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为改善β型Ti-Nb-Zr合金的生物活性,添加20wt%的焦磷酸钙(CPP)生物陶瓷,利用放电等离子烧结技术制备20CPP/Ti-35Nb-7Zr生物复合材料。借助XRD、SEM及力学测试方法等研究不同烧结温度(1 000~1 200℃)下复合材料的微观组织及力学性能,揭示其组织演变对力学性能的影响机制。结果表明:20CPP/Ti-35Nb-7Zr复合材料主要由β-Ti相基体、少量残留α-Ti相及金属-陶瓷相(CaTiO_3、Ti_2O、CaO、CaZrO_3和TixPy)组成;随着烧结温度升高,复合材料中β-Ti相和金属-陶瓷相逐渐增多;金属与陶瓷之间的剧烈反应导致金属-陶瓷相的形态结构发生变化,复合材料中金属-陶瓷相从颗粒状析出物演变成连续网状组织,起到割裂基体的作用。20CPP/Ti-35Nb-7Zr复合材料的压缩弹性模量和抗压强度随着烧结温度的升高而增大,其中压缩弹性模量从64.0GPa增加至71.4GPa,金属-陶瓷相形态结构变化起主导作用。因此,控制20CPP/Ti-Nb-Zr复合材料中金属-陶瓷相的形态结构将有利于改善其力学性能。
In order to improve the biological activity of β-Ti-Nb-Zr alloy, 20wt% calcium pyrophosphate (CPP) bioceramic was added and 20CPP / Ti-35Nb-7Zr composites were prepared by spark plasma sintering. The microstructure and mechanical properties of the composites at different sintering temperature (1000 ~ 1 200 ℃) were studied by XRD, SEM and mechanical testing methods to reveal the mechanism of the microstructure and mechanical properties of the composites. The results show that the 20CPP / Ti-35Nb-7Zr composites consist mainly of β-Ti phase matrix, a small amount of residual α-Ti phase and metal-ceramic phases (CaTiO_3, Ti_2O, CaO, CaZrO_3 and TixPy) , The content of β-Ti phase and the metal-ceramic phase in the composites increased gradually. The violent reaction between the metal and the ceramic led to the change of the morphology of the metal-ceramic phase. The metal-ceramic phase in the composites evolved from the granular precipitates into continuous Reticular tissue, play the role of splitting the matrix. The compressive elastic modulus and compressive strength of 20CPP / Ti-35Nb-7Zr composites increase with the increase of sintering temperature, and the compressive elastic modulus increases from 64.0GPa to 71.4GPa. The morphologies of the metal-ceramic phases change from Leading role. Therefore, controlling the morphology of the metal-ceramic phase in 20CPP / Ti-Nb-Zr composites will be beneficial to improve its mechanical properties.