Continuous carbon fiber (CF) reinforced aluminum (Al) matrix composites have become a potential lightweight material in aerospace and commercial applications. In this work, the alumina (Al₂O₃) coating was uniformly synthesized on the surface of CF by the sol-gel method for improving the wettability and reducing the interfacial reaction between molten Al alloy and CF, while the Al₂O₃-coated CF was subsequently used to fabricate CF/Al composites via pressure infiltration technique. Effects of heat treatment temperature, immersion time, and immersion-drying cycle on the surface morphologies and mechanical properties of Al₂O₃-coated CF were studied, and the influences of the coating thickness on the infiltration quality and the mechanical properties of composites were also investigated by means of the microstructural analysis, interfacial characterizations and tensile property tests. The results show that the Al₂O₃-coated CF with excellent integrity and mechanical properties was obtained at 500 °C for 2 immersion-drying cycles by the immersion time of 5 min per cycle. The Al₂O₃ coating can effectively improve pressure infiltration quality and mechanical properties based on the suitable interfacial bonding strength and good wettability. The optimized Al₂O₃ coating thickness is 100 nm for better improving the mechanical properties of CF/Al composites.

连续碳纤维（CF）增强的铝（Al）基复合材料已成为航空航天和商业应用中潜在的轻质材料。在这项工作中，是氧化铝（Al ₂ ö ₃）涂层通过用于改善润湿性和减少熔融的Al合金和CF之间的界面反应中的溶胶-凝胶法的CF的表面上均匀地合成，而将Al ₂ ö ₃ -随后将涂覆的CF通过压力渗透技术用于制造CF / Al复合材料。热处理温度，浸泡时间和浸泡干燥循环对Al ₂ O ₃表面形貌和力学性能的影响研究了涂层CF，并通过微观结构分析，界面表征和拉伸性能测试，研究了涂层厚度对复合材料渗透性能和力学性能的影响。结果表明，在₂个浸入-干燥循环中，以每循环5分钟的浸入时间，在500°C下获得了具有优异的完整性和机械性能的Al ₂ O ₃包覆的CF。基于合适的界面结合强度和良好的润湿性，Al ₂ O ₃涂层可以有效地改善压力渗透质量和机械性能。优化的Al ₂ O ₃ 涂层厚度为100 nm，以更好地改善CF / Al复合材料的机械性能。