523 CVD-SiC被覆C/C複合材料の高温負荷下大気中暴露による強度劣化(OS 耐熱材料)

概要

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The tensile tests of the bare(non-coated) and SiC-coated C/C composites were carried out in air at elevated temperatures (RT-1600℃). Specimens were exposed in air at a testing temperature for 600s under a constant strain, 0.13%, and then loaded to the failure in N_2. Experimental results showed that the oxidative damage of the SiC-coated substrate at 1200℃ was induced only just below the coating cracks causing a groove with a semi-circular cross-section. This indicates that the residual strength SiC-coated substrate can be predicted from the apparent remaining cross-section. The increase in the oxidative groove radius was also predicted using the decrease in the applied load during the exposure. The predicted oxidative groove radius showed good agreement with the measured value.
一般社団法人日本機械学会の論文
2000-11-24