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- 2019
Zn-β-磷酸钙/Ti生物复合材料组织及性能
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Abstract:
采用化学沉淀法制备掺杂Zn的β-磷酸钙（β-TCP）粉末，Zn-β-TCP与Ti粉以3∶7（质量比）混合均匀经真空烧结得到Zn-β-TCP/Ti生物复合材料。结合金相观察、SEM、XRD等进行微观组织和表面形貌观察、物相分析，并进行显微硬度、摩粒磨损、单轴压缩和体外生物活性测试。结果表明：Zn-β-TCP粉体中粒径（D50）集中在1~20 μm。β-TCP/Ti生物复合材料成分为TiO2、Ti、β-TCP和CaTiO3，Zn-β-TCP/Ti复合材料成分为TiO2、Ti、β-TCP、CaTiO3和ZnO，Zn2+固溶到β-TCP晶格使衍射峰偏移，掺杂10mol% Zn的偏移角度最大。β-TCP结晶度随Zn掺杂量的增大而降低。β-TCP/Ti复合材料的TiO2相弥散分布在网状β-TCP相中，Zn摩尔分数为10mol%时，Zn-β-TCP/Ti复合材料的孔隙孔径在200~300 μm，满足工程支架材料的要求，且硬度最高为HV 346.2，磨损率最低为0.051 mgmm-2，抗压强度在130~180 MPa之间，弹性模量最大为8.021 GPa，Zn的加入提高了β-TCP/Ti复合材料的力学性能。类骨磷灰石的积累随在模拟体液中浸泡时间的延长而增多，Zn-β-TCP/Ti生物复合材料具有良好的生物活性。 Zn doped β-tricalcium phosphate (β-TCP) powder was prepared by the chemical coprecipitation, mixed with Ti powder at 3:7 (mass ratio) and pressed evenly, and Zn doped β-TCP/Ti composite samples were obtained by vacuum sintering. The microstructure, surface morphology and phase analysis were carried out by metallographic observation, SEM and XRD, and microhardness, abrasive wear, uniaxial compression and in vitro bioactivity tests were carried out. The results show that the particle size (D50) in Zn-β-TCP powder is focus on 1-20 μm. The component of Zn-β-TCP/Ti composite are TiO2, β-TCP and CaTiO3. The phases of Zn-β-TCP/Ti composites consist of TiO2, β-TCP, CaTiO3 and ZnO. When Zn2+ is dissolved into β-TCP lattice, the diffraction peak is shifted, and the Zn-β-TCP/Ti biocomposite with 10mol% Zn has the largest migration angle. The crystallinity of β-TCP decreases with the increase of Zn. The TiO2 phase of the β-TCP/Ti composite is dispersed in the net β-TCP phase. The pore size of the Zn-β-TCP/Ti composite with 10mol% Zn is 200-300 μm, which meets the requirements of engineering scaffold materials, with the highest microhardness of HV 346.2, the lowest wear loss of 0.051 mgmm-2, the compressive strength between 130-180 MPa, and the maximum elastic modulus of 8.021 GPa. The addition of Zn improves the microhardness and wear resistance of the Zn-β-TCP/Ti composites. The accumulation of carbonate hydroxyapatite increases with the soaking in simulated body fluid, and the Zn-β-TCP/Ti biocomposites have good bioactivity
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