Si-M-C-O繊維結合型セラミックスの機械的特性に及ぼすマトリックス構造の影響

概要

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The microstructure and mechanical properties of Si-Ti-C-O and Si-Zr-C-O fiber-bonded ceramics, produced by hot-pressing a laminated material of pre-oxidized Si-(Ti or Zr)-C-O fibers, were investigated. The Si-Ti-C-O fiber-bonded ceramic had a close-packed structure of fibers with a volume fraction of 85% and a SiO_2-based oxide matrix including TiC particles. On the other hand, the Si-Zr-C-O fiber-bonded ceramic consists of a close-packed structure with a volume fraction of 83% and a SiO_2-based oxide matrix without any precipitated phase. Moreover, an interfacial carbon layer is constructed around all the fiber elements in both the fiber-bonded ceramics during the hot-pressing. The high-temperature flexural strength was much higher in the Si-Ti-C-O fiber-bonded ceramic than in the Si-Zr-C-O one. This was thought to be due to the SiO_2-matrix in the Si-Ti-C-O fiber-bonded ceramic, which seems to be refrained from the softening effect by dispersed TiC particles at high temperature.
社団法人日本セラミックス協会の論文
2000-12-01