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采用溶胶-凝胶技术在低温氧化处理后碳纤维表面涂覆HA涂层,获得复合改性碳纤维增强HA复合材料。研究并测试了碳纤维的改性工艺、改性后碳纤维表面的微观形貌以及不同碳纤维含量下复合材料的抗弯强度和断裂韧性。结果表明,在400℃氧化30 min的碳纤维表面具有较高的活性和较大的比表面积,在HA溶胶中提拉5次后碳纤维表面形成一层与基体结合性能较好的膜层。复合改性碳纤维可显著提高HA材料的力学性能,当碳纤维含量为3%时,复合改性碳纤维/HA复合材料的抗弯强度达到最大值79.8 MPa,比基体提高了3.2倍。当碳纤维含量为4%时,复合改性碳纤维/HA复合材料的断裂韧度达到最大值1.85 MPa·m1/2,比基体提高了2.3倍。
The HA coating was coated on the surface of carbon fiber by low temperature oxidation treatment with sol-gel technology to obtain the composite modified carbon fiber reinforced HA composite. The modification process of carbon fiber, the micro-morphology of modified carbon fiber surface and the flexural strength and fracture toughness of the composites with different carbon fiber contents were studied and tested. The results showed that the surface of carbon fiber oxidized at 400 ℃ for 30 min had higher activity and larger specific surface area. After being pulled five times in HA sol, the surface of carbon fiber formed a layer with good bonding property with matrix. The composite modified carbon fiber can remarkably improve the mechanical properties of the HA material. When the carbon fiber content is 3%, the flexural strength of the composite modified carbon fiber / HA composite reaches 79.8 MPa, which is 3.2 times higher than that of the matrix. When the carbon fiber content is 4%, the fracture toughness of the composite modified carbon fiber / HA composite reaches the maximum value of 1.85 MPa · m1 / 2, which is 2.3 times higher than that of the matrix.