激光冲击强化对Ti6Al4V钛合金骨板表面改性与摩擦学性能的影响  

Effect of Laser Shock Peening on Surface Modification and Tribological Properties of Ti6Al4V Titanium Alloy Bone Plates

作　　者：李金坤 王守仁[1] 王高琦 杨学锋[1] 杨丽颖[1] Li Jinkun;Wang Shouren;Wang Gaoqi;Yang Xuefeng;Yang Liying(School of Mechanical Engineering,University of Jinan,Jinan,Shandong 250022,China)

机构地区：[1]济南大学机械工程学院,山东济南250022

出　　处：《中国激光》2022年第2期99-109,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(51872122);山东省自然科学基金重点项目(ZR2020KE062);重大基础研究项目(ZR2020ZD06);济南市自主创新团队人才项目(2019GXRC012)。

摘　　要：TiO_(2)纳米管具有纳米级空心盲腔排列结构,既可以提高Ti6Al4V骨板表面的生物相容性,又可以作为抗菌药物的载体,提高基体的抗菌能力。因此,TiO_(2)纳米管层在医用植入物方面具有巨大潜力。目前制备的TiO_(2)纳米管与基体之间的附着力较低,在使用过程中容易脱落;同时,基体的表面特性与TiO_(2)纳米管层之间的关系没有得到充分研究。鉴于此,本文采用激光冲击强化法来改变Ti6Al4V的表面特性,并在改性后的Ti6Al4V表面通过阳极氧化法制备了TiO_(2)纳米管层。在模拟体液条件下,研究了表面改性后骨板的摩擦磨损行为,并分析了表面改性后骨板的表面性能及耐磨性。结果表明:Ti6Al4V经过激光冲击强化后,晶粒细化程度提高;经阳极氧化后形成了排列有序、尺寸较大的纳米管,表面的显微硬度和表面接触角降低,TiO_(2)纳米管层的附着力、生物相容性和耐磨性提高。Objective At present, fractures are treated via internal fixation. Titanium alloy(Ti6 Al4 V) is the primary internal fixation material, which has the advantages of good histocompatibility, biomechanics, and clinical requirements. However, titanium alloy has poor wear resistance and a lack of bioactivity in physiological environments and loading conditions, resulting in clinical orthopedic surgery failure. Researchers both at home and abroad have conducted extensive research on the surface modification of Ti6 Al4 V bone plates. Because of the advantages of simple process, low cost, and controllable film morphology, the in-situ formation of TiO_(2) nanotube layer by anodic oxidation has become an effective method for surface modification of titanium alloy bone plate. During the test, however, the author discovered that there was weak adhesion between the TiO_(2) nanotube layer and the substrate, and it was easy to fall off during use. It is still unclear how to improve the adhesion of the TiO_(2) nanotube layer and achieve morphology control of the nanotube array. In this paper, the surface of the Ti6 Al4 V bone plate was modified by laser shock peening technology, and the TiO_(2) nanotube film was prepared on the modified surface by anodic oxidation method. The mechanism of modification was investigated, and the tribological properties of the bone plate surface were analyzed and evaluated using friction and wear tests, to guide the clinical application of medical materials.Methods Ti6 Al4 V alloy was used in this study. First, the surface of the Ti6 Al4 V bone plate was modified using laser shock peening, and then anodic oxidation was used to create the TiO_(2) nanotube layer on the modified surface. The white light interferometer was then used to measure the surface roughness and profile of the samples before and after surface modification. The surface morphology of the samples was observed by field emission scanning electron microscope. A high-resolution transmission electron microscope was used to examine the s

关 键 词：激光技术 激光冲击强化 阳极氧化 TiO_(2)纳米管层 接骨板 摩擦磨损 

分 类 号：TG174.45[金属学及工艺—金属表面处理]