Effect of Excess Free Carbon on Microstructure and Strength of SiC Fiber

Acta Metall Sin

2007, Vol. 43

Issue (2): 165-170 DOI:

Research Articles

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Effect of Excess Free Carbon on Microstructure and Strength of SiC Fiber

Changyou Guo

东北大学理学院

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Changyou Guo. Effect of Excess Free Carbon on Microstructure and Strength of SiC Fiber. Acta Metall Sin, 2007, 43(2): 165-170 .

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Abstract 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.

Key words: SiC fiber analytical electron microscope (AEM) microstructure strength.

Received: 21 July 2006

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