原料粒径与烧结温度对放电等离子烧结Ti-29Nb-13Ta-4.6Zr合金组织和性能的影响

摘要

Ti-29Nb-13Ta-4.6Zr biomedical alloy was prepared by Spark Plasma Sintering (SPS) technology. The effects of raw powder size and sintering temperature on microstructure and mechanical properties of the alloys were investigated. The results show that, the alloys are consisted mainly of theβ-Ti phase matrix, the some unmelted Nb, Ta metal particles, and a littleα-Ti phase. With increasing sintering temperature, the content of unmelted Nb, Ta particles andα-Ti phase in the alloys decrease. With decreasing raw powder size, the β-Ti phase is more evenly distributed and the content of unmelted metal particles decrease significantly in the alloys at the same sintering temperature. As a result, the compressive elastic modulus of the alloys reduce. In the meantime, the compressive strength and the relative density of the alloys are improved. When the raw powder size of Nb, Ta and Zr is 10.5μm and the sintering temperature is 1 200℃, the best mechanical properties of the alloys are obtained with the compressive elastic modulus of 46 GPa and the compressive strength of 1 550 MPa.%利用放电等离子烧结技术(SPS)制备生物医用Ti-29Nb-13Ta-4.6Zr合金，研究原料粒径与烧结温度对合金显微组织和力学性能的综合影响。结果表明：烧结合金组织由β-Ti 相基体及少量未熔化金属颗粒和残留α-Ti 相组成，烧结温度的升高会减少未熔化金属颗粒和残留α-Ti相；在相同烧结温度下，Nb、Ta、Zr金属颗粒粒径的减小，会促使烧结合金中的β-Ti相组织更为均匀并使未熔化金属颗粒明显减少，从而降低合金的压缩弹性模量和提高合金的抗压强度与致密度；在Nb、Ta、Zr金属颗粒粒径为10.5µm和烧结温度为1200℃时，合金获得了压缩弹性模量为46 GPa、抗压强度为1550 MPa的最佳综合力学性能。