Cu含量对生物可降解Zn-Cu合金组织和性能的影响

Effect of Cu Contents on Microstructure and Properties of Biodegradable Zn-Cu Alloys

以Zn粉和Cu粉为原料,采用粉末冶金技术制备生物可降解Zn-Cu合金。研究了Cu含量对生物可降解Zn-Cu合金显微组织、物相组成、抗压强度、耐腐蚀性以及抗菌性能的影响。研究结果表明:当Cu元素加入Zn基体后,Zn-Cu合金的烧结致密度增大。当Cu含量为0.5%—2.5%(质量分数,下同)时,Zn-xCu合金由单相η固溶体组成;当Cu含量为3.0%时,Zn-3.0Cu合金由η和ε两相组成。随着Cu含量的增加,Zn-xCu合金(x=0%-3%)的抗压强度从93.6 MPa提高到170.3 MPa。当Cu含量为2.5%时,Zn-2.5Cu合金的自腐蚀电位达到最大值(-1.0485V),自腐蚀电流密度和稳定腐蚀速率均达到最小值4.6304×10^(-5)A·cm^(-2)和0.076 mm/year。在金黄色葡萄球菌培养液中,与纯Zn相比,Zn-2.5Cu合金抑菌圈直径最大为(29.8±0.3)mm,吸光度值最低为0.20,这说明Zn-2.5Cu合金对金黄色葡萄球菌的抗菌效果更好。

Biodegradable Zn-Cu alloys were prepared by powder metallurgy method with Zn and Cu powder as initial materials.The influence of Cu contents on the microstructure,phase composition,compressive strength,corrosion resistance and antibacterial properties of biodegradable Zn-Cu alloys were studied.The results show that Zn-Cu alloys have higher sintering density when adding Cu elements.The Zn-xCu alloys are composed ofηphase with the Cu content of 0.5%—2.5%,but the Zn-3.0 Cu alloys are composed ofηandεphases with the Cu content of 3.0%.The compressive strength of sintered Zn-xCu alloys(x=0%-3%)increases form 93.6 MPa to 170.3 MPa.The self-corrosion potentials of the Zn-2.5 Cu alloys comes to the maximum of-1.0485 V,but the passivation current density and stable corrosion rate come to the minmum of 4.6304×10^(-5)A·cm^(-2)and 0.076 mm/year,respectively.Compared with pure Zn samples,the inhibition zone size of Zn-2.5 Cu sample comes to the maximum of(29.8±0.3)mm and the absorption value of Zn-2.5 Cu is the lowest of Abs=0.20 in the Staphylococcus aureus culture medium,which shows the antimicrobial effect of Zn-2.5 Cu alloy to S.aureus is better.