| 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>x</SUB>Al<SUB>2(1-x)</SUB>Ti<SUB>(1+x)</SUB>O<SUB>5 </SUB>wherein the value of x is 0.1<=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>y</SUB>K<SUB>1-y</SUB>)AlSi<SUB>3</SUB>O<SUB>8 </SUB>wherein the value of y is 0<=y<=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. |