Method for preparing high-performance powder metallurgy titanium and titanium alloy product through solid phase deoxygenization

A powder metallurgy and titanium alloy technology, applied in the field of powder metallurgy titanium, can solve the problems of reducing sintering density, strength and elongation, rare earth elements are expensive, and the oxygen removal effect is limited, so as to achieve excellent comprehensive mechanical properties and reduce adverse effects , the effect of reducing the preparation cost

Active Publication Date: 2020-05-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low solid solubility of rare earth elements in titanium alloys, intermetallic compounds generally do not exist, so when the content of rare earth elements is too high, the sintering density, strength and elongation will be greatly reduced, so the amount of rare earth elements added is generally less than 1wt .%, resulting in limited oxygen removal effect, and the price of rare earth elements is also relatively expensive, and the cost of purifying agent is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the mass percentage, it is composed of the following ingredients: 4wt.%TiCl 2 , the balance is hydrodehydrogenation pure titanium powder (HDH-Ti), wherein the particle size of HDH-Ti is D 50 =15 μm, the oxygen content is 3500 ppm. Concrete preparation steps are as follows:

[0021] (1) TiCl that meets the formula requirements 2 Mix with HDH-Ti under the protection of argon atmosphere in the glove box, and mix on a mixer for 15 hours to obtain a uniform mixed powder;

[0022] (2) Put the mixed powder into a cold isostatic silica gel bag in an argon-protected glove box and vibrate, vacuumize and seal it, and carry out cold isostatic pressing at a pressing pressure of 300 MPa, and hold the pressure for 2 minutes to obtain a compact sample;

[0023] (3) Put the compact sample into the sintering furnace for vacuum sintering, the vacuum degree is 10 -3 Pa, first heat preservation at 600°C for 60min, and then heat preservation at 1170°C for 1h, and finally ob...

Embodiment 2

[0025] According to the mass percentage, it is composed of the following ingredients: 3wt.%TiCl 2 , the balance is HDH-TC4 titanium alloy powder, wherein the particle size of HDH-TC4 is D 50 =30 μm, the oxygen content is 2500 ppm. Concrete preparation steps are as follows:

[0026] (1) TiCl that meets the formula requirements 2 Mix with HDH-TC4 under the protection of argon atmosphere in the glove box, and mix on the mixer for 10 hours to obtain a uniform mixed powder;

[0027] (2) Put the mixed powder into a cold isostatic pressing rubber sheath in an argon-protected glove box and vibrate, vacuumize and seal it, and carry out cold isostatic pressing at a pressing pressure of 400 MPa and hold the pressure for 1 min to obtain a green compact sample;

[0028] (3) Put the compacted sample into a sintering furnace for argon sintering, first hold it at 750°C for 90 minutes, then hold it at 1250°C for 1.5h, and finally obtain high-performance TC4 titanium alloy parts.

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Abstract

The invention discloses a method for preparing high-performance powder metallurgy titanium and titanium alloy through solid phase deoxygenization, and belongs to the field of powder metallurgy titanium. According to the method, TiCl2 serves as a titanium powder deoxidant and is uniformly mixed with titanium powder, and after forming and sintering, a high-performance titanium product is obtained. In the sintering process, TiCl2 conducts redox reaction with the titanium powder and an oxidation film on the surface, the Ti base of generated TiClxOy is removed in the gaseous state, no solid phase impurity particle is generated, and the situation that a second phase is introduced and hinder sintering is avoided; in addition, TiClxOy can break the oxidation film on the surface of the powder advantageously, accordingly, the sintering activity of the titanium powder is improved, densification sintering is promoted, accordingly, a low-oxygen high-density titanium product is obtained, and the excellent comprehensive mechanical properties are achieved. The method provides a new idea for deoxygenization of the powder metallurgy titanium and titanium alloy, low-cost powder metallurgy titanium and titanium alloy industrialization development is promoted advantageously.

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 through solid-phase deoxidation. Background technique [0002] Due to the poor processing performance of titanium and titanium alloys and the low material utilization rate, the processing cost is high, and the near-net shape technology has attracted extensive research interest and application focus. Powder metallurgy technology can directly prepare titanium alloy products in the final shape, avoiding the thermal processing and deep processing of titanium, and reducing the preparation and processing costs of titanium alloy products to the greatest extent. However, high oxygen content is one of the challenges currently faced by powder metallurgy titanium products, and the maximum critical content of oxygen in titanium products is 3200ppm. The oxygen in titanium products mainly comes from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/04B22F3/10C22C1/04C22C14/00
CPCB22F1/0003B22F3/04B22F3/1007B22F2998/00B22F2998/10C22C1/0458C22C14/00B22F2201/11B22F2201/20
Inventor 杨芳邵艳茹周洋郭志猛隋延力秦乾陈存广
Owner UNIV OF SCI & TECH BEIJING
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