人工机械瓣材料上沉积类金刚石膜及耐磨性研究  

Growth and Wear Resistance of Diamond-Like Carbon Films on Mechanical Heart Valves

作　　者：叶亮[1] 黄楠[1] 孙鸿[1] 

机构地区：[1]西南交通大学材料先进技术教育部重点实验室,成都610031

出　　处：《真空科学与技术学报》2012年第11期1048-1054,共7页Chinese Journal of Vacuum Science and Technology

基　　金：863计划支持项目(2006AA02A139)

摘　　要：采用磁过滤阴极真空弧源法对低温热解碳瓣叶和瓣环内Ti6Al4V贴片进行了类金刚石膜沉积,并利用模拟摩擦磨损试验检验了薄膜耐磨性,采用X射线光电子能谱检测了薄膜化学键结构。结果表明:利用A3工艺在瓣环内Ti6Al4V贴片上制备了sp3键含量约为66.9%的类金刚石膜,该薄膜在模拟体液中具备较好的耐磨性,同时,缩短每轮镀膜时间降低了薄膜沉积温度,有利于增加薄膜sp3键含量,提高耐磨性;利用B工艺在瓣叶边缘上沉积了sp3键含量约为67.9%的类金刚石膜,该薄膜与A3工艺镀膜后的瓣环内Ti6Al4V贴片配合进行了模拟摩擦磨损试验,体现出较好的耐磨性。The diamond-like carbon films were deposited by filtered cathode arc deposition on the surfaces of the leaflets made of low temperature isotropic pyrolytic carbon,and the Ti6A14V wafers fixed inside the artificial heart valve ring.The influencing growth factors were evaluated.The electronic structures and mechanical properties of the DLC films were characterized with X-ray photoelectron spectroscopy and conventional mechanical probes.The results show that the DLC films significantly improves the wear resistance of the modified surfaces in the simulated body-fluid.The sp3 fraction was found to be 66.9% in DLC films on the Ti6A14V substrate.Besides,shorter deposition time reduced the substrate temperature,resulting in an improvement of the wear resistance and an increase of sp3 fraction.The DLC films,coated on the LTIC leaflet edges with the sp3 fraction of 67.9%,improved the wear resistance when slid against the DLC coated Ti6A14V wafers.

关 键 词：机械瓣 TI6AL4V 类金刚石膜 摩擦磨损 

分 类 号：TB79[一般工业技术—真空技术]