类金刚石涂层的厚度对生物医用NiTi合金力学性能和腐蚀行为的影响(英文)  

Effects of Diamond-like Carbon Coatings with Different Thickness on Mechanical Properties and Corrosion Behavior of Biomedical NiTi Alloy

作　　者：杭瑞强[1] 马胜利[1] Paul K.Chu 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]香港城市大学,中国香港九龙

出　　处：《稀有金属材料与工程》2012年第9期1505-1510,共6页Rare Metal Materials and Engineering

基　　金：Joint Project of Guangdong Province and Ministry of Education of China(2007A090302087);City University of HongKong Applied Research Grant(ARG)(9667028)

摘　　要：采用电弧增强磁控溅射技术在生物医用NiTi合金表面沉积253~1880nm厚的类金刚石涂层。用轮廓仪、划擦仪、摩擦磨损仪和电化学工作站等检测涂层的力学性能和腐蚀行为。结果发现,厚度在700~1000nm之间的涂层具有较低的残余应力、较高的膜基结合力、长的磨损寿命和良好的耐腐蚀性。因此,更适合于作为生物医用NiTi合金的保护性涂层,同时也对NiTi合金表面类金刚石涂层的厚度对其力学性能和腐蚀行为的影响机制进行探讨。Diamond-like carbon （DLC） coatings with the thickness between 253-1880 nm were prepared on NiTi alloy by arc enhanced magnetron sputtering （AEMS）. Surface profilometry, scratch tests, tribometry, and electrochemical tests were conducted to determine the mechanical properties and the corrosion behavior of the DLC-coated NiTi alloy, and it is found that DLC coatings with thickness between 700 and 1000 nm have moderate residual stress, high critical load, long wear life and good corrosion resis- tance. So DLC coatings with thickness between 700 and 1000 nm are suitable for improving the mechanical properties and corrosion resistance of biomedical NiTi alloy. The associated mechanisms were also discussed in detail.

关 键 词：类金刚石 镍钛合金 力学性能 腐蚀行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]