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318MPa,第一沉积层所受平均应力为436MPa,远高于第二沉积层。
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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第11期2956-2960,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(50871086
51071122)
航空基金项目(2009ZF53062)
中国博士后科学基金项目(20090451393)
凝固技术国家重点实验室自选课题基金项目(KP200906)资助
关键词
SIC纤维
钛基复合材料
拉曼光谱
热残余应力
SiC fiber
Titanium matrix composite
Raman spectra
Thermal residual stress
