放电等离子法制备Ti-25Ta-4.5Ag合金的微观结构和电化学腐蚀行为研究  

Research on Microstructure and Electrochemical Corrosion Behavior of Ti-25Ta-4.5Ag Alloy Prepared by Spark Plasma Method

作　　者：朱明康[1] 张俊敏[2] 于杰[1] 闻明[2] ZHU Mingkang;ZHANG Junmin;YU Jie;WEN Ming(School of Material Science and Technology,Kunming University of Science and Technology,Kunming 650093,China;Kunming Institute of Precious Metals,Kunming 650106,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明贵金属研究所,云南昆明650106

出　　处：《热加工工艺》2018年第16期48-53,57,共7页Hot Working Technology

基　　金：国家基金委青年基金(51501077);国家基金委地区科学基金(51564025)

摘　　要：采用放电等离子法制备Ti-25Ta-4.5Ag生物合金。通过调节烧结温度优化其微观结构。利用XRD、SEM研究了Ti-25Ta-4.5Ag合金的物相结构和组织形貌。研究了烧结温度对Ti-25Ta-4.5Ag合金在模拟人体溶液中电化学性能的影响。结果表明：Ti-25Ta-4.5Ag烧结产物中有Ti的α相,马氏体α＂相,β相,析出Ag和Ta。Ta在950℃下未完全熔化,Ag在晶界处析出。当烧结温度为850℃时,其稳态开路电位最高：-9 m V,腐蚀电流密度最低：0.352μA·cm^-2,其腐蚀电位最高：-462.472 m V。Ti-25Ta-4.5Ag在850℃烧结下的产物在人体模拟体液中耐腐蚀性能最好,具有良好的应用前景。Ti-25 Ta-4.5 Ag alloy was prepared by discharge plasma method. The microstructure of the alloy was optimized by adjusting the sintering temperature. The phase structure and microstructure of Ti-25 Ta-4.5 Ag alloy were studied by XRD and SEM. The effects of sintering temperatures on the electrochemical properties of Ti-25 Ta-4.5 Ag alloy in the simulated body fluid were studied. The results show that Ti-25 Ta-4.5 Ag sintered products are composed of Ti α phase, martensite α＂phase, β phase, precipitated Ag and Ta. Ta is not completely melted at 950 ℃, and Ag precipitates in the grain boundary.When the sintering temperature is 850 ℃, the steady open circuit potential is the highest, which is-9 m V. The corrosion current density achieves the minimum value,which is 0.352 μA·cm^-2, and the corrosion potential is maximum, which is-462.472 m V. The product sintered at 850 ℃exhibits the best corrosion resistance in the simulated body fluid, which shows good application prospects.

关 键 词：生物材料 钛合金 微观组织 放电等离子烧结 析出相 

分 类 号：TG146.23[一般工业技术—材料科学与工程]