等离子体基低能氮离子注入钛合金的摩擦行为  

Tribological behavior of plasma-based low-energy nitrogen ion implanted titanium alloy

作　　者：周庄志 滕霖[1] 夏立群[1] 张伟[1] 朱明君[1] ZHOU Zhuangzhi;TENG Lin;XIA Liqun;ZHANG Wei;ZHU Mingjun(AVIC Xi’an Flight Automatic Control Research Institute,Xi’an 710000,China)

机构地区：[1]中国航空工业集团公司西安飞行自动控制研究所,西安710000

出　　处：《中国科技论文》2022年第12期1383-1387,1395,共6页China Sciencepaper

摘　　要：为了研究等离子体基低能氮离子注入钛合金基于电静液作动器作动筒实际工况的摩擦学行为,对热加工态TC4试片进行了表面改性处理,利用扫描电子显微镜(scanning electron microscope,SEM)、粗糙度仪、X射线衍射仪(X-ray diffraction,XRD)、金相显微镜和显微硬度计等对改性层进行表征,利用CETR-UMT-2型摩擦磨损试验机,在模拟不同载荷(18、54、90 N)、不同速度(9、15、20 Hz)和不同摩擦副材料(15-5PH不锈钢、PEEK)下进行摩擦磨损试验。结果表明:在820℃下保温8 h,可在TC4表面形成厚度约为3μm的TiN相改性层,渗氮前后TC4心部组织均为等轴组织;渗氮后表面粗糙度(R_(a))为0.335μm,较渗氮前增大0.3μm,表面显微硬度为992 HV_(0.05),较渗氮前增大了2倍;渗氮后TC4的平均摩擦系数均在0.10~0.15之间,在摩擦试验后表面均未检测到明显的磨痕,摩擦过程的稳定性及表面的耐磨性均得到了显著提升。To study the tribological behavior of plasma-based low-energy nitrogen ion implanted titanium alloy based on actual working conditions of the electro-hydrostatic actuator’s cylinder,hot-worked TC4 test pieces were surface-treated.The scanning electron microscope(SEM),roughness meter,X-ray diffraction(XRD),metallographic microscope and microhardness tester were used to characterize the modified layer.The CETR-UMT-2 friction and wear testing machine was used to simulate friction and wear test under different loads(18 N,54 N,90 N),different speeds(9 Hz,15 Hz,20 Hz)and different friction pair materials(15-5PH stainless steel,PEEK).The results show that after 8 h of heat preservation at 820℃,about 3μm TiN layer is formed on the surface of TC4.The core tissues of TC4 before and after nitriding are both equiaxed.The surface roughness(R_(a))of 0.335μm is 0.3μm larger than before nitriding.The surface microhardness of 992 HV_(0.05) is 2 times larger than before nitriding.The average friction coefficient after nitriding is between 0.10 and 0.15.There are no obvious wear marks on the surface after friction test.The stability of the friction process and the wear resistance of the surface have been significantly improved.

关 键 词：钛合金 等离子体基低能氮离子注入 电静液作动器 耐磨性 

分 类 号：TG166.5[金属学及工艺—热处理]