真空雰囲気で焼成したTiO_2を添加したAl_2O_3セラミックスの微構造と強度

概要

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Microstructure and mechanical strength of Al_2O_3-TiO_2 ceramics fired in vacuum were studied by X-ray powder diffractometry, scanning electron microscopy, and bending test method. Alumina powder compacts containing 0-4 wt% TiO_2 were sintered at 1500-1700℃ in vacuum (10^<-3>-10^<-4> Pa) and then annealed at 1300℃ in air. The solid solubility of TiO_2 into Al_2O_3 increased with an increase in temperature in vaccum. Beyond the solid solubility limit, TiO_2 or Al_2TiO_5 existed in alumina matrix and restrained the grain growth of alumina. Vacuum-sintered bodies which had high solubilities of Ti were annealed in air. Excess Ti ion existing in Al_2O_3 grains diffused to the grain boundary, and then to the surface of the sintered body, and the annealing treatment slightly decreased the bending strength of sintered bodies.
社団法人日本セラミックス協会の論文
1993-09-01