Mg-6%Zn-10%(β-Ca_3(PO_4)_2)复合材料的制备及腐蚀降解行为  

Fabrication and corrosion properties of Mg-6%Zn-10%(β-Ca_3(PO_4)_2) composite

作　　者：陈福文[1,2] 余琨[1,2] 陈良建[2,3] 裴赛敏[3] 汪瑞芳[3] 李少君[1] 胡亚男[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中南大学湘雅三医院,长沙410013

出　　处：《中国有色金属学报》2012年第1期39-44,共6页The Chinese Journal of Nonferrous Metals

基　　金：粉末冶金国家重点实验室开放课题资金项目

摘　　要：以Mg-6%Zn合金为基体、β-Ca3(PO4)2为强化相,采用粉末冶金工艺制备Mg-6%Zn-10%(β-Ca3(PO4)2)复合材料。利用光学显微镜观察复合材料的显微组织,采用X射线衍射仪分析相组成,采用压缩试验评估复合材料力学性能,采用动电位极化法和浸泡实验研究复合材料在模拟体液(SBF)中的腐蚀行为。结果表明:β-Ca3(PO4)2在烧结过程中与基体合金没有发生明显反应;复合材料密度为1.936 g/cm3,压缩强度为339 MPa,弹性模量为24 GPa;添加β-Ca3(PO4)2可降低Mg-6%Zn在SBF中的腐蚀速度;Mg-6%Zn-10%(β-Ca3(PO4)2)复合材料在SBF中的电化学腐蚀速度为2.277 mm/y,浸泡30 d的浸泡腐蚀速度为2.133 mm/y,SBF的pH值随着浸泡时间的延长而上升,最终稳定在10。Using Mg-6%Zn as the matrix and β-Ca3（PO4）2 as reinforcement,the Mg-6%Zn-10%（β-Ca3（PO4）2） bio-composite was fabricated by the powder metallurgy method.The microstructure of Mg-6%Zn-10%（β-Ca3（PO4）2） biocomposite was observed by optical microscopy and the phases were analyzed by X-ray diffractometry.The mechanical properties were evaluated by compression tests.The corrosion behavior of the bio-composite in simulated body fluid（SBF） was studied by potentiodynamic polarization and immersion tests.The results show that the reaction between β-Ca3（PO4）2 particles and Mg-6%Zn matrix during sintering is not observed.The density of the biocomposite is 1.936 g/cm3,the compression strength is 339 MPa and the elastic modulus is 24 GPa.The additive of β-Ca3（PO4）2 reduces the corrosion rate of Mg-6%Zn.The electrochemical corrosion rate of Mg-6%Zn-10%（β-Ca3（PO4）2） is 2.277 mm/y,and the calculated corrosion rate of the biocomposite immersed in SBF for 30 d is 2.133 mm/y.During the immersion test,the pH value of SBF increases gradually,and at last stabilizes at 10.

关 键 词：Mg-6%Zn-10%(β-Ca3(PO)4) 复合材料 腐蚀 力学性能 生物降解 

分 类 号：TG146.22[一般工业技术—材料科学与工程]