Crack healing behaviour and high-temperature strength of mullite/SiC composite ceramics
Crack healing behaviour and high-temperature strength of mullite/SiC composite ceramics
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DOI：
10.1016/s0955-2219(01)00431-9
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发表时间：
2002-08-01
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;Chu, MC;Sato, S
本文讨论了烧结莫来石/碳化硅陶瓷的力学性能及其显著的裂纹愈合行为。对接收光面、热处理光面、预裂纹和预裂纹愈合的4种试样进行了研究。预裂尺寸分别为100 pm和200 pm，呈半椭圆形。结果表明：(a)莫来石/SiC复合陶瓷具有裂纹愈合能力，(b)在空气中放置1 h的最佳愈合条件为1300℃，(c)可愈合的最大裂纹尺寸为直径200 pm的半椭圆裂纹，(d)裂纹愈合区在1200℃以下仍有足够的强度，大部分试样在裂纹愈合区外失效。(C) 2002 Elsevier Science Ltd.版权所有。
Mechanical properties of sintered mullite/SiC ceramics related to its significant crack healing behavior are discussed in this paper. This investigation was made on four kinds of specimens such as as-received smooth, heat treated smooth, pre-cracked and pre-crack healed. Pre-crack sizes were 100 and 200 pm and they were semi-elliptical in shape. The main conclusions were obtained as follows: (a) mullite/SiC composite ceramic has ability to heal crack, (b) the best healing condition was found to be 1300 degreesC in air for I h, (c) maximum crack size able to be healed is semi-elliptical crack of 200 pm in diameter, (d) crack-healed zone has enough strength up to 1200 degreesC and most specimens failed outside the crack-healed zone. (C) 2002 Elsevier Science Ltd. All rights reserved.