颜建辉,王金林,唐思文

• 1:湖南科技大学新材料制备及应用技术研究所

摘要(Abstract)：

为了改善MoSi2力学性能和低温抗氧化性能,选用TiC颗粒来增强补韧MoSi2,通过XRD和SEM表征合成MoSi2基复合材料的微观结构并研究了预氧化对MoSi2基复合材料低温抗氧化性能的影响。结果表明,采用Mo、Si、Ti、C粉末可以自蔓延原位合成20 vol%TiC-MoSi2复合材料。复合材料在500℃氧化240 h增重1.261 mg.cm-2,氧化动力学呈线性关系,生成疏松多孔的氧化层导致"粉化"现象发生。经1200℃预氧化处理,20 vol%TiC-MoSi2复合材料在500℃氧化240 h增重4.83×10-4 mg.cm-2。预氧化处理后的材料表面形成致密的TiO2和SiO2复合膜抑制了TiC-MoSi2材料出现低温"粉化"现象。

关键词(KeyWords)： 原位合成;TiC-MoSi2复合材料;预氧化;低温氧化性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(50405041);; 湖南教育厅资助项目(06C316)

作者(Author): 颜建辉,王金林,唐思文

DOI: 10.13289/j.issn.1009-6264.2011.01.001

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