摘要
采用有限元分析方法,对涂层法制备SiC连续纤维增强钛基复合材料的致密化过程进行了探讨,重点分析了致密化过程中纤维排布方式、纤维体积分数以及热压参数(时间、温度)等因素对致密化过程的影响。结果表明,相比四方纤维排布,六方纤维排布有利于基体涂层填充空隙以及能有效减少致密化过程中基体应力;对于四方和六方两种纤维排布方式,纤维体积分数对致密化过程有重要影响,高的纤维体积分数使得致密化过程变得更为困难;涂层法制备SiC连续纤维增强钛复合材料理想的热压温度不应低于750℃,时间应大于0.2h。
The densification behavior of Ti-6Al-4V composite reinforced by SiC fibers under vacuum hot pressing （VHP） was studied by using finite element method （FEM）. The effects of fiber packing geometry, fiber volume fraction and consolidation parameters （temperature and time） on densification behavior were analyzed emphatically during the consolidation process. The results indicate, comparing with the square fiber array, the hexagonal fiber array is benefit to the matrix flow into void and can remarkably decrease the matrix stress during densification. For both square and hexagonal fiber array, fiber volume fraction have a significant effect on the densification. The high fiber volume fraction will cause low consolidation rate. The optimal temperature and time of Ti-6Al-4V matrix-coated fibers composite for vacuum hot pressing must exceed 750℃ and 0.2 h, respectively.
出处
《热加工工艺》
CSCD
北大核心
2008年第6期1-4,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(50371069)
航空科学基金资助项目(04G53044)
关键词
钛基复合材料
SIC纤维
致密化
有限元模拟
titanium matrix composite
SiC fiber
densification
finite element method
