微弧氧化处理TC4表面微动磨损性能研究

Fretting Wear Behavior of Ceramic Coating Prepared by Micro-arc Oxidation on TC4 Alloy

摘要:

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Al2TiO5相，硬度不均匀，由结合层向表面呈现先增高后降低的趋势，最高硬度达1150 HV0.05，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。

Abstract:

The micro-arc oxidation method is employed to make the highly hardness ceramic layer on the surface of TC4 titanium alloy. The Al2TiO5 is the main crystal phase of the layer. The hardness of the ceramic layer is raised to 1150 HV0.05 and decreased subsequently from interface to surface. It is indicate that the compact layer could protect the substrate effectively in fretting wear test. At the initiate state, loose coating start to break and the severe wear will be occurred in friction pair. While it is stable, the abrasive dust which produced through mashed fruiting body of loose coating will be expelled from the wear zone and the sliding wear turns to be the main style as the compact layer replace loose coating gradually. At the stable state, the metal material transferred from the friction pair to compact layer for the wearability of it. Thus, the compact layer of ceramic layer fabricated by micro-arc oxidation could protect the substrate effectively in fretting wear test.