【摘要】 从冶金学和生物学两方面综合考虑,熔炼出力学性能可满足硬组织植入材料要求的新型医用镁钙合金,并通过Zn离子注入进行了表面改性。采用显微组织观察和力学性能测试对离子注入前后材料的耐蚀性进行了研究。结果表明,随着钙含量的增加,镁钙合金压缩及弯曲模量提高,而压缩及弯曲强度和变形能力略有下降。Zn离子注入后,镁钙合金表面硬度和弹性模量略有增大。合金化和热处理可有效提高镁钙合金在模拟体液(SBF)中的极化阻力(Rp);离子注入后极化阻力下降,但利于镁钙合金表面稳定保护层的形成而使其耐蚀性提高。更多还原

【Abstract】 New medical Mg-Ca alloys were prepared with a view of comprehensive consideration of biology and metallurgy.The mechanical properties of the alloys could meet the requirement of hard tissue implantation to the materials.The surface modification through Zn ion implantation was carried out.The corrosion resistance of the Mg-Ca alloys before and after ion implantation was analyzed with an observation of metallographic structure and tests of mechanical properties.The results show that the compression and bending modulus of Mg-Ca alloys increases with the increase of Ca concentration,while the compression and bending strength and deformability decreases slightly.The surface hardness and elasticity modulus of the alloys are improved relatively after Zn ion implantation.Rp of Mg-Ca alloy in simulated body fluid(SBF)can be effectively increased by proper alloying and heat treatment,but decreased after ion implantation.The Zn ion implantation is helpful for the formation of surface deposition lay of Mg-Ca alloys and leads to the better corrosion resistance.更多还原