C/C-Cu复合材料的压缩性能及其破坏机理  

Compression Performance and Failure Mechanism of C/C-Cu Composites

作　　者：邓朝勇[1] 张红波[1] 尹健[1] 熊翔[1] 王培[1] 孙淼[1] 李万千[2] DENG Chaoyong ZHANG Hongbo YIN Jian XIONG Xiang WANG Pei SUN Miao LI Wanqian(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China Material Science and Engineering School, Central South University of Forestry and Technology, Changsha 410004, China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《材料研究学报》2017年第3期182-186,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51302322);湖南省教育厅青年基金项目(14C1187)~~

摘　　要：以预浸炭布和铜网为原料用模压压制法制备炭纤维体积分数分别为35%、40%和45%左右的三种C/CCu复合材料,用Instron3369力学试验机测试了压缩性能。结果表明:炭纤维的体积分数是影响材料压缩性能的重要因素。在垂直方向上,材料的压缩性能随着炭纤维体积分数的增加而提高。炭纤维体积分数为40%的试样其压缩性能比35%的试样提高了20%,炭纤维体积分数为45%的试样比40%的试样提高了13%,提高的幅度呈先大后小的趋势。而在平行方向上,炭纤维的体积分数对压缩性能的影响没有垂直方向的显著,与试样的致密度有一定的关系。在三种试样中,炭纤维体积分数为45%的试样无论在垂直方向还是平行方向上的压缩强度都最大,分别为190.13 MPa和83.39 MPa。在平行方向和垂直方向上压缩强度的差异表明,C/C-Cu复合材料的压缩性能具有明显的各向异性。关于材料压缩的破坏方式,在垂直压缩受力方向近似沿45°对角线方向时,破坏方式为纤维层、铜网与基体炭的分离以及基体炭的压溃破坏。在平行方向压缩时炭纤维发生褶皱,并在褶皱区域产生拉压应力,使纤维发生折曲或者断裂,最终使炭纤维和基体炭以及基体炭和铜网的界面分层劈裂。Three composites of C/C-Cu i.e. carbon fiber reinforced carbon-copper mesh with different volume fraction（35%,40% and 45%） of carbon fiber were prepared by pressing mold method and then followed by four times impregnating with resin and three times high temperature carbonizing. Their compressive properties were measured on Instron-3369 mechanical testing machine. The effect of volume fraction of carbon fiber on the compressive property was investigated. The results show that the compression performance of C/C-Cu composites increased with increase of volume fraction of carbon fiber in the vertical direction. The compression strength of the composite with 40% carbon fiber was 20% higher than the one with 35%, and that with 45% carbon fiber was 13% higher than the one with 40%. These imply claerly that the compression strength of the composites first increased and then decreased with the increasing carbon fiber content. On the other hand, the carbon fiber volume fraction has no significant effect on the compression performance in the parallel direction. Among others, the composite with 45% carbon fiber has the best compression strength in both the vertical direction and parallel direction, i.e.190.13 MPa and 83.39 MPa respectively. The difference of compressive strength in the vertical direction and parallel direction shows that the compression property of C/C-Cu composites was obviously of anisotropy. By compression stress the composite damaged in the vertical direction along 45° diagonal and in the parallel direction at the interface between the carbon fiber and copper mesh.

关 键 词：C/C-CU复合材料 压缩性能 各向异性 破坏机理 

分 类 号：TB333[一般工业技术—材料科学与工程]