光谱学与光谱分析, 2011, 31 (11): 2956, 网络出版: 2011-12-22  

CVD-SiC纤维的拉曼光谱研究

Application of Raman Spectroscopy to Investigation of CVD-SiC Fiber
作者单位
西北工业大学凝固技术国家重点实验室, 陕西 西安710072
摘要
采用激光拉曼光谱对单根CVD-SiC纤维进行了研究, 并与SiCf/Ti-6Al-4V复合材料中SiC纤维的拉曼光谱进行对比分析。 发现SiC纤维的第一沉积层的TO峰峰形尖锐, 表明SiC晶粒较大, 第二沉积层的晶粒较小, 在二个沉积层中分别检测到碳和硅的拉曼峰。 在复合材料中, SiC纤维的TO峰向高波数偏移, 表明复合材料在制备过程中, 因SiC与基体钛合金的热膨胀系数不同而使纤维受到热残余压应力的作用。 通过计算得到复合材料中纤维的热残余应力平均值为318 MPa, 第一沉积层所受平均应力为436MPa, 远高于第二沉积层。
Abstract
The CVD-SiC fiber was studied by using laser Raman spectra. It was found that the sharp TO peak exists in the first SiC deposit layer, indicating the larger SiC grains. But the second SiC deposit layer is with small grains. Raman peak of carbon and silicon was detected respectively in the first and second layer. Compared with that of the single SiC fiber, the TO peaks move to the high wave number for the SiC fiber in SiCf/Ti-6Al-4V composite. It indicates that the compressive thermal residual stress is present in the SiC fiber during the fabrication of the composite because of the mismatched coefficient of thermal expansion between Ti-6Al-4V matrix and SiC fiber. The average thermal residual stress of the SiC fiber in SiCf/Ti-6Al-4V composite was calculated to be 318 MPa and the residual stress in first deposit layer is 436 MPa which is much higher than that in the second layer.

刘斌, 杨延清, 罗贤, 黄斌. CVD-SiC纤维的拉曼光谱研究[J]. 光谱学与光谱分析, 2011, 31(11): 2956. LIU Bin, YANG Yan-qing, LUO Xian, HUANG Bin. Application of Raman Spectroscopy to Investigation of CVD-SiC Fiber[J]. Spectroscopy and Spectral Analysis, 2011, 31(11): 2956.

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