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为了改善Ti-Nb-Zr合金的生物活性,采用放电等离子烧结(SPS)制备了Ti-35Nb-7Zr-xHA(羟基磷灰石,x=5,10,15,20,质量分数,%)复合材料。借助XRD、SEM、力学测试以及电化学测试手段研究了HA含量对复合材料显微组织、力学性能和腐蚀性能。结果表明,所有复合材料的物相主要由β-Ti基体、α-Ti和金属-陶瓷相(CaO,CaTiO_3,CaZrO_3,TixPy等)组成,此外,含15%HA和20%HA的复合材料中出现了少量残余的HA;随着HA含量的增加,复合材料的抗压强度均高于1400MPa,复合材料(5%-15%HA)的弹性模量呈较小变化趋势(46-52GPa),更加接近人骨的弹性模量。在Hank’s溶液中的电化学试验表明,HA含量为15%时,复合材料的钝化电流密度和腐蚀电流密度较低,显示了较好的腐蚀性能。因此,Ti-35Nb-7Zr-15HA复合材料可作为一种骨科植入手术中较好的替代材料。
In order to improve the biological activity of Ti-Nb-Zr alloy, the composite of Ti-35Nb-7Zr-xHA (hydroxyapatite, x = 5,10,15,20, mass fraction,%) was prepared by spark plasma sintering (SPS) material. The effects of HA content on the microstructure, mechanical properties and corrosion resistance of the composites were investigated by means of XRD, SEM, mechanical testing and electrochemical tests. The results show that the phases of all the composites consist mainly of β-Ti matrix, α-Ti and metal-ceramic phases (CaO, CaTiO_3, CaZrO_3, TixPy, etc.) A small amount of residual HA appeared. With the increase of HA content, the compressive strength of the composites were all higher than 1400MPa. The elastic modulus of composites (5% -15% HA) showed a small variation (46-52GPa) Closer to human bone elastic modulus. Electrochemical tests in Hank’s solution showed that the passivation current density and corrosion current density of the composites were lower at the HA content of 15%, indicating better corrosion performance. Therefore, Ti-35Nb-7Zr-15HA composite material can be used as a better substitute material in orthopedic surgery.