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首页> 外文期刊>Journal of Materials Science >Suppression of active-oxidation of Si-C fibers (Hi-Nicalon) under reduced pressure by carbon or silica coating
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Suppression of active-oxidation of Si-C fibers (Hi-Nicalon) under reduced pressure by carbon or silica coating

机译：通过碳或二氧化硅涂层在减压下抑制Si-C纤维（Hi-Nicalon）的活性氧化

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The suppression of the active-oxidation of Si-C fibers (Hi-Nicalon) by carbon or silica coating were investigated at 1773 K under a reduced pressure of 1.32 Pa, through mass change determination, XRD analysis, resistivity measurement, SEM observation and tensile test. The coating of carbon and silica were conducted by heat-treating at 1773 K in CO-CO2 gas mixtures. After exposure under a reduced pressure, the carbon coating formed in pure CO gas remained almost perfect and the retained strength of 1.7 GPa was nearly identical to that in the as-heat treated state. On the other hand, the carbon coatings formed under other conditions and all the silica coatings were completely lost during vacuum exposure. The retained strengths were in the range of 0 to 1.6 GPa. The silica film was found to be ineffective for suppressing the active-oxidation during vacuum exposure. (C) 2004 Kluwer Academic Publishers. [References: 12]
机译：通过质量变化测定，XRD分析，电阻率测量，SEM观察和拉伸，研究了在碳纤维或二氧化硅涂层对Si-C纤维（Hi-Nicalon）的活性氧化抑制作用下，在1.773 K的压力下，其压力为1.32 Pa的情况。测试。碳和二氧化硅的涂层是通过在1773 K下在CO-CO2气体混合物中进行热处理来完成的。在减压下暴露后，在纯CO气体中形成的碳涂层保持几乎完美，并且1.7 GPa的保留强度几乎与在热处理状态下相同。另一方面，在其他条件下形成的碳涂层和所有二氧化硅涂层在真空暴露期间完全消失。保留的强度在0至1.6 GPa的范围内。发现二氧化硅膜对于抑制真空暴露期间的活性氧化是无效的。 （C）2004 Kluwer学术出版社。 [参考：12]

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