The invention relates to a method for preparing titanium, niobium, tantalum and zirconium biomedical titanium alloy by spark plasma sintering, belonging to the technical field of biomedical material preparation. The metal powders of Ti, Nb, Ta and Zr were weighed according to the ratio of chemical composition, mixed by ball mill and put into graphite mold, then placed into discharge plasma sintering furnace, applied axial pressure of 10 ~ 40MPa, and sintered under vacuum condition of 2 ~ 6Pa. The heating rate was 50 ~ 100 ℃ /min, and the sintering temperature was 950 ~ 1100 ℃. After reaching the sintering temperature, it was kept for 5 ~ 10min, and then cooled to room temperature with the furnace. The titanium, niobium, zirconium and tin biomedical titanium alloy prepared by the method has the advantages of uniform composition and structure, high density (more than 98%), low elastic modulus (41 ~ 50GPa) and other advantages. At the same time, the method has the advantages of simple process, convenient operation, low cost and easy to realize industrial production.
In order to achieve long-term and non-rejection implantation and replacement in the human body, the research of biomedical titanium alloy materials has undergone continuous development and improvement, from the traditional pure titanium, Ti-Al-V alloy (Ti-6Al-4V), Ti-Al-Nb alloy (Ti-6Al-7Nb) to the current new β type medical titanium alloy. At present, researchers at home and abroad mainly obtain β -type medical titanium alloys by adding β -stabilizing and strengthening elements such as niobium (Nb), tantalum (Ta) and zirconium (Zr) into pure titanium (Ti). The addition of the above elements can not only significantly reduce the elastic modulus of the material, but also improve the strength and wear resistance of the alloy. Moreover, because the added elements are non-toxic and do not produce allergic reactions in the implanted body, they have good biocompatibility and become one of the most promising new biomedical titanium alloy materials for human body replacement and repair. For the film's work, Geetha, Sum. K. Singh, R. Asokamani, Sum. K. Gogia. The ultimate choice of orthopaedic implants - A review. Journal of Materials Science, 2009, Vol. 54, pp 397-425. Zirconium, titanium niobium tantalum department of biomedical titanium alloys lowest elastic modulus value can reach 55 GPa, already very close to the elastic modulus of human natural bone, at the same time, alloy containing Ti, Nb, Ta, Zr four elements non-toxic and has good biocompatibility, comprehensive performance is superior to use in clinic at present most Ti-6Al-4V medical titanium alloy.
