2D-C/SiC高温弹性模量的预测  

PREDICTION OF ELASTIC MODULUS AT ELEVATED TEMPERATURE FOR 2D-C /SIC

作　　者：张歌[1] 张程煜[1] 乔生儒[1] 韩栋[1] 李玫[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点试验室,西安710072

出　　处：《机械强度》2013年第1期94-99,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金(50772089;51172183);高等学校学科创新引智计划(B08040);新世纪优秀人才支持计划(NCET-08-0460);高等学校博士学科点专项科研基金(20070699007)资助~~

摘　　要：平纹碳布(正交纤维)经过叠层得到二维纤维预制体,预制体通过化学气相渗透法沉积热解碳界面和SiC基体,得到二维编织碳纤维增强碳化硅复合材料(2D-C/SiC)。将纤维与热解碳层进行一体化考虑,把基体与孔隙进行一体化考虑,分别计算纤维的就位模量和基体的有效模量;考虑基体和纤维的模量随温度的变化,在混合定则的基础上,将横向纤维当作孔隙、将横向纤维当作基体和1/2混合定则对2D-C/SiC进行三种简化,预测2D-C/SiC复合材料在室温和高温下的弹性模量。与试验结果进行比较发现,利用1/2混合定则预测的2D-C/SiC在室温和高温下的弹性模量与试验值最接近。A two-dimensional （2D） layered fiber preform was gained from plain-woven （00/90~） carbon fabrics. Pyrocarbon interphase and SiC matrix were deposited by chemical vapor infiltration. The in-situ moduli of the fibers and effective moduli of the matrix at different temperatures were calculated, where the pyrocarbon interphase was considered as fibers and the pores were included in the matrix. The changes of moduli for the matrix and fibers with temperature were taken into account. Based on the rule of mixture, the moduli of 2D-C/SiC at room and elevated temperature were predicted by three simple ways： taking the transverse fibers as the pores, taking the transverse fibers as the matrix and 1/2 rule of mixture. The moduli of 2D-C/SiC at room and elevated temperature predicted by 1/2 rule of mixture are almost close to the experimental results.

关 键 词：温度2D-C SIC复合材料 就位模量 有效模量1 2混合定则 

分 类 号：TB332[一般工业技术—材料科学与工程] TB302