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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。
Considering both metallurgy and biology, a new type of medical Mg-Ca alloy with mechanical properties that can meet the requirements of hard tissue implants was melted and surface modified by Zn ion implantation. The corrosion resistance of the material before and after ion implantation was studied by microstructure observation and mechanical property test. The results show that with the increase of calcium content, the compressive and flexural modulus of magnesium-calcium alloy increase, while the compressive and flexural strength and deformation capacity decrease slightly. After Zn ion implantation, the surface hardness and elastic modulus of Mg-Ca alloy slightly increase. Alloying and heat treatment can effectively improve the polarization resistance (Rp) of magnesium-calcium alloy in simulated body fluid (SBF); the polarization resistance decreases after ion implantation, but it is conducive to the formation of a stable protective layer on the surface of magnesium-calcium alloy to make it corrosion resistance improve.