce the pollutant content in automobile exhaust. For diesel engines, the carbon particles in the exhaust gas are the biggest pollutants. Such carbon particles are generally captured by wall-flow honeycomb ceramic filters. However, the trapped carbon particles will gradually block the pores of the honeycomb ceramics, which will not only affect the filtration efficiency of the honeycomb ceramics, but also cause the back pressure of the purifier to increase, thereby...

Claims

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Application Information

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IPC IPC(8): C04B35/577C04B35/565C04B35/195C04B38/00C04B38/06B01D39/20
Inventor 王若钉席红安李勤全慧娟朱苏敏
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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