Improving oxidation resistance of MoSi2 coating by reinforced with Al2O3 whiskers

被引：32
|
作者：
Wang, Lu [1 ]
Fu, Qiangang [1 ]
Zhao, Fengling [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Carbon Carbon Composites Res Ctr, Xian 710072, Shaanxi, Peoples R China
来源：
INTERMETALLICS | 2018年 / 94卷
基金：
中国国家自然科学基金;
关键词：
Al2O3; Whisker; Reinforce; Oxidation; MoSi2; Toughness; COATED C/C COMPOSITES; MECHANICAL-PROPERTIES; ABLATION RESISTANCE; MICROSTRUCTURE;
D O I：
10.1016/j.intermet.2017.12.023
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
To improve the toughness and oxidation resistance of MoSi2 coating, Al2O3 whiskers and Al2O3 particles were introduced respectively. The geometry of Al2O3 significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 degrees C for 76 h, MoSi2 coating reinforced with 1% Al2O3 whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al2O3 center dot 21SiO(2) glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al2O3 content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.
引用
收藏
页码：106 / 113
页数：8
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