HIP処理したSi_3N_4系セラミックスにおける最終緻密化過程とクリープ速度の現象論的関係

概要

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It is shown that final-stage densification and creep behavior of hot-isostatically pressed(HIP)Si_3N_4 materials are phenomenologically related by a simple law independently of the particular mechanism mainly affecting the behaviors. Data from fifteen Si_3N_4-based(HIPed)materials were examined taking as reference material a Si_3N_4 polycrystal densified without external addition of additives. Three main mechanisms were identified and discussed leading to either softening or hardening effects on Si_3N_4. They were grain-boundary softening, solid-solution softening and dispersion hardening as produced by adding to the reference system various additives with or without solubility in Si_3N_4 and hard ceramic dispersoids, respectively. It is phenomenologically recognized and quantitatively established that a common driving force acts in opposite directions during densification and creep processes.
社団法人日本セラミックス協会の論文
1996-03-01