Oxidation and Crack Healing Behavior of a Fine‐Grained Cr2AlC Ceramic
Oxidation and Crack Healing Behavior of a Fine‐Grained Cr2AlC Ceramic
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DOI：
10.1111/jace.12170
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发表时间：
2013-03
影响因子：
3.9
通讯作者：
Shibo Li;Li-Ou Xiao;G. Song;X. Wu;W. Sloof;S. Zwaag
中科院分区：
文献类型：
--
作者：
Shibo Li;Li-Ou Xiao;G. Song;X. Wu;W. Sloof;S. Zwaag
本工作报告的氧化和裂纹愈合行为的细晶粒（~2 lm）Cr2 AlCMAX相陶瓷。在900°C- 1200°C的温度范围内研究了氧化行为，时间长达100 h。该材料表现出良好的抗氧化性，由于形成了致密而薄的a-Al 2 O3层。对氧化膜的微观结构、成分和厚度进行了表征。系统地研究了它的氧化裂纹愈合行为作为温度，愈合时间和初始裂纹尺寸的函数。该材料显示出优异的愈合性能。裂纹愈合的主要机制是氧化物对裂纹的填充作用。裂纹愈合前后的几何形状，其特征在于通过X射线断层扫描。三点弯曲试验表明，在1100° C时的强度恢复是初始裂纹长度和愈合时间的函数。
This work reports the oxidation and crack healing behavior of a fine-grained (~2 lm) Cr2AlC MAX phase ceramic. The oxidation behavior was investigated in the temperature range 900°C– 1200°C for times up to 100 h. The material showed a good oxidation resistance, owing to the formation of a dense and thin a-Al2O3 layer. The microstructure, composition and thickness of the oxide scale were characterized. Its oxidative crack healing behavior as a function of temperature, healing time, and initial crack size was studied systematically. The material showed excellent healing behavior. The main crack healing mechanism is the filling of the crack by oxides well adhering to the crack faces. The crack geometry before and after healing was characterized by X-ray tomography. Three-point bend tests showed the dependence of strength recovery at 1100° Ca s a function of initial crack length and healing time.