Ca和Ag的含量对可降解Zn-Li-Ca-Ag合金的组织和性能的影响

doi:10.11901/1005.3093.2022.582

材料研究学报

2024, Vol. 38

Issue (3): 177-186 DOI: 10.11901/1005.3093.2022.582

研究论文

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Ca和Ag的含量对可降解Zn-Li-Ca-Ag合金的组织和性能的影响

闫俊竹¹^,², 高明², 于晓明¹, 谭丽丽²(

)

^1.沈阳理工大学材料科学与工程学院沈阳 110159
^2.中国科学院金属研究所沈阳 110016

Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag

YAN Junzhu¹^,², GAO Ming², YU Xiaoming¹, TAN Lili²(

)

^1.College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

闫俊竹, 高明, 于晓明, 谭丽丽. Ca和Ag的含量对可降解Zn-Li-Ca-Ag合金的组织和性能的影响[J]. 材料研究学报, 2024, 38(3): 177-186.
Junzhu YAN, Ming GAO, Xiaoming YU, Lili TAN. Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag[J]. Chinese Journal of Materials Research, 2024, 38(3): 177-186.

全文: PDF(16275 KB) HTML

摘要:

制备可降解Zn-Li-Ca-Ag合金，使用光学显微镜(OM)、扫描电镜(SEM)、万能试验机和电化学测试等手段研究了Ca和Ag的含量对这种合金的微观组织、力学性能和耐蚀性能的影响。结果表明：Zn-Li-Ca-Ag合金的微观组织由树枝晶组成，Ca通过第二相强化使锌合金的强度提高，Ag细化枝晶使锌合金的塑性提高。Zn-0.8Li-0.1Ca-0.2Ag合金的抗拉强度达到了186 MPa。Ca和Ag都能提高锌合金的耐蚀性能。

关键词 ：生物材料, 锌合金, 力学性能, 耐蚀性能

Abstract：

Due to the suitable degradation rate and good biocompatibility, Zn-alloys have great potential as biomedical degradable materials. However, the low mechanical properties of pure Zn limit its development as a biomedical material. In this paper, the known degradable Zn-Li-Ca-Ag alloy was further alloyed with different amount of Ca and Ag. The microstructure, mechanical properties and corrosion resistance of the prepared Zn-Li-Ca-Ag alloys were characterized by means of optical microscopy (OM), scanning electron microscopy (SEM), universal testing machine and electrochemical tests. The results showed that the microstructure of the Zn-Li-Ca-Ag alloy was composed of dendrites. The Ca addition can improve the strength of the Zn alloy by second-phase strengthening, and the Ag addition has a positive influence on the plasticity of the Zn alloy by refining the size of the dendrites. Ca has stronger influence on the enhancement of the alloy strength rather than Ag, and amoung others, the Zn-0.8Li-0.1Ca-0.2Ag alloy exhibits the highest tensile strength (186 MPa). The co-addition of Ca and Ag can also improve the corrosion resistance of Zn alloy.

Key words： biomaterials zinc alloy mechanical properties corrosion resistance

收稿日期: 2022-11-03

ZTFLH:

TG146

基金资助:国家重点研发计划(2020YFC1107501);国家自然科学基金(51971222);STS项目(20201600200042);东莞市创新研究团队计划和辽宁省应用基础研究计划(2022020347-JH2/1013)

通讯作者: 谭丽丽，研究员，lltan@imr.ac.cn，研究方向为生物医用可降解金属材料及器械

Corresponding author: TAN Lili, Tel:(024)23971059, E-mail: lltan@imr.ac.cn

作者简介: 闫俊竹，女，1998年生，硕士

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表1 Zn-Li-Ca-Ag合金的化学成分

表2 Hank's溶液的化学成分

图1 铸态Zn-0.8Li-xCa-0.2Ag合金和Zn-0.8Li-0.05Ca-xAg合金的微观组织

图2 铸态Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金中第二相的分布

表3 图2中标记位置的能谱结果

图3 铸态Zn-0.8Li-xCa-0.2Ag合金和Zn-0.8Li-0.05Ca-xAg合金的显微硬度

图4 铸态Zn-0.8Li-xCa-0.2Ag合金(x = 0, 0.05, 0.1%) 和Zn-0.8Li-0.05Ca-xAg合金(x = 0, 0.05, 0.1%)的应力应变曲线和室温拉伸力学性能

图5 铸态Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金的断口形貌

图6 铸态Zn-0.8Li-xCa-0.2Ag合金(x = 0, 0.05, 0.1, mass fraction / %)和Zn-0.8Li-0.05Ca-xAg合金(x = 0, 0.05, 0.1, mass fraction / %)在Hank's溶液中浸泡21 d的pH值的变化曲线和腐蚀速率

图7 铸态Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金在Hank's溶液中浸泡7 d后腐蚀产物的形貌

表4 图7中标记位置的能谱结果

图8 铸态Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金在Hank's溶液中浸泡7 d后腐蚀产物的XRD谱

图9 铸态Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金在Hank's溶液中浸泡21 d去除腐蚀产物后的形貌

图10 Zn-0.8Li-xCa-0.2Ag合金和Zn-0.8Li-0.05Ca-xAg合金的动电位极化曲线，Nyquist曲线和等效拟合电路

表5 极化曲线的拟合结果

图11 Zn-0.8Li-xCa-0.2Ag和Zn-0.8Li-0.05Ca-xAg合金在Hank's中的腐蚀机制示意图

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