低温用碳/环氧复合材料性能  

Properties of C/E Composites for Cryogenic Application

作　　者：史汉桥[1] 唐占文[1] 孙建波[1] 崔超[1] 孙宝岗[1] 

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2016年第4期25-28,共4页Aerospace Materials & Technology

摘　　要：针对复合材料在液氮温度下的应用需求,采用RTM工艺制备了几种碳/环氧复合材料,评价了这几种复合材料在80℃、室温和-196℃下的弯曲、压缩、层剪、冲击性能和室温下的GⅠC、GⅡC。结果显示:随着测试温度的降低,复合材料的弯曲强度、压缩强度、冲击强度明显提高;而低温对复合材料模量的影响较小。树脂基体的韧性对复合材料的强度、模量等性能影响不大,而碳纤维种类对复合材料的强度和模量影响较大。树脂基体韧性和碳纤维种类均不改变复合材料力学性能随测试温度变化的趋势。树脂基体韧性和碳纤维种类均会影响复合材料的层间断裂韧性,其中高韧性树脂基体可更加明显地提高复合材料的层间断裂韧性;M40级经编织物/R608-2复合材料GⅠC高达868 J/m2、GⅡC高达2 750 J/m2,但采用高韧性基体的复合材料Tg会有所降低。For the application demand of composites under liquid N2 temperature,several carbon fabric/epoxy composites have been prepared by RTM process. The flexural properties,compression strength,interlamniar shear strength,and impact strength at 80 ℃,RT and-196 ℃ have been tested. GⅠ Cand GⅡ Cat RT have also been tested.Compared with room temperature,the flexural strength,compression strength and impact strength of M40-level braiding fabric/R608-1 composites under-196 ℃ obviously increased,while the effect of cryogenic temperature on the modulus of composites was small. The effects of resin toughness on the strength and modulus of composites were small,while the effects of carbon fiber on the strength and modulus of composites were large. In any case,toughness of resin matrix and variety of carbon fabric could not change the trend of mechanical properties vs temperature. Besides,both toughness of resin matrix and variety of carbon fabric could affect the interlaminar fracture toughness of composites. And high-toughness resin matrix could improve the interlaminar fracture toughness more obviously. The GⅠ Cand GⅡ Cof M40-level braiding fabric/R608-2 composites was as high as 868 J/m2 and 2 750 J/m2,respectively. However,the Tgof composites with high-toughness resin matrix was relatively low.

关 键 词：低温 复合材料 环氧树脂 碳纤维 RTM 

分 类 号：TB332[一般工业技术—材料科学与工程]