本文利用分析电子显微镜（AEM）研究了在沉积SiC过程中加入游离碳对SiC纤维的微结构影响, 以及微结构与性能的关系。结果显示游离碳主要在两方面影响SiC纤维的微结构。一方面它能够有效的避免在SiC/W芯界面上WO3出现,因而排除氧元素在纤维中存留。另一方面，它能够有效的抑制W芯附近SiC晶粒的长大，并在SiC壳层中形成许多同心的富C层。这些微结构上的变化都有利于提高SiC纤维强度。
Analytical electron microscope (AEM) was applied to investigate the effect of excess free carbon on the microstructure of SiC fiber during SiC deposition growth and relation between microstructure and strength of SiC fiber. The results indicate excess free carbon addition can make effects on microstructure in two aspects. One is that carbon addition can effectively avoid WO3 formation at W/SiC interface, and then, as a result, get rid of oxygen element in fiber; the other is that it can reduce grain size of SiC, especially adjacent to W core. In addition, many concentric C rich layers form within inner SiC sheath. Above changes in microstructure play a positive role in improving fiber’s strength Key words: SiC fiber, analytical electron microscope (AEM), microstructure, strength.
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