Titanium tantalum alloy and its preparation method and application, belonging to the technical field of powder metallurgy preparation. Titanium tantalum alloy of the invention, in atomic percentage includes: Ti 50-80%, Ta 20-50%; The Ti Ta alloy porosity is 2.0‑15.5％; The Ti Ta alloy contains tantalum rich area and titanium rich area, tantalum rich area and titanium rich area alternating distribution, adjacent tantalum rich area and titanium rich area between the transition zone; The rich Ta area in atomic percentage includes: Ta 70-80%, Ti 30-20%; The rich Ti area in atomic percentage includes: Ti 70-80%, Ta 30-20%. Titanium alloy with moderate elastic modulus and high strength is obtained by powder metallurgy using titanium powder with particle size of 45 ~ 150μm and tantalum powder with particle size of 1 ~ 10μm as raw materials. The invention has the advantages of simple preparation, low cost and low energy consumption, and is suitable for mass production.
A preparation method for Ti-Nb-Ta-Zr near β type medical titanium alloy. Titanium alloy prepared by this method has grain size in 20-30μm, no porosity, low elastic modulus (42-65GPa), and improved tensile strength (590-97 IMPa). However, due to the excessive variety of added elements, composition control is difficult. In order to ensure the homogenization of refractory tantalum element, It is necessary to choose niobium-tantalum intermediate alloy to provide tantalum element, and then it needs to undergo a series of complex processing procedures such as multiple melting, heat treatment, milk making and heat treatment, which is difficult and costly.
The invention relates to a preparation method of biological porous titanium. The porous titanium alloy was obtained by powder metallurgy process by adding pore-forming agent. The porosity of the product was 60-70%, the elastic modulus was greater than 0.3gpa, but the tensile strength was only about 40MPa, which could not meet the requirements of material strength in practical application.
It is very important to prepare a titanium alloy with low elastic modulus, high strength, good biocompatibility and low cost to achieve large-scale production and application.
