注射成形生物可降解Fe-Mn合金的制备及性能  

Preparation and properties of biodegradable Fe-Mn alloy by injection molding

作　　者：章也 李东阳[1] 李益民[1] 罗丰华[1] 舒畅[2] 李松[1] ZHANG Ye;LI Dongyang;LI Yimin;LUO Fenghua;SHU Chang;LI Song(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Department of Vascular Surgery of the Second Xiangya Hospital,Central South University,Changsha 410011,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学湘雅二医院血管外科,长沙410011

出　　处：《粉末冶金材料科学与工程》2022年第1期102-110,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：中南大学研究生科研创新项目(1053320210046);长沙市“揭榜挂帅”重大科技项目(kq2102003);战略性新兴产业科技攻关与重大科技成果转化项目(2019GK4002)。

摘　　要：作为生物可降解材料,Fe-Mn合金具备良好的力学性能和生物相容性,受到广泛关注。本文采用注射成形制备Fe-x Mn(x=25,30,35,质量分数,下同)合金,研究烧结时间对Fe-Mn合金显微组织、力学性能和体外静态降解性能的影响。研究表明:烧结时间对Fe-Mn合金相组成无明显影响,而Mn含量影响合金的相组成,Fe-35Mn合金主要由奥氏体组成。注射成形Fe-Mn合金平均晶粒尺寸约为10-20μm,表面Mn损失约为5.8%-10.82%。烧结时间为7 h时,Fe-35Mn合金力学性能最佳,抗拉强度达到358 MPa,伸长率为10.83%,体外静态浸泡降解实验显示,该合金浸泡一天降解速率为1 mm/y,且随腐蚀产物堆积而逐渐降低。Fe-Mn alloy as a kind of biodegradable material has attracted extensive attention owing to its good mechanical properties and biocompatibility. In this paper, the Fe-x Mn(x=25, 30, 35,mass fraction, the same below) alloys were prepared by injection molding. The effect of sintering time on the microstructure, mechanical properties and in vitro static degradation properties of Fe-Mn alloys was studied. The results show that sintering time has few effects on the phase composition of Fe-Mn alloys. However, Mn content affects the phase composition of the alloys. Fe-35 Mn alloys are mainly composed of austenite. The average grain size of Fe-Mn alloys prepared by injection molding is about 10-20 μm,and Mn loss is about 5.8%-10.82% on the surface. When the sintering time is 7 h, the Fe-35 Mn alloy possesses the optimal mechanical properties involving the tensile breaking strength of 358 MPa and the elongation of 10.83%. The 30-day static immersion degradation tests show that the degradation rate of the alloy is 1 mm/y after soaking for one day,and gradually decreases with the accumulation of corrosion products.

关 键 词：注射成形 生物可降解合金 FE-MN合金 力学性能 降解性能 

分 类 号：R318.08[医药卫生—生物医学工程]