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,CaTiO3,CaZrO3,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1400 MPa,复合材料(5%?15%HA)的弹性模量呈较小变化趋势(46?52 GPa),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.
To improve the bioactivity of Ti-Nb-Zr alloy, Ti-35Nb-7Zr-xHA (hydroxyapatite, x=5, 10, 15 and 20, mass fraction, %) composites were fabricated by spark plasma sintering. The effects of the HA content on microstructure, mechanical and corrosion properties of the composites were investigated utilizing X-ray diffraction (XRD), scanning electron microscope (SEM), mechanical tests and electrochemical tests. Results show that all sintered composites are mainly composed of β-Ti matrix, α-Ti and metal-ceramic phases (CaO, CaTiO3, CaZrO3, TixPy, etc). Besides, some residual hydroxyapatites emerge in the composites (15%and 20% HA). The compressive strengths of the composites are over 1400 MPa and the elastic moduli of composites ((5%-15%) HA) present appropriate values (46-52 GPa) close to that of human bones. The composite with 15% HA exhibits low corrosion current density and passive current density in Hank's solution by electrochemical test, indicating good corrosion properties. Therefore, Ti-35Nb-7Zr-15HA composite might be an alternative material for orthopedic implant applications.
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