Method for preparing high-performance powder metallurgy titanium and titanium alloy from superfine titanium powder

Abstract

The invention discloses a method for preparing high-performance powder metallurgy titanium and titanium alloy from superfine titanium powder, and belongs to the field of powder metallurgy titanium. Sponge titanium and sponge zirconium hafnium (oxygen fixing agent) are used as raw materials, are uniformly mixed, are subjected to hydrogenation, crushing and dehydrogenation processes to obtain superfine hydrogenated and dehydrogenated powder, and are formed and sintered to obtain a high-performance powder metallurgy titanium product. According to the method, the superfine powder is used for achieving sintering full compactness of the powder metallurgy titanium alloy, it is guaranteed that grains are small, in order to reduce the adverse effect of the high oxygen content in the superfine powder on a titanium matrix, zirconium and hafnium serve as the oxygen fixing agent, the zirconium and hafnium form a Ti-Zr (Hf)-O ordered phase with titanium and oxygen elements in the sintering process, the oxygen content in the titanium matrix is greatly reduced, and meanwhile the strengthening effect is achieved, so that the material mechanical property is improved. The preparation process is simple, the problem that the oxygen content of the superfine titanium powder is too high can be solved without additional equipment, the mechanical property of a final titanium product is guaranteed, and the method is suitable for large-scale industrial production and beneficial to promoting industrial development of powder metallurgy titanium.

Description

technical field [0001] The invention belongs to the field of powder metallurgy titanium and provides a method for preparing high-performance powder metallurgy titanium and titanium alloys from ultrafine titanium powder. Background technique [0002] Titanium and titanium alloys have low density, high strength, good corrosion resistance and heat resistance, and can maintain their mechanical properties at relatively high service temperatures. At the same time, they have excellent biocompatibility. It has been applied in chemical industry and other fields, and gradually expanded to energy, automobile and other industries. Titanium is rich in reserves on the earth, with a crustal abundance of 0.61%. Compared with metal copper, its total resources are nearly 61 times that of copper, but its output is only 1 / 80 of that of copper. This is because in the traditional smelting process, titanium is highly active and can react chemically with many elements and even refractory materials...

AI Technical Summary

Problems solved by technology

However, it has high requirements for equipment, high processing costs, low production efficiency, small production scale, and it is not easy to produce powder metallurgy titanium products with complex shapes.

[0004] The driving force of powder sintering mainly comes from the specific surface energy of the powder. Generally speaking, the smaller the particle size of the powder, the more irregular the shape, the larger the specific surface area, the higher the specific surface energy, and the better the sinterability, but the oxygen content The higher the value, the oxygen adsorbed on the surface cannot be removed in the subsequent process, which seriously affects the mechanical properties of the final product