Crack-healing and mechanical behaviour of Al2O3/SiC composites at elevated temperature
Crack-healing and mechanical behaviour of Al2O3/SiC composites at elevated temperature
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DOI：
10.1111/j.1460-2695.2004.00785.x
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发表时间：
2004-07-01
影响因子：
3.7
通讯作者：
Takahashi, K
中科院分区：
文献类型：
--
作者：
Ando, K;Kim, BS;Takahashi, K
研制了裂纹自愈合能力强、强度高、耐热极限温度高的Al_2O_3/SiC复合陶瓷，并对其进行了三点弯曲试验。在每个样品上制作直径为100 μ m的半圆形表面裂纹。裂纹愈合行为进行了系统的研究，作为裂纹愈合温度和愈合时间的函数，裂纹愈合的样品在室温和1373 K的疲劳强度进行了研究。本研究得出四个主要结论。(1)Al_2O_3/SiC复合陶瓷在1273 ~ 1673 K的空气中开裂后具有愈合能力。(2)裂纹愈合试样的强度耐热极限温度为1573 K，在873-1573 K范围内，有68%的试样从裂纹愈合区外断裂。(3)裂纹愈合的样品在室温和1373 K下均表现出非常高的疲劳极限。(4)陶瓷构件具有良好的裂纹自愈合能力，是获得高结构完整性的理想技术。
Alumina/silicon carbide (Al2O3/SiC) composite ceramics with large self-crack-healing ability, high strength and high heat-resistance limit temperature for strength were developed and subjected to three-point bending. A semicircular surface crack 100 mum in diameter was made on each sample. Crack-healing behaviour was systematically studied, as functions of crack-healing temperature and healing time, and the fatigue strengths of the crack-healed sample at room temperature and 1373 K were investigated. Four main conclusions were drawn from the present study. (1) Al2O3/SiC composite ceramics have the ability to heal after cracking from 1273to 1673 K in air. (2) The heat-resistance limit temperature for strength of the crack-healed sample is congruent to1573 K, and congruent to68% of the samples fractured from outside the crack-healed zone in the testing-temperature range 873-1573 K. (3) The crack-healed sample exhibited very high fatigue limit at room temperature and also 1373 K. (4) The large self-crack-healing ability is a desirable technique for the high structural integrity of ceramic component.