Abstract

Experimental data on the effect of the ambient atmosphere (a vacuum or argon) on the phase composition of silicon carbide fibers formed upon the siliconization of carbon felt are presented. The major phases produced in the siliconization of carbon felt are β-SiC (3C) in vacuo and α-SiC (6H) in the argon atmosphere. When carbon felt is siliconized in vacuo, residual silicon is present on the surface of the silicon carbide felt fibers. The ambient atmosphere determines the nature of the siliconization process at 1650°C: in vacuo, SiC is formed due to the reaction of carbon fibers with the silicon melt wetting them, while in argon, it is formed due mainly to the reaction with vaporous silicon.

中文翻译：

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气氛对碳化硅纤维形成对碳毡硅化的影响

摘要

提供了环境气氛（真空或氩气）对碳毡硅化时形成的碳化硅纤维的相组成影响的实验数据。碳毡硅化过程中产生的主要相是真空中的 β-SiC (3C) 和氩气气氛中的 α-SiC (6H)。当碳毡在真空中硅化时，残留的硅存在于碳化硅毡纤维的表面上。环境气氛决定了 1650°C 时硅化过程的性质：在真空中，由于碳纤维与硅熔体的润湿反应而形成 SiC，而在氩气中，它主要是由于与汽态硅的反应而形成.