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中文摘要：
利用热重分析方法考察了不同致密度的MoSi2材料在1000℃的高温氧化行为。试验结果发现：在0-480h的氧化阶段，随着氧化时间的延长，不同致密度的MoSi2材料质量都是增加的；材料的致密度越高，氧化增重得越小；所有不同致密度的材料均未发生“PEST”现象。低致密度MoSi2材料生成的氧化层疏松、多孔且不连续，有利于氧的扩散，加剧了氧化反应。高致密度材料生成的氧化膜连续且致密，阻碍了氧的扩散，材料的氧化程度较小。提高MoSi2材料的致密度有助于增强其高温抗氧化能力。
英文摘要：
The oxidation behaviors of different density of MoSi2 at 1000℃ has been investigated by TGA. Results show that the mass increases with the increase of oxidation time from 0 to 480 hours of different relative density. The higher the relative density, the less is the mass gain of oxidation. Furthermore, the ＂PEST＂ was not found in all MoSi2 materials oxidized for 480h. The loose, porous and discontinuous oxidation film is formed with the low relative density material, Which accelerates oxygen diffusion and leads to aggravation of the oxidation process. On the contrary, the high relative density material forms a compact and continuous oxide film. The mass gain is less because of the film hindering the diffusion of oxygen. The high temperature oxidation resistance of MoSi2 can be improved by increasing its relative density.
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