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A method for preparing high-performance powder metallurgy titanium and titanium alloy products by solid phase deoxidation

A powder metallurgy and high-performance technology, applied in the field of powder metallurgy titanium, can solve the problems of reducing sintering density, strength and elongation, expensive rare earth elements, and high cost of purifying agents, achieving excellent comprehensive mechanical properties, reducing adverse effects, Effect of improving sintering activity

Active Publication Date: 2021-04-27
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 by solid-phase deoxidation, which belongs to the field of powder metallurgy titanium. The present invention proposes to TiCl 2 As titanium powder oxygen scavenger, TiCl 2 Mix evenly with titanium powder, form and sinter to obtain high-performance titanium products. During sintering, TiCl 2 Oxidation-reduction reaction with titanium powder and oxide film on the surface to generate TiCl x o y The titanium matrix is ​​removed in a gaseous state without producing solid phase impurity particles, avoiding the introduction of the second phase to hinder sintering, and TiCl x o y It is beneficial to break the oxide film on the powder surface, thereby improving the sintering activity of titanium powder, promoting densification and sintering, so as to obtain low-oxygen and high-density titanium products, and has excellent comprehensive mechanical properties. The invention provides a new idea for deoxidizing powder metallurgy titanium and titanium alloys, and is conducive to promoting the industrialization development of low-cost powder metallurgy titanium and titanium alloys.

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 Patents(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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