Filtering body for capturing soot particles of diesel engine and preparation method thereof

Abstract

The invention discloses a filtering body for capturing soot particles of a diesel engine and a preparation method thereof. The preparation method comprises following steps: evenly mixing silicon carbide coarse powder, silicon carbide fine powder, and a sintering aid to obtain a first mixture; adding methyl cellulose into the first mixture, evenly mixing to obtain a second mixture; adding oleic acid, glycerin, and deionized water into the second mixture, evenly stirring to obtain plastic mud, extruding and moulding the plastic mud to obtain a honeycomb shaped mud blank, drying the honeycomb shaped mud blank, sealing the holes, discharging the coke, sintering the blank at a high temperature, and oxidizing the blank to obtain a re-crystallized silicon carbide filtering body. The prepared filtering body has the advantages of high strength and excellent thermal shock resistant performance. The A-axis compressive strength of the filtering body is greater than 30 MPa. The thermal shock resistant performance is that the filtering body is not cracked after three times at a temperature of 650 DEG C. The severe conditions of diesel engine tail gas post treatment can be satisfied.

Description

technical field [0001] The invention relates to the technical field of automobile tail gas purification, in particular to a filter body for collecting diesel engine soot particles and a preparation method thereof. Background technique [0002] With the intensification of the shortage of global oil resources and the increasing pressure of CO2 emission reduction, there is a trend of diesel engine for vehicle power in foreign countries. At present, more than 40% of the annual output of European cars has adopted diesel engines, and more than 50% of them have been used in countries such as France and Spain. Although compared with gasoline engines, diesel engines are an environmentally friendly engine, compared with gasoline vehicles equipped with three-way catalysts, the exhaust emission pollution of diesel vehicles characterized by nitrogen oxides NOx and soot particulate matter (PM) becomes An important factor restricting its popularization and application. Therefore, the dev...

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Problems solved by technology

At present, the filter body made of cordierite material still has the disadvantages of low softening temperature and insufficient thermal shock resistance, and the filter body made of silicon carbide, cordierite, mullite and other materials also has the problem of too high thermal expansion coefficient

[0003] Chinese invention patents CN100515999C and CN100569700C report a method of preparing recrystallized silicon carbide material wall-flow honeycomb ceramic carrier using pure silicon carbide raw material and vacuum atmosphere sintering method, but its performance is not mentioned

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