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镁合金具有优异的生物相容性,但在生理环境中过快的腐蚀降解速率制约其成为可降解植入材料。此外,镁合金的力学性能也较低。通过添加纳米β-TCP颗粒来改善Mg-Zn-Zr合金的显微组织及性能,制备挤压态的Mg-3Zn-0.8Zr合金和Mg-3Zn-0.8Zr/xβ-TCP(x=0.5,1.0,1.5)复合材料。添加纳米β-TCP增强体的复合材料其晶粒明显细化。拉伸实验结果表明,添加β-TCP后,复合材料的极限拉伸强度和伸长率均有所提高。电化学测试结果表明,复合材料在模拟体液中的抗蚀性较合金基体显著提高,其中Mg-3Zn0.8-Zr/1.0β-TCP复合材料的腐蚀电极电位为1.547V,其腐蚀电流密度为1.20×106A/cm2.
Magnesium alloy has excellent biocompatibility, but in the physiological environment, excessive corrosion degradation rate restricts it to become degradable implant material. In addition, the mechanical properties of magnesium alloys are also low. The microstructure and properties of Mg-Zn-Zr alloy were improved by adding nano-β-TCP particles. The as-extruded Mg-3Zn-0.8Zr alloy and Mg-3Zn-0.8Zr / 1.0, 1.5) composites. The addition of nano-β-TCP reinforcements composite grain refinement significantly. Tensile test results show that, after adding β-TCP, the ultimate tensile strength and elongation of the composites are increased. The results of electrochemical tests showed that the corrosion resistance of the composite in the simulated body fluid was significantly higher than that of the alloy matrix. The corrosion potential of Mg-3Zn0.8-Zr / 1.0β-TCP composite was 1.547V and the corrosion current density was 1.20 × 106A / cm2.