Aluminum titanate honeycomb ceramic material and preparation method thereof

Abstract

The invention relates to an aluminum titanate honeycomb ceramic material and a preparation method thereof. The method comprises the following steps: weighing alumina and talcum powder in proportion, and uniformly stirring alumina and the talcum powder; adding titanium oxide, a barium-containing compound and silica which are weighed in proportion; adding a shaping agent and a pore forming agent which are weighed in proportion, and fully stirring; adding pure water and an extrusion aid which are weighed in proportion, and fully stirring; pugging the above obtained pug, removing impurities, and carrying out extrusion molding to obtain a honeycomb ceramic body; and drying the honeycomb ceramic body, and sintering the dried honeycomb ceramic body to obtain the final aluminum titanate honeycomb ceramic product. The honeycomb ceramic material has the advantages of simple and controllable preparation flow, economical raw material cost and high finished product strength. The aluminum titanate honeycomb ceramic prepared through the method, having an extremely low (near zero) thermal expansion coefficient and 1450DEG C or above refractoriness, can meet requirements of use of the engine exhaust gas purifiers for heat intensity and the thermal shock property.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of modern industry and technology, the demand for ceramic materials with excellent high temperature resistance and thermal shock resistance is becoming more and more urgent. Aluminum titanate (Al 2 Ti0 5 , referred to as AT), because of its high melting point (1860 ° C), low thermal expansion coefficient [K α20～1000℃ =(0.5~1.5)×10 -6 ℃ -1 ], good thermal shock resistance, corrosion resistance, alkali resistance, and relatively low price have attracted much attention. Zhou Linping of Zhejiang University believed in "A Review of Aluminum Titanate Materials" that aluminum titanate is a compound of the pseudobrookite structure group, which belongs to the orthorhombic crystal system, and the thermal expansion coefficients of its crystals in different directions are significantly d...

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Problems solved by technology

[0007] The above patents all solve the problems of thermal decomposition and low mechanical strength of the aluminum titanate sintered body by adjusting the types and proportions of additives, but there are some deficiencies in the above patents: the alkali metal feldspar used will reduce the softening temperature of aluminum titanate and increase Large thermal expansion coefficient, high sintering temperature and high energy consumption

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