摩擦氧化层对TC4合金磨损行为和摩擦系数的影响  

Effect of Tribo-Oxide Layers on Wear Properties and Coefficient of Friction of TC4 Alloy in Fretting

作　　者：何燕妮[1] 俞树荣[1] 李淑欣 尘强 He Yanni;Yu Shurong;Li Shuxin;Chen Qiang(College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo 315211,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《稀有金属材料与工程》2021年第4期1417-1424,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51275225)。

摘　　要：选取TC4合金与3种对偶件微动磨损的完全滑移区,研究摩擦氧化层的形成对TC4合金微动磨损行为和摩擦系数的影响。结果表明:室温下摩擦系数曲线经历阶段性变化,磨损表面未形成摩擦氧化层,磨损率均较高。合金基体加热至260℃时,TC4/GCr15微动摩擦系数曲线最早出现由动态稳定向直线稳定的过渡,最早发生轻微磨损转变和摩擦氧化层的形成,磨损率明显减小,TC4/Si3N4和TC4/Al_(2)O_(3)微动磨损表面未形成摩擦氧化层,磨损率急剧攀升至最大值。继续升温至450℃时,TC4合金与3种对偶件微动磨损均形成不同于基体的摩擦氧化层,磨损率低于室温且达到最小值。TC4合金良好的高温微动磨损性能可归因于分布均匀、连续致密、粘结良好的摩擦氧化层的形成。TC4合金轻微磨损转变前微动损伤由粘着和磨粒磨损控制,轻微磨损转变后由氧化磨损伴随轻微磨粒磨损控制。The gross slip regimes of TC4 alloy against with various counterface materials and temperatures at critical experimental conditions were selected to study the effect of formation of tribo-oxide layers on wear properties and coefficient of friction(COF) of TC4 alloy in fretting wear. Results show that irrespective of tribo-pairs, the coefficient of friction of TC4 alloy has undergone periodic evolutions at room temperature, no tribo-oxide layers have been produced on wearing surfaces and the wear rates are higher. When the samples are heated to 260 ℃, the COF of TC4/GCr15 tribo-pair appears the earliest transition from a "concave-convex" dynamic to an approximately "straight-line" stable state, the earliest severe-mild wear transition occurs and tribo-oxide layer has generated, resulting in the wear rate reduces significantly. However, TC4/Si3N4 and TC4/Al_(2)O_(3) tribo-pairs have no obviously tribo-oxide layers formed, and the wear rate climbs sharply to the maximum value. Severe-mild wear transitions of TC4 alloy against with various counterface materials occur while the samples are heated to 450 ℃, the tribo-oxide layers differed from the matrix are formed on worn surface and the wear rates are lower than room temperature, reaching a minimum value. The excellent wear properties of TC4 alloy in fretting at elevated temperature are attributed to the generation of the formation of tribo-oxide layers with uniform distribution, continuous compressed and good adhesion. The wear mechanism of TC4 alloy is dominated by adhesive and abrasive wear before the severe-mild transition, while controlled by oxidative with slightly abrasive wear after the transition beginning.

关 键 词：TC4合金 微动磨损 摩擦氧化层 磨损转变 摩擦系数 

分 类 号：TG146.23[一般工业技术—材料科学与工程]