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

A powder metallurgy, high-performance technology, applied in the field of powder metallurgy titanium, can solve the problems of limited oxygen removal effect, reduce material density, increase powder production cost, etc., achieve low-cost green and recyclable production, improve recycling rate, The effect of improving material utilization

Active Publication Date: 2022-03-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for recovering residual titanium to prepare high-performance powder metallurgy titanium and titanium alloys, using pure titanium cutting materials as raw materials, the specific preparation steps are as follows:

[0025] (1) Ultrasonic cleaning is performed on the cutting material for 13 hours, and the cleaning agent is dichloromethane, and then the cutting material is shredded by a metal shredder, and a second ultrasonic cleaning is performed to obtain pure titanium chips;

[0026] (2) hydrogenation of titanium chips by hydrogenation process, followed by crushing and dehydrogenation treatment, to obtain hydrogenated dehydrogenated titanium powder with a particle size of 20 μm;

[0027] (3) Weigh the hydrogenated dehydrogenated titanium powder and the pure zirconium powder with a particle size of 10 μm according to the mass ratio of 98.5:1.5 in an argon-protected glove box, put them into a mixing tank, and then mix them on a mixer for 8 hours , to obtain a unif...

Embodiment 2

[0031] A method for recovering and preparing high-performance powder metallurgy titanium and titanium alloys from residual titanium, using Ti6Al4V titanium alloy scraps as raw materials, the specific preparation steps are as follows:

[0032] (1) Ultrasonic cleaning of Ti6Al4V titanium alloy shavings for 20 hours, the cleaning agent is chloroform, and then the residual titanium material is shredded by a metal shredder, and a second ultrasonic cleaning is performed to obtain Ti6Al4V titanium alloy shavings;

[0033] (2) Hydrogenate Ti6Al4V titanium alloy chips by hydrogenation process, then crush and dehydrogenate to obtain hydrogenated dehydrogenated Ti6Al4V powder with a particle size of 10 μm;

[0034] (3) Weigh the hydrodehydrogenated Ti6Al4V powder and 3 μm pure zirconium powder in an argon-protected glove box according to the mass ratio of 95:5, put them into a mixing tank, and then mix them on a mixer for 12 hours to obtain a uniform mixed powder;

[0035] (4) Put the m...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/04B22F9/02B22F3/04B22F3/10
CPCC22C14/00C22C1/0458B22F9/023B22F3/04B22F3/1007B22F2009/001
Inventor 杨芳周洋郭志猛陈存广隋延力芦博昕秦乾邵艳茹
Owner UNIV OF SCI & TECH BEIJING
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