Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic and preparation method thereof

Abstract

The invention discloses a preparation method of Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic. The preparation method comprises the following steps: taking silicon carbidepowder A, silicon carbide powder B, Al<4>SiC<4> and Al powder as main materials, adding a metal oxide accounting for 5-15 wt% of the main materials as a sintering aid, on the basis of the mass of themain material, dissolving 7.5wt% of cellulose, 3-5 wt% of a surfactant, 1.5-3.5 wt% of vegetable oil and 1-4 wt% of glycerol in equal mass of water to obtain a binding agent, mixing the main materials, the sintering aid and the binding agent uniformly, so as to obtain a mixture; pouring the mixture into a vacuum extruder for forming, performing drying, so as to obtain a honeycomb ceramic green body; heating the honeycomb ceramic green body to 2000-2200 DEG C under an argon atmosphere condition, preserving heat for 1-3 hours; and performing natural cooling, so as to obtain the Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic. According to the Al<4>SiC<4> and Al composite reinforced silicon carbide honeycomb ceramic prepared by the method, raw material utilization rate is high, the production efficiency is high, the structure of the product is wall-flow type, the purification capacity on the waste gas is improved, the microstructure is good, the micropore distribution is uniform, and the mechanical strength is high.

Description

technical field [0001] The invention belongs to the technical field of honeycomb ceramics. Specifically related to Al 4 SiC 4 And Al composite reinforced silicon carbide honeycomb ceramics and a preparation method thereof. Background technique [0002] Developed countries began to control motor vehicle exhaust in the 1970s and formulated emission standards. In order to reduce the harm of diesel vehicle exhaust pollutants, honeycomb ceramic filters are mainly used. With the continuous increase in the exhaust emissions of diesel vehicles for economic construction and residential use, my country's environmental protection requirements are gradually increasing, and higher emission reduction technologies are required. [0003] At present, the preparation methods of wall-flow silicon carbide honeycomb ceramics mainly include adding sintering aids, extrusion molding combination technology and pressure grouting molding technology. The wall-flow silicon carbide honeycomb ceramic...

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Problems solved by technology

The wall-flow silicon carbide honeycomb ceramics obtained by these methods have poor thermal shock resistance, thermal fatigue resistance and working reliability, high firing temperature, uneven micropore size and distribution in the wall, poor product performance and short service life. , high production cost

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