Raman spectroscopy investigation of structural and textural change in C/C composites during braking  

作　　者：雷宝灵 易茂中 徐惠娟 冉丽萍 葛毅成 彭可 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University

出　　处：《Journal of Central South University》2011年第1期29-35,共7页中南大学学报（英文版）

基　　金：Project(2006CB600906) supported by the National Basic Research Program of China

摘　　要：The microstructure and texture of C/C composites with a resin-derived carbon, a rough laminar （RL） pyrocarbon and a smooth laminar pyrocarbon, before and after braking tests, were investigated by Raman spectroscopy. The full width at half maximum （FWHM） of the D-band indicates the amount of defects in the in-plane lattice, while the G-to-D band intensity （peak area） ratios （lC/ID） is used to evaluate the degree of graphitization. The results show that the FWHM of D-band of sample with RL pyrocarbon changes greatly from 36 cm-1 to 168 cm 1 after braking tests, which indicates that a large number of lattice defects are produced on its wear surface. However, the graphitization degree of resin-derived carbon sample rises significantly, because the IC/1D increases from 0.427 to 0.928. Braking tests under normal loading conditions, involving high temperature and high pressure, produce a lot of lattice defects on the wear surface, and induce the graphitization of the surface. Sample with RL pyrocarbon having a low hardness is easy to deform, and has the most lattice defects on the wear surface after braking. While raw materials with resin-derived carbon have the lowest graphitization degree which rises greatly during braking.The microstructure and texture of C/C composites with a resin-derived carbon,a rough laminar(RL) pyrocarbon and a smooth laminar pyrocarbon,before and after braking tests,were investigated by Raman spectroscopy.The full width at half maximum(FWHM) of the D-band indicates the amount of defects in the in-plane lattice,while the G-to-D band intensity(peak area) ratios(IG/ID) is used to evaluate the degree of graphitization.The results show that the FWHM of D-band of sample with RL pyrocarbon changes greatly from 36 cm-1 to 168 cm-1 after braking tests,which indicates that a large number of lattice defects are produced on its wear surface.However,the graphitization degree of resin-derived carbon sample rises significantly,because the IG/ID increases from 0.427 to 0.928.Braking tests under normal loading conditions,involving high temperature and high pressure,produce a lot of lattice defects on the wear surface,and induce the graphitization of the surface.Sample with RL pyrocarbon having a low hardness is easy to deform,and has the most lattice defects on the wear surface after braking.While raw materials with resin-derived carbon have the lowest graphitization degree which rises greatly during braking.

关 键 词：C/C composites Raman spectroscopy graphitization degree BRAKING 

分 类 号：TB332[一般工业技术—材料科学与工程]