Crack-healing behavior of Al2O3 toughened by SiC whiskers
Crack-healing behavior of Al2O3 toughened by SiC whiskers
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DOI：
10.1111/j.1151-2916.2003.tb03622.x
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发表时间：
2003-12-01
影响因子：
3.9
通讯作者：
Ando, K
中科院分区：
文献类型：
--
作者：
Takahashi, K;Yokouchi, M;Ando, K
采用热压法制备了SiC晶须增强Al_2O_3复合材料（Al_2O_3/SiC-W），并对其裂纹愈合行为进行了研究。半椭圆形的表面裂纹的表面长度为100微米，采用维氏压头。将含有预裂纹的试样在空气中于1000 ℃ ~ 1300 ℃的温度下裂纹愈合1 h，并在室温和400 ℃ ~ 1300 ℃的高温下通过三点弯曲试验测量其强度。结果表明，Al_2O_3/SiC-W复合材料具有良好的裂纹愈合能力。在1200 ℃或1300 ℃空气中加热1h，可使2c = 100 μ m的表面裂纹愈合。还测定了材料的断裂韧性。正如预期的那样，SiC晶须使其Al 2 O3更强硬。
Al2O3 reinforced by SiC whiskers (Al2O3/SiC-W) was hot-pressed to investigate the crack-healing behavior. Semielliptical surface cracks of 100 mum in surface length were introduced using a Vickers indenter. The specimens containing precracks were crack-healed at temperatures between 1000degrees and 1300degreesC for 1 h in air, and their strengths were measured by three-point bending tests at room temperature and elevated temperatures between 400degrees and 1300degreesC. The results show that Al2O3/SiC-W possesses considerable crack-healing ability. The surface cracks with length of 2c = 100 mum could be healed by crack-healing at 1200degrees or 1300degreesC for 1 h in air. Fracture toughness of the material was also determined. As expected, the SiC whiskers made their Al2O3 tougher.