Preparation method of high-purity titanium powder

Abstract

The invention provides a preparation method of high-purity titanium powder. The method includes the steps: selecting high-purity molten salt electrolysis titanium as raw materials, obtaining ultra-fine grain titanium materials by a high-pressure torsion method, and enabling the titanium raw materials to absorb heat to generate hydrogen absorption reaction, tender and easily crush to a certain particle size by a hydrogenation-dehydrogenation and mechanical ball milling method under a special process control condition; performing dehydrogenation for the titanium raw materials; finally, further crushing the titanium raw materials to obtain ultra-fine high-purity titanium powder. The used raw materials are not sponge titanium obtained by a traditional magnesium heating method, the process is more environmentally friendly, the molten salt electrolysis titanium is high in purity and low in oxygen content, the ultra-fine grain titanium materials treated by severe plastic deformation of high-pressure torsion has high dislocation density and inner stress and a wide-angle non-equilibrium grain boundary, the hydrogenation temperature of the treated ultra-fine grain titanium materials is obviously reduced as compared with untreated titanium materials, raw material oxidation caused by over-high temperature can be effectively reduced, the particle sizes of the prepared titanium powder are small and uniform, and various production requirements are met.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, specifically relates to a composite technology for preparing titanium powder by high-pressure torsion processing and hydrogenation dehydrogenation, and provides a novel preparation method of ultrafine high-purity titanium powder. Background technique [0002] Pure titanium generally refers to titanium materials with a purity (mass fraction) greater than 99%, among which the purity of high-purity titanium can reach 4N grade (99.99%) or even higher. As a member of titanium series products, high-purity titanium not only has low density, high melting point, and strong corrosion resistance, but also has low strength and good plasticity (the elongation rate can reach 50% to 60%, and the shrinkage rate can reach up to 70% to 80%) and other characteristics. In recent years, with the rapid development of high-tech industries such as aerospace and electronic information, the amount of high-puri...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of particle size refinement and oxygen content reduction in the preparation process of high-purity titanium powder, and provide a high-quality high-purity titanium powder for powder metallurgy near-net molding parts, corrosion-resistant components and friction materials, etc. The preparation method of this method has low energy consumption, reduces pollution, improves production efficiency, and reduces production costs