乾式混合法によるβ″-Al_2O_3の調整とその特性

概要

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β″-Al_2O_3 has been developed as a solid state electrolyte for the sodium-sulfur battery. Generally, raw material β″-Al_2O_3 was prepared by the wet-mixing process such as zeta-process. In this study, the dry-mixing process as a new safety procedure for the β″-Al_2O_3 raw material was investigated. Homogeneous mixtures were obtained by mixing 1-3 mass% dispersing agent. However, anomalous grain growth was observed in this system during the sintering process. Seed crystal methods were also investigated for depression of anomalous grain growth during the sintering. Microstructure of sintered products was changed considerably by addition of more than 3 mass% seed. The electrical resistivity of β″-Al_2O_3 thus obtained was significantly reduced by the addition less than 5 mass% seed. It is considered that the electrical resistivity of β″-Al_2O_3 is governed by the number of grains and density of sintered products. The mechanical strength of seeded products was markedly higher than unseeded one's.
社団法人日本セラミックス協会の論文
1995-08-01