High-temperature Deformation Behavior of SiC-AlN Ceramic Alloys with Fine-grained Microstructure.

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  • 超微細組織を有するＳｉＣ‐ＡｌＮセラミックアロイの高温変形挙動
  • チョウ ビサイ ソシキ オ ユウスル SiC AlN セラミック アロイ ノ

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Abstract

It was recently found that SiC-AIN solid solutions can be formed over a wide compositional range and better mechanical properties were obtained particularly at room temperature for the SiC-AIN alloys than the end number materials. The present study was intended to investigate the high-temperature strength and deformation behavior of the SiC-AIN solid solution. For this purpose, superfine grained SiC-AIN solid solution and its composite samples were prepared by a reaction HIP-sintering process, and their fracture strength and deformation behavior were evaluated up to 1773K by using a newly-developed Small Punch (SP) testing method. It has been found that high fracture strength is obtained up to 1473K, and below this temperature the load-deflection curve is linear, indicating typically brittle behavior. At 1773K, plastic-like deformation behavior was observed and it intensified with decreasing strain rate. The fractographic observation suggested that the grain boundary sliding enhanced by the ultrafine grained-microstructure was predominately responsible for the appearance of the non-linear deformation at high temperature.

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