利用Sol-Gel方法, 通过优化溶胶的配置、纤维提拉过程和干燥烧结等工艺过程,在碳纤维表面制备出均匀的、无裂纹的SiO2涂层. 采用SEM、XPS和TEM表征了碳纤维表面SiO2涂层的结构、形貌、元素分布以及涂层碳纤维/镁基体的界面结构. 结果表明, 涂覆SiO2的碳纤维, 抗氧化能力提高, 拉伸性能略有降低, 但与镁基体复合后其拉伸强度降低了20%. SiO2涂层改善了Mg对碳纤维的润湿能力, 有效地促进了熔融Mg液对碳纤维的浸渗.
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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