Fe_2O_3在钛合金干滑动磨损及摩擦层形成中的作用  

Role of Fe_2O_3 in Dry Sliding Wear of A Titanium Alloy and Formation of Tribo-Layers

作　　者：张秋阳 丁红燕[1,2] 周广宏 王树奇[3] 张临财 夏木建[1,2] 郭啸栋[1] Zhang Qiuyang;Ding Hongyan;Zhou Guanghong;Wang Shuqi;Zhang Lincai;Xia Mujian;Guo Xiaodong(Huaiyin Institute of Technology,Huaian 223003,China;Jiangsu Provincial Key Laboratory for Interventional Medical Devices,Huaian 223003,China;Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]淮阴工学院,江苏淮安223003 [2]江苏省介入医疗器械研究重点实验室,江苏淮安223003 [3]江苏大学,江苏镇江212013

出　　处：《稀有金属材料与工程》2019年第1期159-164,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51701079;51501067);江苏省自然科学基金(BK20140458);江苏省高等学校自然科学研究项目(17KJD430001)

摘　　要：通过在Ti6Al4V合金滑动界面人工添加Fe_2O_3纳米颗粒及其与TiO_2、MoS_2的混合物,试图促进含Fe_2O_3摩擦层在室温下的快速形成;研究了Fe_2O_3、TiO_2、MoS_2在钛合金滑动过程中的作用,并探讨Fe_2O_3相对含量对钛合金磨损行为及磨损机制的影响。结果表明:干滑动下的Ti6Al4V合金耐磨性较差,磨面添加的TiO_2进一步加速磨损,MoS_2一定程度上降低了磨损但并不显著,而Fe_2O_3完全抑制磨损但增大了摩擦系数。高载下,富TiO_2、MoS_2颗粒并不能形成摩擦层,反而聚集在磨面犁沟或者凹坑处,而富Fe_2O_3则容易形成致密的摩擦层覆盖于磨损表面,这证实了钛合金高温耐磨性的改善是由于Fe_2O_3的出现。混合MoS_2+80%(质量分数)Fe_2O_3形成的摩擦层,兼具MoS_2的润滑性和Fe_2O_3的承载能力,给Ti6Al4V合金带来最佳的摩擦磨损性能。Artificial tribo-layers containing Fe2O3 were induced to form at room temperature by supplying Fe2O3 nanoparticle and itsmixtures with TiO2 or MoS2 onto the sliding interfaces of Ti6Al4V alloy and GCr15 steel. The roles of Fe2O3, TiO2 and MoS2 on the slidingwear performance of Ti6Al4V alloy were studied. The effect of the relative content of Fe2O3 in artificial tribo-layer on wear behavior andmechanism of Ti6Al4V alloy was also explored. Results show that Ti6Al4V alloy indeed presents a terrible wear resistance, but it would bechanged by the supplies particles. The wear rate of Ti6Al4V alloy is further accelerated by TiO2, slightly and inappreciably reduced byMoS2, but completely inhibited by Fe2O3. In the case of supplying TiO2-rich or MoS2-rich particles, they are agglomerated into the groovesor pits on worn surfaces, instead of forming a tribo-layer. For Fe2O3-rich particles, an artificial tribo-layer is noticed to form and cover theworn surfaces. It is confirmed that the improved elevated-temperature wear resistance of titanium alloy is attributed to the appearance ofFe2O3. As the particles of MoS2+80 wt% Fe2O3 are supplied, the tribo-layer possesses both of the lubricating property of MoS2 and theload-carrying ability from Fe2O3, which brings the best performance of friction and wear for Ti6Al4V alloy.

关 键 词：钛合金 摩擦层 纳米颗粒 磨损行为 

分 类 号：TH117.1[机械工程—机械设计及理论] TG146.23[一般工业技术—材料科学与工程]