Silicon combined silicon carbide diesel particulate filter and preparation method thereof

Abstract

The invention belongs to the technical field of diesel particulate filters, and particularly relates to a silicon combined silicon carbide diesel particulate filter and a preparation method thereof. The method comprises the following steps: (1) selecting required raw materials, preparing the selected raw materials into mud sections, obtaining a green body in an extrusion forming manner, then carrying out microwave drying, and cutting the dried green body into a single square base body; (2) the single square base body is subjected to a hole punching and plugging process, and a green body is formed; (3) the green body is sequentially subjected to fine degreasing sintering, protective atmosphere sintering and oxidation sintering, and a cooked blank is obtained; and (4) splicing the cooked blanks into a cuboid shape in a bonding manner, and carrying out post-treatment, so as to obtain the finished product. The problems that an existing silicon carbide diesel particulate filter is not prone to firing, high in manufacturing cost, prone to cracking and poor in micropore connectivity are solved, and the production cost of the silicon carbide diesel particulate filter is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of diesel particulate filters, and in particular relates to a silicon-bonded silicon carbide diesel particulate filter and a preparation method thereof. Background technique [0002] With the increasingly stringent requirements of domestic automobile exhaust emissions, the demand for diesel particulate filters is increasing, and the mainstream catalyst carrier materials in the market are mainly cordierite, silicon carbide, aluminum titanate, acicular mullite, etc. Among them, the filter made of acicular mullite has the characteristics of high CTE and easy generation of pollutants such as chloride salt and fluoride, and the sales market is not broad; the filter made of aluminum titanate has low mechanical strength and is easy to package. Broken, and easily decomposed into titanium dioxide, resulting in a rapid increase in the thermal expansion coefficient of the product, resulting in the disadvantage of crack...

AI Technical Summary

Problems solved by technology

The invention solves the problems that the current silicon carbide diesel particle filter is not easy to burn, high production cost, easy to crack, and poor connectivity of micropores, significantly reduces the production cost of the silicon carbide diesel particle filter, and adds silica sol or aluminum sol at the same time One or two of them can achieve the effect of enhanced strength of degreasing and sintered semi-finished products, and the effect of metal silicon melting and wrapping uniformity, which improves production efficiency and product qualification rate

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