Method for producing aluminum titanate sintered object

Abstract

The present invention provides a process for preparing an aluminum-titanate-based sintered body comprising the step of firing, at 1250 to 1700° C., a formed product prepared from a raw material mixture containing 100 parts by weight of a mixture of TiO 2 and Al 2 O 3 in a weight ratio of TiO 2 :Al 2 O 3 =40:60 to 60:40, and 1 to 15 parts by weight of an alkali feldspar represented by the formula:(Na x K 1-x )AlSi 3 O 8 wherein 0≦x≦1. According to the process of the present invention, it is possible to obtain an aluminum-titanate-based sintered body in which inherent properties of an aluminum titanate, i.e., a low coefficient of thermal expansion and high corrosion resistance are maintained, the mechanical strength thereof is improved, and which can be stably used even under high temperature conditions.

1. A process for preparing an aluminum-titanate-based sintered body comprising the step of firing a formed product at 1250 to 1700° C.,
 the formed product being prepared from a raw material mixture containing: 
 100 parts by weight of a mixture containing TiO 2  and Al 2 O 3  in a weight ratio of TiO 2 : Al 2 O 3 =40:60 to 60:40, and 
 1 to 15 parts by weight of an alkali feldspar represented by the formula: (Na x K 1-x )AlSi 3 O 8  wherein 0≦x≦1 0.15≦x≦0.85. 
 
     
     
       2. The process for preparing an aluminum-titanate-based sintered body according to  claim 1 , wherein the formed product is fired under a reducing atmosphere. 
     
     
       3. The process for preparing an aluminum-titanate-based sintered body according to  claim 1  or  2 , wherein x in the formula: (Na x K 1-x )AlSi 3 O 8  is 0.1≦x≦1.