论文部分内容阅读
利用放电等离子烧结技术制备了Ti-35Nb-7Zr-10CPP生物复合材料,研究了不同烧结温度(950~1150℃)对复合材料致密度、微观组织演变与力学性能的影响及机理。结果表明,复合材料主要由β-Ti相基体、少量残留α-Ti相及CaTiO_3、Ti_2O、CaO、CaZrO_3、Ti_xP_y等金属-陶瓷相组成;随着烧结温度升高,复合材料中残留α-Ti相逐渐减少,而金属-陶瓷相逐渐增多;复合材料的压缩弹性模量与抗压强度随烧结温度升高呈增大趋势,但是当烧结温度超过1050℃时,由于金属与陶瓷的剧烈反应导致金属-陶瓷相迅速增多,从而使得压缩弹性模量快速增大。因此,当烧结温度在1000~1050℃范围时,复合材料获得了较好的综合力学性能,其压缩弹性模量为42~45 GPa、抗压强度为1240~1330MPa;同时,在模拟人工体液中浸泡7 d后,复合材料表面能够获得一层致密的类骨磷灰石层,显示了良好的生物活性。
Ti-35Nb-7Zr-10CPP composites were prepared by spark plasma sintering. The effects of different sintering temperature (950 ~ 1150 ℃) on the densification, microstructure evolution and mechanical properties of composites were investigated. The results show that the composites mainly consist of β-Ti phase matrix, a small amount of residual α-Ti phase and CaTiO_3, Ti_2O, CaO, CaZrO_3 and Ti_xP_y. With the increase of sintering temperature, Phase and the metal-ceramic phase increased gradually. The compressive elastic modulus and compressive strength of the composites tended to increase with the sintering temperature. However, when the sintering temperature exceeds 1050 ℃, the metal- The ceramic phase increases rapidly, resulting in a rapid increase in compressive elastic modulus. Therefore, when the sintering temperature is in the range of 1000 ~ 1050 ℃, the composites have good mechanical properties, the compressive elastic modulus is 42-45 GPa and the compressive strength is 1240 ~ 1330MPa. Meanwhile, in the simulated artificial body fluid After soaking for 7 days, a dense layer of bone-like apatite could be obtained on the surface of composites, showing good bioactivity.