10114 SiCウイスカ強化アルミナ/ジルコニアセラミックス混合セラミックスの熱衝撃破壊特性(製造方法と強度,OS10 先進材料の力学と強度)

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  • 10114 Characterization of Thermal Shock Fracture Behavior of SiC Whisker-Reinforced Alumina-Zirconia Ceramics

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Thermal shock fracture behavior in SiC whisker reinforced alumina/zirconia ceramics was evaluated by Disc-on-Rod test in which the central region of heated specimen was quenched by means of contacting with a cool copper rod. The specimen was sintered by a hot press and a precrack was introduced. AE signals during crack growth behavior were detected by AE sensor which was attached on the rod. And using the virtual crack closure method, thermal stress and stress intensity factor were calculated from the temperature distribution measured by IR camera. The fracture resistance at the onset of crack growth was equivalent to monolithic alumina ceramics. On the other hand, the crack growth resistance was much larger than alumina ceramics, then the crack was arrested in the specimen. Consequently, it was demonstrated that the multiple toughening mechanism (crack bridging and phase transformation toughening) contributed the enhancement of crack growth resistance thermal shock.

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