医用可降解Zn-3Cu-xMn合金的制备及性能研究

Preparation and Properties of Biodegradable Zn-3Cu-xMn Alloys

为了探究Zn合金作为生物可降解心血管支架材料的可行性,通过铸造加反向热挤压的方法制备了Zn-3Cu-xMn(x=0,0.5%,1.0%,1.5%)合金,运用金相显微镜、X射线衍射仪、扫描电子显微镜、拉伸测试、电化学测试和SBF浸泡腐蚀实验,探究Mn元素含量变化对Zn合金组织与性能的影响.结果表明,Zn-3Cu-xMn合金组织由Zn基体、CuZn5和MnZn13组成,随合金中Mn含量的升高,抗拉强度升高,屈服强度和延伸率均呈现先增后减的变化趋势,腐蚀速率提高,合金的浸泡腐蚀速率由0.063mm/a增至0.113mm/a.加入Mn元素的合金满足心血管支架材料的机械性能,腐蚀速率高于心血管支架材料的要求,因此,Zn合金具有成为生物可降解心血管支架材料的潜力.

To investigate the feasibility of Zn alloy as biodegradable cardiovascular stent material,Zn-3Cu-xMn(x=0,0.5%,1.0%,1.5%)alloy was prepared by casting and reverse hot extrusion.The effects of Mn content on the microstructure and properties of the alloys were studied by optical metallographic microscope,XRD,SEM,tensile test,electrochemical test and SBF solution immersion corrosion.The results showed that the microstructure of Zn-3Cu-xMn alloy is composed of Zn matrix,CuZn5 and MnZn13.With the increase of Mn content in the alloy,the tensile strength increases,and the yield strength and elongation first increase and then decrease.Electrochemical tests and SBF solution immersion corrosion experiments indicated that the corrosion rate of Zn-3Cu-xMn alloy increases from 0.063mm/a to 0.113mm/a with the increase of Mn content in the alloy.The alloy with Mn element meets the mechanical properties of cardiovascular stent material,and the corrosion rate is higher than the requirements of cardiovascular stent material,so Zn alloy has the potential to become biodegradable cardiovascular stent material.