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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244 MPa,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。
Biomedical intercontiguous (β-TCP + MgO) / Zn-Mg composites were prepared by vacuum infiltration technique by infiltrating Zn-Mg alloy into porous β-TCP + MgO. The microstructure, mechanical properties and corrosion behavior of the composites were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), mechanical properties test, electrochemical and immersion experiments. The results show that the molten Zn-Mg alloy not only infiltrates into the pores of porous β-TCP + MgO framework, but also penetrates into the tendons to form dense composite materials. The Zn-Mg alloy is in close contact with the β-TCP + MgO framework and no reaction layer is found between the alloy and the framework. Compressive strength of the composites reached 244 MPa, which is more than 1000 times the original porous β-TCP + MgO framework strength, which is equivalent to 2/3 of the strength of the Zn-Mg bulk alloy. Electrochemical and immersion tests in simulated body fluids showed that the corrosion resistance of composites is superior to that of Zn-Mg bulk alloys. The corrosion products of the composite surface are mainly Zn (OH) 2. Appropriate mechanical properties and corrosion properties indicate that the (β-TCP + MgO) / Zn-Mg composite prepared by vacuum infiltration method will be a potential bone substitute material.