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Abstract

The present invention provides a process for preparing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula: Mg.sub.xAl.sub.2(1-x)Ti.sub.(1+x)O.sub.5 wherein the value of x is 0.1.ltoreq.x<1. The process comprises a step of sintering a formed product from a raw material mixture comprising 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the above composition formula, and 1 10 parts by weight of an alkali feldspar represented by the composition formula: (Na.sub.yK.sub.1-y)AlSi.sub.3O.sub.8 wherein the value of y is 0.ltoreq.y.ltoreq.1.According to the process of the present invention, a sintered body of aluminum magnesium titanate having stability in continuous use at high temperatures and excellent mechanical strength, while maintaining inherently low thermal expansibility of a sintered body of aluminum magnesium titanate, can be obtained.

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First Claim