SB-05-2(041) Degradation of Tyranno^<TM>ZMI Fiber/Si-Ti-C-O Matrix Composites under Constant Load Conditions at Elevated Temperature(Ceramic, Polymer and Composites)

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The paper presents experimental results for tensile creep behavior of orthogonal 3-D woven Tyranno^<TM> ZMI fiber/Si-Ti-C-O ceramic matrix composites at 1300-1450℃ in air. The composite contained Tyranno^<TM> ZMI (Si 56%, Zr 1%, C 34%, O 9%) fibers with BN coating layer in order to improve interface properties, and exhibited excellent tensile properties at elevated temperature as well as room temperature. For creep stresses between 60 and 140 MPa, the creep rate decreased continuously with time, with no apparent steady-state regime observed at 1300-1450℃. Under the test conditions, the microstructure of Tyranno ZMI fiber and Si-Ti-C-O matrix was unstable, resulting in weight loss and SiC grain growth. As a result, the viscosity of the fiber and matrix increased because of increase in viscosity caused a continuously decreasing creep rate, which made steady-state creep impossible under these conditions.
社団法人日本機械学会の論文
2001-06-03