Crack-healing ability of structural ceramics and a new methodology to guarantee the structural integrity using the ability and proof-test
Crack-healing ability of structural ceramics and a new methodology to guarantee the structural integrity using the ability and proof-test
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DOI：
10.1016/j.jeurceramsoc.2004.01.027
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发表时间：
2005-02-01
影响因子：
5.7
通讯作者：
Sato, S
中科院分区：
文献类型：
--
作者：
Ando, K;Furusawa, K;Sato, S
近年来，作者研制出了具有良好自愈合能力的氮化硅、氧化铝和莫来石陶瓷。结果表明，获得高温强度的最佳裂纹愈合条件为：1573K，1h，在空气中，愈合区的强度与母材相当，分别为1573K(Si3N4和Al2O3)和1473K(莫来石)。利用这种良好的裂纹愈合能力，提出了一种保证陶瓷构件可靠性的新方法--裂纹愈合+防裂试验。通过对约200个样本的测试，结果表明，该技术在使用前可以保证可靠性。然而，如果在使用过程中出现裂纹，可靠性将受到严重损害。因此，如果一种材料可以在使用过程中修复裂缝，如果愈合的区域在愈合温度下有足够的强度，那么对于结构的完整性将是非常理想的。基于以上观点，提出了一种利用原位裂纹愈合能力来保证陶瓷构件结构完整性的新方法，并从裂纹愈合行为和验证试验理论的角度讨论了该方法的有效性。(C)2004爱思唯尔有限公司。保留所有权利。
Recently, the authors developed Si3N4, Al2O3 and mullite ceramics with good self-crack-healing abilities. It was shown that the optimized crack-healing condition to get high temperature strength was: 1573 K, I h, in air, and the healed zone exhibited the same strength as the base material up to about 1573 K (Si3N4 and Al2O3) and 1473 K (mullite), respectively. Using this good crack-healing ability, a new methodology to guarantee the reliability of ceramic components [crack-healing + proof test] was proposed. It was shown that reliability could be guaranteed before service by this technique, using about 200 samples. However, if a crack initiated during service, reliability would be severely impaired. Therefore, if a material can heal a crack during service, and if the healed zone has enough strength at the temperature of healing, it would be very desirable for structural integrity. From the above points of view, a new methodology to guarantee the structural integrity of ceramic components using in situ crack-healing ability was proposed and the usefulness is discussed using the test results in terms of crack-healing behavior and proof test theory by the authors. (c) 2004 Elsevier Ltd. All rights reserved.