钛合金-不锈钢作动部件耐磨性能提升研究

Research on Improving Wear Resistance of Titanium Alloy and Stainless Steel Actuating Parts

为提升钛合金耐磨性能以满足新一代航空作动系统部件的服役需求,对TC6钛合金试块分别进行无氢渗碳和微弧氧化强化处理,研究钛合金试块–不锈钢试环摩擦副的摩擦磨损性能。结果表明,在载荷及摩擦时间相同的条件下,未经处理的钛合金试块与不锈钢试环发生了严重的黏着摩擦,摩擦系数为0.82,磨损率达到1.34×10^(-4)mm^(3)/(N·m);无氢渗碳处理的钛合金试块与不锈钢试环发生滑动摩擦,摩擦系数约为0.30,磨损率为1.56×10^(-7)mm3/(N·m);微弧氧化处理钛合金试块与不锈钢试环首先发生磨粒摩擦,随后膜层失效发生黏着摩擦,摩擦系数约为0.58,磨损率为5.86×10^(-6)mm^(3)/(N·m)。综上知,TC6钛合金表面硬度低,耐磨性差,经无氢渗碳处理后形成的强化层耐磨性良好,优于微弧氧化强化层。

In order to improve the wear resistance of titanium alloy and meet the service requirements of the new generation aviation actuator system components,TC6 titanium alloy test blocks were subjected to hydrogen-free carburizing and micro-arc oxidation strengthening treatments,and the friction and wear performance of titanium alloy test block and stainless steel test ring friction pair was studied.The results show that under the same load and friction time conditions,the untreated titanium alloy test block experienced severe adhesive friction with the stainless steel test ring,with a friction coefficient of 0.82 and a wear rate of 1.34×10^(-4) mm^(3)/(N·m).The titanium alloy test block without hydrogen-free carburizing treatment experiences sliding friction with the stainless steel test ring,with a friction coefficient of about 0.30 and a wear rate of 1.56×10^(-7) mm^(3)/(N·m).Micro-arc oxidation treatment of titanium alloy test blocks and stainless steel test rings first undergoes abrasive friction,followed by adhesive friction due to film failure.The friction coefficient is about 0.58,and the wear rate is 5.86×10^(-6) mm^(3)/(N·m).TC6 titanium alloy has low surface hardness and poor wear resistance.The strengthened layer formed after hydrogen-free carburizing treatment has good wear resistance,which is superior to the micro-arc oxidation strengthened layer.