小型パンチ試験法によるSiC-AlN系固溶体と複合体の高温強度の評価

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タイトル別名
  • High Temperature Strength of SiC-AlN Solid Solutions and Composites as Evaluated by Small Punch Tests
  • コガタ パンチ シケンホウ ニ ヨル SiC AlNケイ コヨウタイ ト フク

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抄録

Fully dense compacts of SiC-AlN solid solution and composite were fabricated by the combination of reaction synthesis and hot isostatic pressing (HIP). Their strength and deformation behavior were investigated from room temperature to 1773 K by a Modified Small Punch (MSP) test which has been found to be suitable for the mechanical evaluation of brittle materials.<BR>The SiC-AlN solid solution and composite samples showed higher strength than both of the HIPed SiC (with 0.5 mass%B4C additives) and AlN compacts from room temperature to 1473 K. A decrease in the strength was then observed above 1473 K for the solid solutions containing 5, 10 and 25 mol%AlN, while the SiC, AlN and SiC-AlN composites maintained the room temperature strength up to 1773 K. Nonlinear deformation occurred at 1773 K in the solid solution samples with the composition of SiC-25 mol%AlN, being accompanied by a drastic drop in strength. Considering the fact that single-phase SiC-AlN solid solutions have a fine microstructure of uniform grain size, the nonlinear deformation is due to grain boundary sliding. On the other hand, the SiC-50, 70 mol%AlN composites maintained their high strengths up to 1773 K, probably because coarser grains with AlN-rich composition in the fine-grained matrix effectively suppressed the grain boundary sliding. For the single-phase SiC-AlN solid solutions, moderate grain growth is needed to achieve high strength at elevated temperature.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 56 (12), 1450-1456, 1992

    公益社団法人 日本金属学会

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