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利用微弧氧化技术在TC4钛合金表面制备高硬度陶瓷涂层,研究其表面抗微动磨损性能。结果显示,陶瓷涂层主晶相为Al_2TiO_5相,硬度不均匀,由结合层向表面呈现先增大后减小的趋势,最高硬度HV0.5达11 500 MPa,远高于钛合金基体的硬度。微动磨损试验结果表明,陶瓷层的致密层起到主要防护作用。磨损初期阶段,疏松层脱落、细化、堆积同时伴随摩擦副较为严重的磨损;稳定阶段为滑动磨损,致密层磨损轻微,摩擦副磨损严重,钛合金磨屑由摩擦副向致密层转移。
Micro-arc oxidation technology was used to prepare high-hardness ceramic coating on the surface of TC4 titanium alloy to study its anti-fretting wear resistance. The results show that the main phase of ceramic coating is Al 2 Ti 5 phase with non-uniform hardness, and then increases from the bonding layer to the surface first and then decreases. The maximum hardness HV 0.5 reaches 11 500 MPa which is much higher than the hardness of the titanium alloy substrate . Fretting wear test results show that the compact layer of ceramic layer plays a major protective role. At the initial stage of wear, the loose layer sheds, refines and piles up, accompanied by more serious wear of friction pair. In the stable stage of sliding wear, the wear of the dense layer is slight and the wear of the friction pair is serious. The titanium alloy wear debris transfers from the friction pair to the dense layer.