Ti-35Nb-7Zr-XCPP生物复合材料的放电等离子烧结制备及其力学性能研究

Mechanical Properties of Ti-35Nb-7Zr-XCPP Biomedical Composites Prepared by Spark Plasma Sintering

摘要:

采用放电等离子烧结技术制备了Ti-35Nb-7Zr-XCPP生物复合材料，研究了焦磷酸钙（CPP）含量对复合材料致密度、微观结构、显微组织及其力学性能（压缩强度、压缩弹性模量）的影响。结果表明：复合材料组织主要由β-Ti相基体、少量残留α-Ti相及CPP相组成，CPP含量的增加会导致复合材料中残留α-Ti相含量增加，过高的CPP加入量会使得CPP发生分解现象；复合材料具有较低的压缩弹性模量（40~62 GPa）和较高的抗压强度（1000 MPa以上），显示了良好的力学相容性，过高的CPP加入量会导致复合材料压缩弹性模量出现明显增大现象，从而对复合材料力学相容性产生不利的影响

Abstract:

Ti-35Nb-7Zr-XCPP biomedical composites were prepared by a spark plasma sintering (SPS) technique. The effects of the contents of the calcium pyrophosphate (CPP) on the relative density, microstructure and mechanical properties of the composites were investigated. The results show that the composites are consisted of β-Ti phase matrix, a little residual α-Ti phase and CPP phase. The α-Ti phase of the composites increases with the increasing of the content of the CPP. Furthermore, CPP would decompose due to its excessive content in the composites. The composites present a lower compressive elastic modulus in the range of 40~62 GPa and a higher compressive strength level more than 1000 MPa, and it exhibits a better mechanical compatibility. However, the compressive elastic modulus of the composites significantly increases when the CPP is excessive, and then it would do harm to the mechanical compatibility of the composites