CAJ | 학술논문

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fl-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-1.547 V,其腐蚀电流密度为1.20×10-6A/cm2.
미합금구유우이적생물상용성,단재생리배경중과쾌적부식강해속솔제약기성위가강해식입재료.차외,미합금적역학성능야교저.통과첨가납미β-TCP과립래개선Mg-Zn-Zr합금적현미조직급성능,제비제압태적Mg-3Zn-0.8Zr합금화Mg-3Zn-0.8Zr/xβ-TCP(x=0.5,1.0,1.5)복합재료.첨가납β-TCP증강체적복합재료기정립명현세화.랍신실험결과표명,첨가fl-TCP후,복합재료적겁한랍신강도화신장솔균유소제고.전화학측시결과표명,복합재료재모의체액중적항식성교합금기체현저제고,기중Mg-3Zn0.8-Zr/1.0β-TCP복합재료적부식전겁전위위-1.547 V,기부식전류밀도위1.20×10-6A/cm2.
Magnesium alloys have good biocompatibility, but their mechanical properties and corrosion resistance may not be satisfied for using as degradable materials within bone due to its high corrosion rate in the physiological environment. Nano β-TCP particles were added into Mg-Zn-Zr alloy to improve its mierostructure and the properties. As-extruded Mg-3Zn-0.8Zr alloy and Mg-3Zn-O.8Zr/xβ-TCP (x=0.5%, 1.0% and 1.5%) composites were respectively fabricated. The grains of Mg-Zn-Zr/β-TCP composites were significantly refined. The results of the tensile tests indicate that the ultimate tensile strength and the elongation of composites were improved with the addition of β-TCP. The electrochemical test result in simulation body fluid shows that the corrosion resistance of the composites was strongly enhanced comparing with that of the alloy. The corrosion potential of Mg-3Zn0.8-Zr/1.0β-TCP composite is -1.547 V and its corrosion current density is 1.20×10-6 A/cm2.