微波烧结工艺对Ti-Mg复合材料组织和性能的影响

Effect of microwave sintering process on microstructure and properties of Ti-Mg composites

为了确定制备Ti-Mg复合材料的最佳微波烧结工艺,采用微波烧结制备了Ti-15Mg复合材料。采用扫描电镜、差热分析、X射线衍射、光学显微镜、压缩试验以及耐腐蚀性测试等系统性地研究了烧结温度、保温时间对复合材料微观组织、力学性能和耐腐蚀性能的影响。结果表明,烧结温度为540~600℃,随着烧结温度的升高,复合材料的致密化程度提高,孔隙率降低,抗压强度增强,耐腐蚀性增强;烧结温度为600℃时,镁均匀地分布在钛基体中,复合材料的性能最佳,满足作为医用材料的性能要求;烧结温度继续升高则会导致复合材料中镁的大量挥发,孔隙率增加,复合材料的强度下降。微波烧结制备Ti-15Mg复合材料具有快速、稳定烧结的特点,因此保温时间对复合材料性能的影响不明显。

In order to determine the optimal microwave sintering process for preparing Ti-Mg composites,Ti-15Mg composites were prepared by microwave sintering.The effects of sintering temperature and holding time on microstructure,mechanical properties and corrosion resistance of the composites were systematically studied by means of scanning electron microscope,differential thermal analysis,X-ray diffraction,optical microscope,compression test and corrosion resistance test.The results show that when the sintering temperature is 540-600℃,with the increase of sintering temperature,the densification degree of the composites increases,the porosity decreases,the compressive strength and corrosion resistance increase.When the sintering temperature is 600℃,magnesium is uniformly distributed in the titanium matrix,and the performance of the composites is the best,meeting the performance requirements of medical materials.The continuous increase of sintering temperature leads to a large amount of volatilization of magnesium in the composites.The porosity increases and the strength of the composites decreases.Ti-15Mg composites prepared by microwave sintering have the characteristics of fast and stable sintering,so the effect of holding time on properties of composites is not obvious.