NiO-CoO固溶体の焼結挙動に及ぼすAl_2O_3添加の影響

概要

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Sintering behavior of (Ni, Co)O was investigated measuring linear shrinkage as a function of Al_2O_3 addition. Morphological study was also attempted for the samples sintered at 1280℃ for 10h. The added Al_2O_3 reacted with the (Ni, Co)O matrix to form (Ni, Co) Al_2O_4 spinel from 800 to 1200℃. The addition of Al_2O_3 inhibited the growth of (Ni, Co)O particles, and then decreased the linear shrinkage from 800 to 1100℃. Above 1150℃, in contrast to the constant linear shrinkage of (Ni, Co)O, (Ni, Co)O with Al_2O_3 showed steep linear shrinkage behavior. Furthermore, at 1400 ℃, the linear shrinkage for (Ni, Co)O without Al_2O_3 and with Al_2O_3 was 14 and 18%, respectively. The microstructure of the quenched samples showed that number of (Ni, Co) Al_2O_4 spinel precipitates decresed above 1150℃. The average grain size of the samples sintered at 1280℃ for 10h decreased from 11 to 4 μm with increasing Al_2O_3 additive from 0.5 to 8 mass%; the addition of Al_2O_3 inhibited the grain growth of matrix in the final stage of sintering.
社団法人日本セラミックス協会の論文
1996-04-01