Influence of matrix structure on mechanical property of Si-M-C-O fiber-bonded ceramics

• Published in: Nihon Seramikkusu Kyōkai gakujutsu ronbunshi Vol. 108; no. 12; pp. 1089 - 1095
• Main Authors: KAJII, Shinji, ISHIKAWA, Toshihiro, MATSUNAGA, Kenji, HOGAMI, Toshihiko, HATANAKA, Kenji
• Format: Journal Article
• Language: Japanese
• Published: Tokyo Nippon seramikkusu kyokai 01.12.2000
• ISSN: 0914-5400
• DOI: 10.2109/jcersj.108.1264_1089

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 sub 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 sub 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 ceramics than in the Si-Zr-C-O one. This was thought to be due to the SiO sub 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.