Multiple crack healing of a Ti2AlC ceramic
Multiple crack healing of a Ti2AlC ceramic
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Ti2AlC 陶瓷的多重裂纹愈合
DOI：
10.1016/j.jeurceramsoc.2012.01.017
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发表时间：
2012-07-01
影响因子：
5.7
通讯作者：
Sloof, Wim G.
中科院分区：
文献类型：
--
作者：
Li, Shibo;Song, Guiming;Sloof, Wim G.
一种非常有吸引力的自修复材料将是一种将优异的机械性能与多重修复能力相结合的材料。自愈合陶瓷已经研究了40多年，以获得一些性能恢复并防止材料在使用过程中失效，但到目前为止，只有每个损伤部位具有单一愈合事件能力的材料已经实现。在这里，我们报告的自愈合Ti 2AlC陶瓷能够重复修复损坏事件。Ti 2AlC陶瓷在给定位置处重复开裂后实现至少七个愈合循环。在高温下的主要愈合机制是通过形成良好粘附的α-Al 2 O 3和一些金红石TiO 2的存在填充裂缝。对于愈合的样品，弯曲强度恢复或甚至略微超过原始强度。已经量化了多个愈合周期的断裂韧性恢复。(C)2012爱思唯尔有限公司保留所有权利。
A highly attractive self-healing material would be one which combines excellent mechanical properties with a multiple healing capability. Self-healing ceramics have been studied for over 40 years to obtain some performance recovery and to prevent material failure during service, but so far only materials with the capability of single healing event per damage site have been realized. Here we report on a self-healing Ti2AlC ceramic capable of repeatedly repairing damage events. The Ti2AlC ceramic achieves at least seven healing cycles after repeated cracking at a given location. The main healing mechanism at high temperature is the filling of the cracks by the formation well adhering alpha-Al2O3 and the presence of some rutile TiO2. For healed samples, the flexural strength returned or even slightly exceeded the virginal strength. The fracture toughness recovery has been quantified for multiple healing cycles. (C) 2012 Elsevier Ltd. All rights reserved.