Patent ID: 6410471
Filing Date: 2002-06-25
Classification: C04B

Abstract:
A method for the preparation of a sintered body of a rare earth oxide which comprises the steps of:(a) shaping a powder of the rare earth oxide, of which the D50 value of the particle diameter distribution does not exceed 2.0 &mgr;m, the D90 value of the particle diameter distribution does not exceed 3.0 &mgr;m and the specific surface area is in the range from 5 to 20 m2/g, into a powder compact; and (b) subjecting the powder compact to a heat treatment for sintering at a sintering temperature of 1000Â° C. or higher for at least 1 hour, in which the rate of temperature elevation in the range from 500Â° C. to the sintering temperature does not exceed 500Â° C. per hour and the rate of temperature decrease from the sintering temperature does not exceed 600Â° C. per hour.