Composite cordierite filters

一种过滤器、多晶相的技术，应用在过滤分离、分散颗粒过滤、机器/发动机等方向，能够解决SiC热膨胀率高、抗热冲击性差、提高生产成本等问题，达到峰值温度降低、提高导热性的效果

Inactive Publication Date: 2005-03-30
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiC also suffers from high thermal expansion and poor thermal shock resistance, which can lead to filter cracking during regeneration cycles
Therefore, the current SiC internal combustion engine particulate filter must be designed into a segmented structure to minimize the possibility of cracking during use, but this increases the production cost

Method used

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  • Composite cordierite filters
  • Composite cordierite filters
  • Composite cordierite filters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Tables I and II provide the ingredients and characteristics of the examples of the present invention. A mixture is prepared from recycled cordierite powder, cordierite-forming raw material powder, and polycrystalline silicon carbide powder. Add methylcellulose as binder, sodium stearate as lubricant and graphite or polyethylene particles as pore former. All dry ingredients, including binders, lubricants and pore formers, were weighed in containers and dry blended without the addition of grinding media until macroscopically homogeneous. The mixture was then transferred into a stainless steel grinder and enough distilled water was gradually added to make the mixture plastic. The mixture was extruded to form a honeycomb porous body of about 200 channels per square inch (31 channels per square centimeter) with a channel wall thickness of about 0.010 to 0.023 inches (0.025 to 0.058 cm).

[0037] The extruded porous body can be dried and then calcined in air at a maximum te...

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Abstract

Composite cordierite honeycomb structures especially suitable for diesel exhaust filtration applications comprise a non-oxide polycrystalline phase constituting 10-70% by weight, with the remainder of the ceramic material constituting a cordierite phase, the non-oxide polycrystalline phase being selected from the group consisting of carbides, nitrides, and borides. Preferably the non-oxide phase is either polycrystalline silicon carbide or polycrystalline silicon nitride and has a particle aspect ratio of less than 3. Inventive ceramic bodies are porous with an open porosity of at least 30%, preferably between 40% and 60%, and a median pore size of at least 5 micrometers, more preferably greater than 8 micrometers and less than 12 micrometers.

Description

field of invention [0001] The present invention relates to a multi-channel honeycomb structure suitable for diesel engine exhaust gas filtration, and more particularly to a porous ceramic filter with improved thermal conductivity and thermal shock resistance in internal combustion engine exhaust systems. Background of the invention [0002] Exhaust filters for internal combustion engines require high thermal shock resistance, excellent chemical and mechanical durability in harsh environments, and very good filtration efficiency. [0003] Cordierite Integral Filters have been used in heavy duty engines for nearly forty years. Advantages of these filters include low material consumption and low manufacturing costs. In recent years, due to increasingly stringent environmental pollution control regulations, the demand for filters for diesel passenger cars has increased. However, in passenger cars, especially under "uncontrolled" regeneration conditions (i.e. the onset of combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/02B01D39/20C04B35/195
CPCB01D39/2068Y10S55/30C04B35/56C04B35/565C04B35/58C04B35/584C04B38/0006C04B2111/00793C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/3481C04B2235/3826C04B2235/3873F01N3/0222B01D46/2429Y10T428/24149B01D46/24492B01D46/24491B01D46/24494B01D46/24493C04B38/0054C04B38/0655C04B38/068
Inventor K·P·加德卡里Y·卢J·F·麦齐C·J·沃伦Y·谢
Owner CORNING INC
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