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Sintering behavior of (Ni, Co)O ceramics with 2mass% Al2O3 having various characteristics was investigated. Characteristics of Al2O3 powder was changed by heating of a raw Al2O3 powder consisting of α and γ phases from 200 to 1200°C for 5h. The fraction of γ phase in the Al2O3 powder decreased remarkably at temperatures between 900 and 1100°C, the specific surface area of the Al2O3 powder decreased, and the particle size increased remarkably at temperatures between 1000 and 1100°C. The shrinking behavior of (Ni, Co)O doped with these Al2O3 powders was measured from 800 to 1400°C by TMA. In the temperature region 800 to 1100°C, the shrinkage of CN I, which was defined as (Ni, Co)O with Al2O3 treated below 1000°C, was smaller than that of CN II, which was defined as (Ni, Co)O with Al2O3 treated above 1100°C. The CN I, however, shrank drastically above 1120°C, and more extensively than CN II above 1200°C. The relative density of CN I sintered at 1300°C for 10h was more than 98%, while that of CN II was less than 95%.

Influence of Characteristics of Additive Al<sub>2</sub>O<sub>3</sub> Powders on the Sintering Behavior of (Ni, Co)O Ceramics