Preparation method of diffusion bonding titanium powders

A titanium powder and bonding technology, which is applied in the field of diffusion bonding titanium powder preparation, can solve the problems affecting the mechanical properties of titanium products, the control of the oxygen content of the original powder, and the high cost of pre-alloyed powder, so as to achieve small investment in fixed assets and uniform composition. , High production efficiency

Active Publication Date: 2021-03-09
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because PA powder generally has high hardness, the compression performance is poor, and the cost of pre-alloyed powder is much higher than that of mixed element powder
However, it is difficult to effectively control the oxygen content in the original powder by using mixed element powder, which seriously affects the mechanical properties of titanium products.

Method used

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  • Preparation method of diffusion bonding titanium powders
  • Preparation method of diffusion bonding titanium powders

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Mix titanium sponge particles with a particle size of 200 microns, Al powder with a particle size of 40 microns, and V powder with a particle size of 30 microns according to the composition of the Ti-6Al-4V alloy, and put a certain amount of grinding balls into the V-shaped mixture Machine for 1 hour mixing.

[0046] 2. After the titanium alloy powder has been mixed, put it into a hydrogen furnace after standing for 0.5 hours, and in an inert atmosphere, heat up to 650 degrees Celsius, keep the inert atmosphere and keep it warm for 5 hours.

[0047] 3. Stop heat preservation, cool down with the furnace, and feed hydrogen, keep feeding hydrogen until it cools to room temperature.

[0048] 4. Turn off the hydrogen, turn on the hydrogen furnace, take out the Ti-6Al-4V alloy powder for cooling and absorbing hydrogen, put it in the ball mill pot together with the grinding balls, and carry out ball mill crushing in an argon or nitrogen atmosphere. After ball milling, Ti-6A...

Embodiment 2

[0055] 1. Proportionate titanium sponge particles with a particle size of 500 microns, Al powder with a particle size of 10 microns, and Fe powder with a particle size of 5 microns according to the composition of the Ti-5Al-2.5Fe alloy, and put a certain amount of grinding balls into the V-shaped mixing The mixer was mixed for 1 hour.

[0056] 2. Put the mixed Ti-5Al-2.5Fe alloy powder into a hydrogen furnace after standing still for 0.5 hour, in an inert atmosphere, heat up to 650 degrees Celsius, keep the inert atmosphere and keep it warm for 5 hours.

[0057] 3. Stop heat preservation, cool down with the furnace, and feed hydrogen, keep feeding hydrogen until it cools to room temperature.

[0058] 4. Turn off the hydrogen, turn on the hydrogen furnace, take out the cooled hydrogen-absorbing titanium alloy powder, place it in the ball mill jar together with the grinding balls, and carry out ball milling and crushing in an argon or nitrogen atmosphere. After ball milling, the...

Embodiment 3

[0065] 1. Mix titanium sponge particles with a particle size of 200 microns and Al-V alloy powder with a particle size of 30 microns according to the Ti-6Al-4V alloy composition, and put a certain amount of grinding balls into a V-shaped mixer for 1 hour mixing , and then add 1.5vol% polyethylene glycol binder and mix well.

[0066] 2. Put the mixed Ti-6Al-4V alloy powder into a hydrogen furnace after standing still for 0.5 hours, raise the temperature to 200 degrees Celsius in an inert atmosphere, keep the inert atmosphere and keep it warm for 8 hours. Continue to heat up to 650 degrees Celsius, keep an inert atmosphere and keep warm for 5 hours.

[0067] 3. Stop the heat preservation, cool down with the furnace, and feed hydrogen (hydrogen pressure 1 bar), keep feeding hydrogen until it cools to room temperature.

[0068] 4. Turn off the hydrogen, turn on the hydrogen furnace, take out the Ti-6Al-4V alloy powder for cooling and absorbing hydrogen, put it in the ball mill po...

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Abstract

The invention relates to a preparation method of diffusion bonding titanium powders, in particular to a method for producing powders for high performance powder metallurgy titanium alloys. The preparation method comprises the following steps that coarse particle titanium powders and elemental powders or alloy powders are used as raw materials to be mixed according to the proportion of required components, obtained mixed powders are subjected to diffusion bonding treatment, and hydrogen is introduced to form titanium hydride; and then the titanium hydride is taken out of a furnace, ball millingand crushing are carried out to obtain powders with the required particle size, and finally dehydrogenating is carried out to obtain the diffusion bonding titanium alloy powders. According to the preparation method, the cost of titanium alloy powders is obviously reduced, and the cost is only 1/10-1/2 that of the prior art; the preparation method has the advantages of low equipment requirement, less fixed asset investment, high production efficiency and simple and controllable production process; obtained products have low oxygen content and few impurities; and products obtained after sintering have stable performance, low oxygen content and uniform component structures.

Description

technical field [0001] The invention relates to a method for preparing diffusion bonding titanium powder, in particular to a method for producing powder for high-performance powder metallurgy titanium alloy. Background technique [0002] Titanium alloy has a series of advantages such as low density, high specific strength, corrosion resistance, weldability, good medium temperature performance, and non-magnetism. It is widely used in aerospace, nuclear energy and chemical industries, and is an important metal material with wide application. Due to the poor processing performance of titanium alloy itself, traditional processes such as forging, precision casting, etc., are costly and low in production efficiency. Powder metallurgy is a near net shape technology using metal powder as raw material, usually including powder preparation, pressing, sintering, post-processing and other processes. Because this technology can realize the near-net shape of titanium products without pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C14/00B22F3/10B22F9/02
CPCB22F9/04B22F3/1021B22F9/023C22C14/00B22F2009/043B22F2009/001B22F1/14B22F1/142
Inventor 周承商段中元刘咏
Owner CENT SOUTH UNIV
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