Patent ID: 8920705

Claim:
A process for producing a powder of aluminum titanate-based ceramics, comprising a step of keeping a precursor mixture containing a titanium source powder, an aluminum source powder and a silicon source powder at a temperature range of from 1100° C. to 1350° C. for 3 hours or more, followed by a step of heating the precursor mixture up to a temperature of 1400° C. or more and thereafter firing, at this temperature, the precursor mixture after the keeping to obtain a fired body of aluminum titanate-based ceramics, and a step of pulverizing and classifying the fired body of aluminum titanate-based ceramics, wherein the step of pulverizing and classifying comprises; a step (A) of pulverizing the fired body of aluminum titanate-based ceramics with the application of an impact and classifying the pulverized ceramics to obtain a powder of aluminum titanate-based ceramics having a prescribed grain diameter or less, and a step (B) of re-pulverizing the rest of the pulverized ceramics with the application of an impact and classifying the obtained pulverized ceramics to obtain a powder of aluminum titanate-based ceramics having a prescribed grain diameter or less.