【作者】 陈艳飞；

【导师】 陈玉勇；

【作者基本信息】 哈尔滨工业大学 ， 材料加工工程， 2006， 硕士

【摘要】 生物医用钛合金以其与骨骼相近似的弹性模量、良好的生物相容性和机械加工性能及在生物环境下优良的抗腐蚀性等优点,引起了国内外学者的广泛关注,并在临床上得到了越来越广泛的应用。本文根据生物医用钛合金开发的现状和存在的问题,从合金选择、熔炼工艺出发,选择出新型生物医用Ti-Mo合金和Ti-Mo-Nb合金,并对其显微组织和力学性能进行研究。具体研究内容和结果如下:根据钛合金的分类及其特点,结合合金的选用原则,参照d电子合金理论,选定了合金化元素为Mo元素和Nb元素作为强化元素。这两种元素在强化的同时,对合金的塑性影响较小,同时具有优异的耐腐蚀性能和良好的生物相容性。结合Mo和Nb这两种元素对合金强度的影响,选用了一种Ti-Mo合金,并在二元合金的基础上加入Nb元素,制备出Ti-Mo-Nb合金。利用光学显微镜(OM)、X射线衍射(XRD)、透射电镜(TEM)等方法,系统地研究了Mo元素对Ti-Mo合金显微组织结构的影响,并对Ti-Mo合金的抗压强度、弹性模量、维氏硬度等几种常规力学性能进行了研究。考察了合金元素Mo对Ti-Mo合金力学行为的影响,并分析了Ti-Mo合金的断裂行为。结果表明,当Mo含量为10wt%时,Ti-Mo合金的等轴晶粒明显细化,抗干磨能力最好,具有优良的综合力学性能。在Ti-10Mo合金的基础上加入Nb元素,研究了Nb元素对Ti-10Mo合金的显微组织和力学性能的影响,得知Ti-10Mo-10Nb合金由β相组成,其屈服强度与Ti-10Mo合金相当,而塑性却大大改善。综合分析比较后,最终制备出一种新型生物医用钛合金。作为一种新型生物医用钛合金,Ti-10Mo-10Nb合金符合设计原则中提出的要求,具有良好的显微组织和力学性能,具有良好的应用前景。更多还原

【Abstract】 Due to their similar elastic modulus to bone, excellent biocompatibility and mechanical properties and corrosion resistance in biological environment, titanium alloys have been widely studied and widely used in clinics. According to exploitation status quo and existing flaws of titanium alloys for surgical implants, considering the design principles and melting technology, new titanium alloys Ti-Mo and Ti-Mo-Nb for surgical implants is designed and studied, and also their mechanical properties and microstructures are systematically studied in this thesis. The concrete contents and results are shown as the follows:According to characteristics of each kind of titanium alloy , the design principles and d theory of the alloy, Mo and Nb are selected as intensification elements, which possess excellent corrosion resistance and outstanding biocompatibility, at the same time, have few effects on plastic deformation during strengthening the matrix. Based on the effect of Mo and Nb on strength of the titanium alloy, and then the titanium alloys are confirmed as Ti-Mo alloys, and then a new kind of biomedical titanium alloys was prepared when element Nb was added to the Ti-Mo alloys.The effect of Mo on the microstructure and mechanical properties of Ti-Mo alloys have been systematically studied by means of Optical Microscope(OM), X-ray Diffraction(XRD), Transmission Electron Microscope (TEM).The mechanics behaviors for compression strength, the elastic modulus and Vickers hardness were studied, too. At the same time, the influence of Mo on Ti-Mo alloys’mechanics behavior and the fracture behavior were analysed.The results indicate that the size of Ti-Mo alloys’equi-axed grains was dramasticly decreased and needle exudation matters in crystal interior distributed unorderly were found and the alloy has excellent complex mechanics behavior when the content of Mo is 10 wt %. When Nb was added to Ti-10Mo alloy ,the influence of Nb on it related to microstructure and properties was studied, and the microstructure of Ti-10Mo-10Nb alloy is made up of equi-axed and dendriticβgrains, its yield strength is similar with that of Ti-10Mo alloy and plastic properties were improved greatly. A new biomedical alloy was prepared finally更多还原