稀土对HA/Ti复合材料力学及生物活性影响的研究

Study on effect of rare earths on the mechanical and biological activity of HA/Ti composites

为进一步改善HA/Ti复合材料的性能,以HA粉及商用Ti粉为原料,分别加入一定量的不同稀土化合物(CeO_(2)、LaF_(3)及SrO),利用粉末冶金方法制备了稀土增强型HA/Ti生物复合材料。借助X射线衍射仪(XRD)、扫描电镜(SEM)、金相显微镜及万能力学试验机,探究了三种稀土元素对HA/Ti复合材料组织结构、力学性能及生物活性的影响。结果表明,分别添加0.3%的CeO_(2)、LaF_(3)及SrO稀土化合物所得的三种复合材料的力学性能均得以改善,其抗压强度分别为47、91 MPa和40 MPa,而未添加稀土的HA/Ti复合材料的抗压强度仅为34 MPa;且LaF_(3)还能进一步改善复合材料的生物活性,但添加CeO_(2)和SrO未能改善其生物活性。

In order to further improve the properties of HA/Ti composite materials,using HA powder and commercial Ti powder as raw materials,adding a certain amount of different rare earth complexes(CeO_(2),LaF_(3) and SrO),a rare earth reinforced HA/Ti biological composite material was prepared by powder metallurgy method.The effects of three rare earth elements on the microstructure,mechanical properties,and biological activity of HA/Ti composites were investigated using X-ray diffraction(XRD),scanning electron microscopy(SEM),metallographic microscopy and universal mechanical testing machines.The results show that the mechanical properties of the three composites obtained by adding 0.3%CeO_(2),LaF_(3),and SrO rare earth compounds are improved,with compressive strengths of 47,91 MPa,and 40 MPa,respectively,while the compressive strength of the HA/Ti composite without adding rare earth compounds is only 34 MPa.Moreover,LaF_(3) can further improve the biological activity of the composite material,but adding CeO_(2) and SrO cannot improve its biological activity.