酸素雰囲気HIP処理したZrO_2セラミックスの破壊強度(<小特集>高圧力小特集)
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概要
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Y-PSZ materials containing 2.5 to 5.0 mol% Y_2O_3 prepared by post hot isostatic pressing under oxygen-containing atmosphere (white-Hipping) were found to retain their original strength even after ageing at temperatures higher than 600℃ for 1000h. In this Paper, the effects of heat-treatment at 1000℃ to 1400℃ on the bend strength and micro-structure of Y-PSZ materials prepared by white-Hipping were reported. The bend strength of 5.0 mol% Y-PSZ material after heat-treating at 1100℃ for 1000h increased greatly from 720 to 1080 MPa. The enhancement of strength was explained by the crack-precipitate interaction (CPI) toughening mechanism. The modulated, tweed or colony structures of fine strip crystals orthogonally crossing each other were observed within the cubic ZrO_2 matrix. The 5.0 mol% Y-PSZ material showed less decrease in strength at temperatures above 600℃, and higher strength at 1000℃ to 1200℃ than the 4.0 mol% Y-PSZ material.
- 1988-02-15
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関連論文
- 酸素雰囲気HIP処理したZrO_2セラミックスの破壊強度(高圧力小特集)
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