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FABRICATION AND PROPERTIES OF SiO2 COATING ON CARBON FIBRE |
Li Kun;;;; |
中国科学院金属所 |
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Cite this article:
Li Kun. FABRICATION AND PROPERTIES OF SiO2 COATING ON CARBON FIBRE. Acta Metall Sin, 2007, 43(12): 1282-1286 .
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Abstract A Sol-Gel method was applied to fabricate SiO2 coating on the surface of carbon fibre. By controlling the component of the Sol, the dipping speed, the heating and sintering processes, a crack-free SiO2 coating was obtained. SEM and XPS were used to characterize the structure, morphology and elemental distribution of SiO2 coating, also the interface between carbon fibre and magnesium matrix was characterized by TEM. The oxidation resistance and mechanical properties of carbon fibre with and without SiO2 coating were investigated, the results showed that SiO2 coating enhanced the oxidation resistance ability of carbon fibre, and also SiO2 coating had little influence on its mechanical properties. However, the tensile strength of coated carbon fibre had degraded to 80% after embedded in Mg matrix. Carbon fibre reinforced Mg-based (Cf/Mg) composite was fabricated by gas pressure infiltration process and the results indicated that SiO2 coating could effectively promote the wetting between the molten Mg and carbon fibre.
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Received: 12 February 2007
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