strains (about 2%) have been prepared and high perforreported for this graphitization that glassy carbon (GC) mance carbon fiber reinforced composites (CFRP) were constituting the matrix possibly changed to graphite due obtained using these fibers. The fibers have been prepared to the internal stress between the fiber and the matrix from polyacrylonitrile precursors at carbonization tempduring heat treatment. Furthermore, this composite has eratures of the range 1200-1300°C with no subsequent been studied of the microstructure with an aid of oprical surface etching. The structural features of the fibers were and electron microscope and X-ray, and electromagnetic studied and it was revealed that they have (1) large radial property. By preliminary study, the CF/GC composite gradients in Young's modulus, (2) low intensity of X-ray showed to proceed rapid oxidation. Then, oxidation small angle scattering, and (3) low intensity of (002) X-ray behavior for the composite in air was here examined diffraction. The importance of fine structure of carbon comparing with those of various carbons in relation to the fibers in relation to the strength of CFRP is demonstrated. change of the microstructure. 126. The effect of carbon fabric textile properties onphysical and mechanical properties of carbon-carbon composites 132. Traitement de fibres de carbone par oxydation en phase gaxeuse