Baohong JIN
材料科学技术（英）
The SiC fiber was prepared by chemical vapour depostion, which consists of tungsten core, SiC layer and carbon coating. The microstructure of the fiber was investigated using Raman spectroscopy, illustrating SiC variation in different region of the fiber. The result shows that the SiC layer can be subdivided into two parts in the morphologies of SiC grains; their sizes increase and their orientations become order with increasing distance from the fiber center. It is demonstrated that the mount of free carbon in the fiber is responsible for the variation of SiC grains in sizes and morphologies. The analysis of Raman spectra shows that the predominant β-SiC has extensive stacking faults within the crystallites and mixes other polytypes and amorphous SiC into the structure in the fiber.
关键词:
Raman spectra
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孟烁
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吕宏军
,
姚草根
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赵丰
,
逄锦程
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.06.012
通过组织观察及图像测量或统计计算分析了两种碳含量(0.022wt％、0.078wt％)对FGH4169合金的影响.结果表明,高碳含量的FGH4169合金平均晶粒尺寸较小,晶粒尺寸差异明显;碳含量对FGH4169合金中碳化物种类及形貌没有明显影响,但改变碳化物的尺寸,高碳含量的FGH4169合金更易形成PPB;低碳含量的FGH4169合金中强化相增多,强化相平均尺寸增大,强化相平均间隙减小,这有利于合金强度的提高.
关键词:
FGH4169
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碳含量
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PPB
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组织
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强化相
