High‐Temperature Fatigue Strength of Crack‐Healed Al2O3 Toughened by SiC Whiskers
High‐Temperature Fatigue Strength of Crack‐Healed Al2O3 Toughened by SiC Whiskers
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DOI：
10.1111/j.1151-2916.2004.tb07720.x
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发表时间：
2004-07
影响因子：
3.9
通讯作者：
Sang-Kee Lee;Koji Takahashi;M. Yokouchi;H. Suenaga;K. Ando
中科院分区：
文献类型：
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作者：
Sang-Kee Lee;Koji Takahashi;M. Yokouchi;H. Suenaga;K. Ando
对SiC晶须增强Al 2 O3（Al 2 O3/SiC-W）复合材料进行热压处理，研究其裂纹愈合后的高温疲劳强度。在每个试样表面上引入了表面长度为100 μm的半椭圆形表面裂纹。将这些试样在空气中于1300°C下裂纹愈合1 h，并通过三点弯曲系统地研究了室温、900°和1100°C下的静态和循环疲劳强度。在每个测试温度下，裂纹愈合试样的静态和循环疲劳极限均超过平均弯曲强度的70%。裂纹愈合试样的Al 2 O3/SiC-W是不敏感的静态和循环疲劳在室温和高温。因此，裂纹愈合和晶须增强的组合可以在提高高温下的静态和循环疲劳强度方面发挥重要作用。
Al2O3 reinforced by SiC whiskers (Al2O3/SiC-W) was hot-pressed to investigate the fatigue strength of crack-healed specimens at high temperature. Semielliptical surface cracks of 100 μm surface length were introduced on each specimen surface. These specimens were crack-healed at 1300°C for 1 h in air, and static and cyclic fatigue strengths were systematically investigated at room temperature, 900° and 1100°C by three-point bending. The static and cyclic fatigue limits of the crack-healed specimens were more than 70% of the average bending strength at each testing temperature. Crack-healed specimens of Al2O3/SiC-W were not sensitive to static and cyclic fatigue at room temperature and high temperatures. Therefore, the combination of crack-healing and whisker reinforcement can play an important role in increasing static and cyclic fatigue strengths at high temperature.