中文摘要：

利用真空吸渗技术通过将Zn-Mg合金渗透到多孔β-TCP+MgO中制备生物医用相互连续(β-TCP+MgO)/Zn-Mg复合材料。采用扫描电镜(SEM)、X射线衍射仪(XRD)、力学性能测试、电化学和浸泡实验研究复合材料的显微组织、力学性能和腐蚀行为。研究结果表明，熔融Zn.Mg合金不仅渗入到多孔β-TCP+MgO骨架的孔隙中，也渗入到筋中，形成致密的复合材料。Zn.Mg合金与β-TCP+MgO骨架接触紧密，在合金与骨架之间没有发现反应层。复合材料的压缩强度达244MPa，为原始多孔β-TCP+MgO骨架强度的1000倍以上，相当于Zn.Mg大块合金强度的2/3。在模拟体液中的电化学和浸泡测试结果表明，复合材料的耐腐蚀性优于Zn.Mg大块合金的。复合材料表面的腐蚀产物主要是Zn(OH)2。合适的力学性能和腐蚀性能表明真空吸渗法制备的(β-TCP+MgO)/Zn-Mg复合材料将是潜在的骨替代材料。

英文摘要：

The biomedical co-continuous(β-TCP+MgO)/Zn-Mg composite was fabricated by infiltrating Zn-Mg alloy into porousβ-TCP+MgO using suction exsorption technique.The microstructure,mechanical properties and corrosion behaviors of the composite were evaluated by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),mechanical testing,electrochemical and immersion test.It was found that the molten Zn-Mg alloy had infiltrated not only into the pores but also into the struts of the porousβ-TCP+MgO scaffold to form a compact composite.The Zn-Mg alloy contacted to theβ-TCP+MgO scaffold closely,and no reaction layer can be found between the alloy and the scaffold.The compressive strength of the composite was as high as244MPa,which was about1000times higher than that of the original porousβ-TCP+MgO scaffold and2/3of the strength of the Zn-Mg bulk alloy.The electrochemical and immersion tests in simulated body fluid(SBF)solution indicated that the corrosion resistance of the composite was better than that of the Zn-Mg bulk alloy.The corrosion products on the composite surface were mainly Zn(OH)2.Appropriate mechanical and corrosion properties indicated that the(β-TCP+MgO)/Zn?Mg composite fabricated by suction exsorption would be a very promising candidate for bone substitute.