Ti-6Al-4V合金热氧化涂层的高温磨损行为  

Elevated-temperature Wear Behavior of Thermal Oxidation Coating on Ti-6Al-4V Alloy

作　　者：周银[1] 李新星[1] 张秋阳[1] 王树奇[1] 

机构地区：[1]江苏大学,江苏镇江212013

出　　处：《稀有金属材料与工程》2017年第6期1689-1693,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51071078);江苏省材料摩擦学重点实验室开放基金(Kjsmcx2012004);江苏省普通高校研究生科研创新项目(CXLX13-653)

摘　　要：通过热氧化/真空扩散处理在Ti-6Al-4V合金表面制备氧化涂层,采用高温磨损试验机对涂层在400℃空气中进行干滑动摩擦磨损试验,研究了涂层的高温磨损行为和机制。结果表明:Ti-6Al-4V合金经氧化/扩散后表面形成氧化物涂层,厚度达250μm。相比于未处理的材料,氧化物涂层的磨损失重非常小,高温耐磨性显著提高。磨损表面均形成摩擦氧化物层,涂层的高耐磨性可归功于硬化的陶瓷涂层与具保护作用的摩擦层的共同作用。主要磨损机制为剥层磨损。Ti-6Al-4V alloy was thermally oxidized followed by vacuum diffusion to prepare an oxidation coating.Dry sliding wear tests of the coating were performed at 400 °C in air on a high-temperature wear tester.The elevated-temperature wear behaviors and mechanism of the coating were studied.The results show that the oxidation coating with a thickness of 250 μm is prepared on Ti-6Al-4V alloy.The wear losses of oxidation coating are extremely low compared with that of the uncoated material,and its elevated-temperature wear resistance is noticeably improved.Tribo-oxide layers are always found to form on worn surfaces.The high wear resistance of the coating could be ascribed to the integrated function of the hardened ceramic coating and protective tribo-layer.The predominant wear mechanism is delamination wear during dry sliding.

关 键 词：TI-6AL-4V合金 氧化涂层 高温磨损 摩擦层 剥层磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]