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利用等离子体喷涂技术在镁合金基体表面制备三种含有不同成分增强剂的Al Si复合涂层,并研究了增强剂对复合涂层微观结构和摩擦磨损行为的影响。结果表明,不同形态的碳材料的添加可以有效的改善涂层的摩擦学性能。多壁碳纳米管(CNT)的添加效果要明显优于片状石墨,仅0.5%的CNTs就使得Al Si复合涂层的摩擦系数明显降低,耐磨性提高60%。Al Si复合涂层的摩擦系数主要取决于材料的减摩性能,而耐磨性能受材料的减摩性和硬度的共同影响,其中减摩性占主导地位。
Three kinds of Al Si composite coatings with different composition enhancers were prepared on the surface of magnesium alloy substrate by plasma spray technique. The effects of reinforcing agent on the microstructure and friction and wear behavior of the composite coating were also studied. The results show that different forms of carbon materials can effectively improve the coating tribological properties. Multi-walled carbon nanotubes (CNTs) added significantly better than flake graphite, only 0.5% of the CNTs makes the Al Si composite coating significantly reduce the friction coefficient, wear resistance increased by 60%. The friction coefficient of Al Si composite coating mainly depends on the antifriction property of the material, while the wear resistance is affected by both the antifriction and the hardness of the material. The antifriction is the dominant factor.