钛合金因高比强度广泛应用于航空航天领域,但滑动摩擦性能较差,严重影响相关构件的寿命。表面改性是改善钛合金摩擦行为的常用手段,金属基金刚石复合涂层是其中一个重要研究方向。本文采用喷雾造粒结合冷喷涂在TC18合金表面制备致密的铜基金刚石复合涂层,研究复合粉末的冷喷涂沉积原理以及涂层热处理前后的微观结构与力学性能。结果表明,喷雾干燥制备的金刚石/铜复合粉末达到冷喷涂工艺要求;通过冷喷涂沉积,金刚石弥散分布在涂层中,质量分数为0.74%,且未发生损伤与石墨化;冷喷涂态金刚石/铜涂层具有优异的电导率和较高的硬度;涂层磨损形式为剪切断裂和剥离;600 ℃热处理后复合涂层硬度(HV)降低至95.8,导电率提升至89.3%IACS,涂层的摩擦行为得到改善,磨损率降低41%。
Titanium alloys are widely used in aerospace due to their high specific strength, but the sliding friction performance is poor, which seriously affects the life of related components. Surface modification is a common method to improve the friction behavior of titanium alloy, and the metal-based diamond composite coating is one of the important research directions. In this paper, dense copper-based diamond composite coating was prepared on the surface of TC18 alloy by spray drying powder combined with cold spraying. The principle of cold spray deposition of composite powders and the correlation between microstructure and mechanical properties of coatings before and after heat treatment were explored. The results show that the composite powders prepared by spray drying meet the requirements of cold spraying process. After cold spraying, the diamond is dispersed in the coating with a mass fraction of 0.74%, and no damage or graphitization occurs. Cold sprayed diamond/copper coating shave considerable electrical conductivity and high hardness. The wear mechanism of the coatings is shear fracture and peeling. Afterheat treatment at 600 ℃, the hardness of the composite coating reduces to 95.8 HV and the conductivity increases to 89.3%IACS. The friction behavior of the coating is improved as well. The wear rate of the coating was reduced by 41%.
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