医用NiTi合金表面无镍TiO_2层的制备与表征  

Preparation and characterization of Ni-free TiO_2 layer on the surface of medical NiTi alloy

作　　者：朱姿虹 邵红红[1] 王兰[1] 丁红燕 李宗科[1] 祁昌洋 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏省介入医疗器械研究重点实验室,江苏淮安223001

出　　处：《功能材料》2016年第7期7182-7186,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50772044);江苏省介入医疗器械研究重点实验室开放基金资助项目(JR1106)

摘　　要：采用低温去合金化法在镍钛合金表面制备了无镍层。借助扫描电子显微镜(SEM)、X射线衍射仪(XRD)、光电能谱仪(XPS)及电化学工作站等仪器对表层的形貌、结构、元素、耐腐蚀性、生物活性及血液相容性进行了研究。结果表明,镍钛合金经过去合金后,可以在合金表面制备无镍层,耐腐蚀性能也得到了改善,并经过800℃退火可得到金红石型TiO_2;去合金试样表面具有诱导Ca/P沉积的能力,且抗凝血性得到显著提升,凝血时间从基材的45min延长到60min以上。A dealloying treatment method was applied to the surface modification of NiTi alloy so as to prepare a Ni-free layer.The structure and surface morphology of films were systematically studied by X ray diffracmeter（XRD）and scanning electron microscope（SEM）;the elements were analysed by photoelectric spectrometer（XPS）;corrosion resistance property was researched by electrochemical workstation;biocompatibility and blood compatibility were also studied.The result showed that,the dealloying treatment of NiTi alloy at low temperature led to a Ni-free surface layer that the corrosion resistance was improved and the rutile type TiO2 was obtained by annealing at 800 ℃.The alloy surface had the ability to induce the deposition of Ca/P after dealloying treatment and the anticoagulat property was significantly improved that clotting time was extended from 45 min of the substrate to more than60 min.

关 键 词：NITI合金 去镍 耐蚀性 二氧化钛 

分 类 号：TG178[金属学及工艺—金属表面处理]