NiO-CoO固溶体の焼結挙動に及ぼす添加Al_2O_3粉末性状の影響

概要

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Sintering behavior of (Ni, Co)O ceramics with 2 mass% Al_2O_3 having various characteristics was investigated. Characteristics of Al_2O_3 powder was changed by heating of a raw Al_2O_3 powder consisting of α and γ phases from 200 to 1200℃ for 5h. The fraction of γ phase in the Al_2O_3 powder decreased remarkably at temperatures between 900 and 1100℃, the specific surface area of the Al_2O_3 powder decreased, and the particle size increased remarkably at temperatures between 1000 and 1100℃. The shrinking behavior of (Ni, Co)O doped with these Al_2O_3 powders was measured from 800 to 1400℃ by TMA. In the temperature region 800 to 1100℃, the shrinkage of CN I, which was defined as (Ni, Co)O with Al_2O_3 treated below 1000℃, was smaller than that of CN II, which was defined as (Ni, Co)O with Al_2O_3 treated above 1100℃. The CN I, however, shrank drastically above 1120℃, and more extensively than CN II above 1200℃. The relative density of CN I sintered at 1300℃ for 10h was more than 98%, while that of CN II was less than 95%.
社団法人日本セラミックス協会の論文
1996-10-01