用XPS、BET 和EPR 方法对五种SiC 晶须的表面成分、比表面、Si 悬挂键进行了测定。用TG-DTA 方法研究了表面涂层和未涂层的SiC 晶须的抗氧化性能。结果表明:SiC 晶须的抗氧化性主要取决于起始表面氧含量;在表面涂覆Al_2O_3,SiO_2和Mullite 后,SiC 晶须无论是表面抗氧化性和体积抗氧化性均得到显著改善。表面抗氧化性的改善是由于涂层使SiC 表面Si 悬挂键减少,而体积抗氧化性改善是由于涂层增加了氧扩散阻力。
The surface compositions,silicon dangling bonds and specific areas of five kindsof SiC whiskers were measured by XPS,EPR and BET respectively.The oxidation behaviour ofthe SiC whiskers containing and not containing coatings were studied by using of TG-DTA
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