Microstructures and Bending Property of Mesophase Based C/C Composites withAir Oxidation Process

doi:10.3724/SP.J.1077.2011.00197

Abstract

Abstract: Carbon-carbon composites werefabricated in short period by LPIC (low pressure impregnation carbonization) processwith 225℃ air oxidation using mesophase pitch as precursor. The microstructureswere observed by PLM (polarizingmicroscope ). The bending property and fracture surface were tested byuniversaltesting machineand S EM (scanningelectron microscope), respectively. The results show that the carbon yield isimproved remarkably with 225℃ air oxidation compared withthe samples without air-oxidation. After four cycles of LPIC, the density of C/Ccomposites reaches 1.73 g/cm³. Its bending property is 152.39MPa, which is increased62.87% compared with the samples without air oxidation process. It is concludedthat the C/C composites with air oxidation exhibit pseudo-plastic failure behavior and the sampleswithout air-oxidation rupture from interlays with low bending strength.The microstructures of C/C composites without air oxidation are mainlysmall domains with few mosaic and domain textures. Nevertheless, the composites with 225 ℃ air oxidationpresent domain textures mainly with small domain and flow domain.

Key words: mesophasepitch, C/C composites, microstructures

CLC Number:

TB332

LI Hai-Liang, LI He-Jun, LU Jin-Hua, LI Ke-Zhi, YAO Dong-Jia, WU Heng. Microstructures and Bending Property of Mesophase Based C/C Composites withAir Oxidation Process[J]. Journal of Inorganic Materials, 2011, 26(2): 197-202.

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