Effect of Matrix Carbon on Compressive Properties of Needled Felt Carbon / Carbon Composites
Carbon/carbon composites with different type of matrix carbon were prepared using needle punched felt and different fabrication schemes.Thermal gradient chemical vapor infiltration of the felt resulted in a final high density of 1.75 g/cm3 with pyrolytic deposition of carbon matrix.A part of the sample was treated at a high temperature of 2500 ℃ for a lower density (1.70 g/cm3) sample with micro and macro cracks in matrix and interface.A part of the lower density sample was further densified using pitch impregnation and carbonization at a pressure of 0.3 MPa.After 04 cycles,a final higher density of 1.85 g/cm3 was achieved with pitch carbon in the interfacial,open pores and crack areas of the composite.The higher density sample was also exposed in oxy-acetylene environment at 2800℃ for 90 seconds.Ablated sample was then tested for compressive strength along with other different density samples.Their compressive behavior was determined and discussed in the light of type of matrix and matrix microstructure.There was a progressive increase in compressive properties with the rise in density and improved interfacial properties.After ablation testing,the higher density sample showed even better properties when compared with the same density sample before ablation testing.
carbon/carbon composites CVI density compressive strength ablation
Shameel FARHAN Chuang WANG Kezhi LI Bingliang LI
School of Materials Science,Northwestern Polytechnical University,Xi”an,China,710072;National Engine Department of Highway & Bridge,Shaanxi Railway Institute,Weinan,China,714000 School of Materials Science,Northwestern Polytechnical University,Xi”an,China,710072
国内会议
重庆
英文
425-430
2011-11-16（万方平台首次上网日期，不代表论文的发表时间）