Abstract:Various types of deposited carbon textures can be identified by the appearance under optical microscopy with cross-polars.The extinction angle of the deposited carbon in C/C composite can be measured by rotating the analyzer.The problems encountered during the observation by polarized light microscopy are listed.The method to measure the extinction angle is also introduced.In addition,the recently research results on pyrocarbon anisotropy is briefly presented.
[1] PFRANG A,REZNIK B,GERTHSEN D,et al.Comparative study of differently textured pyrolytic carbon layers by atomic force,transmission electron and polarized light microscopy[J].Carbon,2003,41:179-198. [2] OBERLIN AGNES.Pyrocarbons[J].Carbon,2002,40:7-24. [3] PIERSON H O,LIEBERMAN M L.The chemical vapor deposition of carbon on carbon fibers[J].Carbon,1975,13:159-166. [4] ROBONSON P C,BRADBURY S.Qualitative polarized-light microscopy[M].London:Oxford Science Publications,1992.1-108. [5] CLARENCE KARR J R.Analytical methods for coal and coal products(Ⅱ)[M].New York:Academic Press,1978.373-374. [6] BOURRAT X,TROUVAT B,LIMOUSIN G,et al.Pyrocabon anisotropy as measured by electron diffraction and polarized light[J].J Mater Res,2000,15:92-101. [7] BORTCHAGOVSKY E G,REZNIK B,GERTHSEN D,et al.Optical properties of pyrolytic carbon deposits deduced from measurements of the extinction angle by polarized light microscopy[J].Carbon,2003,41:2427-2451. [8] REZNIK B,GERTHSEN D,HUTTINGER K J.Micro-and nanostructure of the carbon matrix of infiltrated carbon fiber felts[J].Carbon,2001,39:215-229. [9] REZNIK B,HUTTINGER K J.On the terminology for pyrolytic carbon[J].Carbon,2002,40:617-636. [10] PIERRE DELHAES.Fibers and Composites:Structure of Pyrocarbons[C].London and New York:World of Carbon,Taylor & Francis,2003.159-187.