纤维表面状态对C/C-SiC复合材料微观组织和相成分的影响

doi:10.7527/S1000-6893.2014.0154

Abstract

Abstract:

In order to investigate the influence of fiber surface state on the microstructure and phase composition of C/C-SiC composites, the surface composition of carbon fibers is modified by heat treatment, and then the fibers with different surface compositions are used to fabricate the C/C-SiC composites via liquid silicon infiltration technique. The surface composition of carbon fibers is measured by XPS (X-ray photoelectron spectroscopy). Results reveal that the oxygen content on the surface of carbon fibers decreases with increasing the treatment temperature. The low oxygen content led to small numbers of oxygen-containing functional groups, resulting in small pore size and a high porosity in C/C perform. After infiltrating the liquid silicon into C/C preform, the morphologies of C/C-SiC composites are observed by scanning electron microscopy(SEM). It is found that the microstructure and phase composition of C/C-SiC composites are quite dependent on the surface composition of carbon fibers. With decreasing the oxygen content on the carbon fiber surface, the SiC content in matrix increased, but the residual Si is reduced. Particularly, in the case of fibers with low oxygen content on the surface, there is almost no residual Si in matrix, and the composites presented a more homogeneous distribution of SiC matrix. Based on the results mentioned above, it can be seen that the microstructure and phase composition of C/C-SiC composites are controlled by the size and distribution of pores, which is closely associated with the surface state of carbon fibers. For the C/C preform with large pore size, during the liquid silicon infiltration, the formation of SiC is dominated by the solution-precipitation reaction and the interface-limited diffusion reaction mechanisms. In the case of C/C preform with small pore size, the formation of SiC is mainly controlled by solution-precipitation reaction mechanism.

Key words: fiber surface state, C/C-SiC, ceramic matrix composites, microstructure, phase composition

CLC Number:

V257
TB332

DAI Jixiang, SHA Jianjun, WANG Shouhao, WANG Yongchang. Influence of fiber surface state on microstructure and phase composition of C/C-SiC composites[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(5): 1704-1712.

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Influence of fiber surface state on microstructure and phase composition of C/C-SiC composites

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