SINTERING ZIRCONIA SHAPES

摘要

A method of producing a sintered zirconia article which comprises mixing (a) 10 - 50 weight percent of partially stabilized zirconia powder obtained by sintering an admixture of zirconia powder and stabilizing agent therefor and pulverizing the sintered mixture, and (b) 90 - 50 weight percent of zirconia powder and stabilizing agent therefor, shaping the resulting mixture, sintering the shaped mixture, and then heat treating the sintered mixture at a temperature from 1200 DEG to 1500 DEG C. to obtain a sintered zirconia article not more than 70 weight percent of which is of cubic phase crystal structure and which is constituted by 5 - 40 weight percent of particles of 1 to 30 mu diameter and correspondingly 95 - 60 weight of particles of 30 - 300 mu diameter. The sintered article can have sufficiently high density and thermal shock resistance for use as an oxygen sensor.