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Thermomechanical Performance of Si–Ti–C–O and Sintered SiC Fiber‐Bonded Ceramics at High Temperatures
Author(s) -
Matsunaga Tadashi,
Kajii Shinji,
Matsunaga Kenji,
Ishikawa Toshihiro,
Lin HuaTay,
Singh Mrityunjay
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02597.x
Subject(s) - materials science , composite material , ceramic , fiber , stress (linguistics) , flexural strength , composite number , fractography , scanning electron microscope , philosophy , linguistics
The stress–temperature‐lifetime response of Si–Ti–C–O fiber‐bonded ceramic (Tyrannohex ™ ) and sintered SiC fiber‐bonded ceramic (SA‐Tyrannohex ™ ) materials as investigated in air from 500 to 1150°C and 500 to 1400°C, respectively. The apparent threshold stress in bending of Si–Ti–C–O fiber‐bonded ceramic with a lifetime of more than 1000 h was about 175 MPa in the 500–1150°C temperature range. In the case of sintered SiC fiber‐bonded ceramic, when the applied stress was below an apparent threshold stress in bending (e.g., ∼225 MPa) for tests conducted ≤1150°C, no failures were observed for lifetimes up to≥1000 h. While, at the temperature of ≥1300°C, the apparent threshold stress in bending decreased to 175 MPa. The decrease in strength was caused by grain growth, which was confirmed from scanning electron microscopic fractography. Both fiber‐bonded ceramics exhibited much higher durability than a commercial SiC/SiC composite at temperatures above 500°C. In addition, results suggested that the sintered SiC fiber‐bonded ceramic (SA‐Tyrannohex) exhibited better mechanical performance than a Hi‐Nicalon/MI SiC composite with BN/SiC fiber coating at temperatures above 1300°C.