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Purification method of titanium alloy spherical powder for low-temperature resistant structural member

A spherical powder and titanium alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems that affect the low temperature performance of alloy structural parts, the sealing system cannot completely isolate the outside air, and contact with air, so as to ensure the vacuum degassing efficiency Effect

Active Publication Date: 2018-04-03
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the low-temperature performance of the alloy is very sensitive to gas elements such as C, O, and H, it is necessary to ensure that the above-mentioned gas elements are at a low level. The usual gas atomization method and plasma rotating electrode method powder making process need to be in a protective atmosphere. The metal is melted, but the protective atmosphere cannot be absolutely pure, and the entire sealing system cannot completely isolate the outside air
In addition, there is also the possibility of exposure to air during the subsequent screening and packaging of the powder
Therefore, the increase of gas element content in alloy powder is unavoidable, which significantly affects the low temperature performance of alloy structural parts

Method used

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  • Purification method of titanium alloy spherical powder for low-temperature resistant structural member
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Examples

Experimental program
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Effect test

Embodiment 1

[0020] see figure 1 A method for purifying titanium alloy spherical powder for low temperature resistant structural parts, comprising the following steps:

[0021] 1) Put the Ti-5A1-2.5Sn alloy spherical powder 4 prepared by the gas atomization method in an open titanium alloy cylinder, and the container mouth is covered with a screen whose mesh diameter is smaller than the minimum particle size of the powder;

[0022] 2) Place the container in a vacuum chamber with a heatable rotating device, evacuate the vacuum chamber 1, and rotate the titanium alloy cylinder 3 at the same time;

[0023] 3) When the pressure in the vacuum chamber is less than 10 -3 Pa, turn on the heating system, heat the powder to 600°C for 8 hours, and keep the pressure in the vacuum chamber less than 10 -2 Pa;

[0024] 4) After the holding time is over, turn off the heating system, and when the temperature of the powder drops below 75°C, open the vacuum chamber, take out the powder and vacuum pack it....

Embodiment 2

[0029] A method for purifying titanium alloy spherical powder for low temperature resistant structural parts, comprising the following steps:

[0030] 1) Put the Ti-5A1-2.5Sn alloy spherical powder prepared by the plasma rotating electrode method in an open titanium alloy cylinder, and the container mouth is covered with a screen whose mesh diameter is smaller than the minimum particle size of the powder;

[0031] 2) Put the container in the vacuum chamber 1 with a heatable rotating device, evacuate the vacuum chamber, and rotate the titanium alloy cylinder at the same time;

[0032] 3) Wait until the pressure in the vacuum chamber is less than 5×10 -3 Pa, turn on the heating system, heat the powder to 800°C for 4 hours, and keep the pressure in the vacuum chamber less than 10 -2 Pa;

[0033] 4) After the holding time is over, turn off the heating system, and when the temperature of the powder drops below 50°C, open the vacuum chamber, take out the powder and vacuum pack it....

Embodiment 3

[0037] A method for purifying titanium alloy spherical powder for low temperature resistant structural parts, comprising the following steps:

[0038] 1) Put the Ti-5A1-2.5Sn alloy spherical powder prepared by the gas atomization method in an open titanium alloy cylinder, and the container mouth is covered with a screen whose mesh diameter is smaller than the minimum particle size of the powder;

[0039] 2) Place the container in a vacuum chamber with a heatable rotating device, evacuate the vacuum chamber, and rotate the titanium alloy cylinder at the same time;

[0040] 3) When the pressure in the vacuum chamber is less than 10 -4 Pa, turn on the heating system, heat the powder to 400°C for 4 hours, then raise the temperature to 700°C for 2 hours, and keep the pressure in the vacuum chamber less than 10 -3 Pa;

[0041] 4) After the holding time is over, turn off the heating system, and when the temperature of the powder drops below 25°C, open the vacuum chamber, take out t...

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Abstract

A purification method of titanium alloy spherical powder for a low-temperature resistant structural member comprises the following steps that (1) the Ti-5Al-2.5Sn alloy spherical powder prepared through a gas atomization method or a plasma rotating electrode method is placed in an open titanium alloy cylinder, and container openings are covered with sieves with the mesh diameter being smaller thanthe minimum particle size of the powder; (2) the container is placed in a vacuum chamber with a heating rotating device, the vacuum chamber is vacuumized, and meanwhile the titanium alloy cylinder isrotated; (3) after the pressure in the vacuum chamber is smaller than 10<-2> Pa, a heating system is started to enable the powder to be heated to 400-800 DEG C, heat preservation is conducted for 2-8h, and the pressure in the vacuum chamber is kept to be smaller than 10<-2> Pa; and (4) after heat preservation is finished, the heating system is shut down, after the temperature of the powder is decreased to 80 DEG C or below, the vacuum chamber is opened, and the powder is taken out and subjected to vacuum package. By purifying the powder through the purification method, the content of adsorbed gas on the surface of the alloy powder can be further decreased.

Description

technical field [0001] The invention belongs to the technical field of preparation of nonferrous metal powders, and in particular relates to a method for purifying spherical titanium alloy powders for low-temperature resistant structural parts. Background technique [0002] Ti-5A1-2.5Sn alloy (domestic brand TA7) can effectively improve the mechanical properties of the alloy at low temperature by reducing the content of interstitial elements such as C, O and H, and has good toughness, high strength and small notch sensitivity at low temperature As an engineering material that can be used under low temperature (liquid hydrogen) conditions, it has been widely used in the aerospace field and has become the material of choice for low temperature resistant structural parts such as aircraft cryogenic containers, structural pipes, and low temperature rotors of engines. Since most of the structural parts used at low temperature have complex shapes, they cannot be obtained by convent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCB22F2999/00B22F1/065B22F1/14B22F2201/20
Inventor 韩志宇陈小林闫飞刘洋瞿宗宏王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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