The technical field of porous titanium-niobium alloy and its preparation method, relates to the preparation technology of titanium-niobium alloy. Background Technology Porous metal materials have been widely used in some fields because of their advantages of low density, low modulus and high strength/density ratio. Titanium and its alloys as human bone replacement materials have been relatively mature applications in biology, but titanium and its alloys have high density, high modulus deficiency, and some titanium alloys (such as Ti-Ni alloy) contain harmful elements to human body, therefore, it is necessary to develop low density, low modulus, non-toxic titanium alloys. Porous Ti-Nb alloy is a non-toxic alloy with low density and low modulus that can be used as a bone replacement material for human body. At present, there are various methods to prepare porous metal alloys, and powder metallurgy is one of them. This method is suitable for preparing components with high porosity, uniform pore distribution, complex structure and stable composition. Therefore, this kind of porous titanium-niobium alloy is suitable to be prepared by powder metallurgy. The invention aims to provide a process for preparing porous titanium-niobium alloy by powder metallurgy.
The invention relates to a porous titanium niobium alloy and a preparation method thereof. The porous titanium-niobium alloy of the invention is niobium 35% by weight percentage, and the remainder is Ti. The preparation process of porous titanium-niobium alloy is as follows :(1) the purity of Ti and Nb is 99.9%, the particle size of Ti and Nb is 45 mesh and 325 mesh respectively, and the particle size of spherical urea is 200-500 μ m as foaming agent. (2) According to the mass percentage, 65% Ti powder and 35%Nb powder are weighed; (3) The weighing raw material powder is loaded into the ball mill tank, filled with argon gas for protection, and then mixed evenly in the ball mill. The ball grinding time is 40 minutes, the rotational speed is llOr/min, and the ball-material ratio is 10:1; (4) After the powder is mixed, when the temperature of the ball mill tank is close to room temperature, take out the powder and put it into a container, add the urea with the weight of 259 γ 62.5% of Ti and Nb powder, mix well; (5) Pour the mixed powder in step (4) into the mold and press it for 5 minutes under the pressure of 200MPa with a press;
The beneficial effects are as follows: the foaming agent urin used in porous titanium-niobium alloy prepared by the powder metallurgy method of the invention can be volatilized at a relatively low temperature and easily removed, and the shape, size, porosity and uniformity of pore distribution can be controlled within a certain range by adjusting the shape, size and amount of urea. For titanium-niobium alloy with high sintering temperature and easy oxidation, the porous titanium-niobium alloy with good sintering quality can be obtained by high vacuum sintering under the condition that the holes are formed in advance (the blank has no support body). Specific implementation method: the porous titanium-niobium alloy of the present invention is composed of Nb35% and Ti in percentage by weight.
