Method for preparing high-performance powder metallurgy titanium and titanium alloy by recovering residual titanium

Abstract

A method for recovering and preparing high-performance powder metallurgy titanium and titanium alloys from residual titanium belongs to the field of powder metallurgy titanium. The invention uses the leftover materials, cutting materials, recycled processing materials or titanium chips of titanium and titanium alloys as raw materials. After cleaning and crushing, the hydrodehydrogenation process is used to obtain fine hydrogenated dehydrogenated titanium powder, and zirconium and hafnium powder are added as an oxygen-fixing agent. Zirconium hafnium powder and HDH titanium powder are mixed evenly, and then formed and sintered to obtain high-performance powder metallurgy titanium products. Zirconium, hafnium and titanium belong to the same group of elements with similar chemical properties, which hinder the sintering. During the sintering process, the three elements of Ti, Zr(Hf), and O form an ordered phase, which can reduce the oxygen content of the titanium matrix and strengthen it. Improve the plasticity of the titanium matrix and greatly increase the strength of the material, and then obtain high-performance powder metallurgy titanium and titanium alloy products. The preparation process of the present invention is simple, no additional equipment is required, and the recovery and utilization rate of residual titanium is high, which is of great significance to the low cost and green recycling of the titanium industry.

Description

technical field [0001] The invention belongs to the field of powder metallurgy titanium and provides a method for recovering residual titanium and preparing high-performance powder metallurgy titanium and titanium alloys. Background technique [0002] Titanium and titanium alloys have low density, high strength, good corrosion resistance and heat resistance, and good biocompatibility. They have been applied in aerospace, military marine, medical and chemical industries, and are gradually being used in energy, automobile and other industries. in the extension. However, titanium has a high affinity for interstitial elements and poor thermal processing performance, which makes the utilization rate of traditional cast and forged titanium alloy materials low (20%-50%), and produces a large amount of titanium chips, waste titanium, residual titanium scraps, etc., resulting in a large waste of titanium materials . Therefore, the recovery of residual titanium is also one of the im...

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Problems solved by technology

[0004] At present, there are mainly two ways to obtain high-performance powder metallurgy titanium products. One is to add active metals such as sodium, potassium, calcium, magnesium, etc. level down to hundreds of ppm, but the preparation process of this method is complicated, and the use of active metals has certain safety hazards, and it also increases the cost of powder making

Another method is to use rare earth elements as oxygen scavengers to improve the influence of high oxygen content on ductility. Rare earth elements have high affinity with oxygen and can form second phase particles to fix oxygen elements. However, rare earth elements are in the The solid solubility of titanium alloy is low, and generally there is no intermetallic compound, so the introduction of excessive rare earth elements will greatly reduce the density of the material, thereby affecting the mechanical properties, so the addition of rare earth elements generally does not exceed 1wt.%. The effect is limited, while rare earths are expensive and costly