A method for reducing the oxygen content of titanium powder produced by hydrodehydrogenation

A technology of hydrogenation dehydrogenation and oxygen content, applied in the field of powder metallurgy, can solve the problems of large specific surface area of ​​titanium powder, restricting the application range, excessive impurity content, etc., and achieve the effect of fast reaction speed, sufficient reduction reaction and strong reactivity

Active Publication Date: 2022-05-24
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the process of this method is long, and the titanium powder produced has a large specific surface area and irregular shape, and it is very easy to react with oxygen to cause the impurity content to exceed the standard.
Oxygen content is a key parameter of titanium powder, and the defects in the purity of titanium powder prepared by hydrogenation dehydrogenation seriously restrict its application range

Method used

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  • A method for reducing the oxygen content of titanium powder produced by hydrodehydrogenation
  • A method for reducing the oxygen content of titanium powder produced by hydrodehydrogenation
  • A method for reducing the oxygen content of titanium powder produced by hydrodehydrogenation

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Embodiment 1

[0046] (1) The gaseous metal sodium is fed into the inductively coupled plasma torch with the mixed gas A as the working gas and the side gas at a rate of 2 g / min, and the metal sodium is excited and ionized to obtain a strong reducing inductively coupled plasma torch. Gas A is composed of helium and argon in a volume ratio of 1:9. The operating power of the plasma torch is 135kW, the temperature of the plasma torch is 12000K, the working gas flow is 60slpm, the side gas flow is 350slpm, and the system pressure is 30kPa;

[0047] (2) Using the mixed gas A as the powder feeding gas, the titanium powder with a particle size range of 30-50 microns and an oxygen content of 3500 ppm is prepared by a hydrogenation dehydrogenation method (see figure 1 ) into the strongly reducing inductively coupled plasma torch established in step (1) in a fluidized state, the powder feeding rate is 40 g / min, after the titanium powder is melted, the oxygen element reacts with the active metal in the ...

Embodiment 2

[0050] (1) The liquid sodium-potassium alloy is fed into the inductively coupled plasma torch with the mixed gas A as the working gas and the side gas at a rate of 3 g / min, and the metal sodium is excited and ionized to obtain a strong reducing inductively coupled plasma torch, Mixed gas A is composed of helium and argon in a volume ratio of 3:22. The operating power of the plasma torch is 140kW, the temperature of the plasma torch is 13000K, the working gas flow is 70slpm, the side gas flow is 400slpm, and the system pressure is 37kPa;

[0051] (2) Using the mixed gas A as the powder feeding gas, the titanium powder with a particle size range of 70 to 120 microns and an oxygen content of 2700 ppm, prepared by a hydrogenation dehydrogenation method, is fed into a fluidized state to create a strong reducing sensitivity in step (1). The plasma torch should be coupled, and the powder feeding rate is 60g / min. After the titanium powder is melted, the oxygen element in it reacts with...

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Abstract

The embodiment of the present invention provides a method for reducing the oxygen content of titanium powder obtained by hydrodehydrogenation, which belongs to the technical field of powder metallurgy. In the method, an active metal is sent into an inductively coupled plasma torch to excite ionization to obtain a strongly reducing inductively coupled plasma torch, and the working gas and edge gas of the inductively coupled plasma torch are both helium and argon mixed gases A: Using the mixed gas A as the powder feeding gas, the titanium powder obtained by the hydrodehydrogenation method is sent into the strongly reducing inductively coupled plasma torch established in step (1) in a fluidized state, and the titanium powder is melted and detached from the The strong reduction inductively coupled plasma torch is described, and the reduced titanium powder is obtained by sedimentation and cooling; the obtained reduced titanium powder is first washed to remove the residual active metal and its oxide attached to the surface, and the titanium powder is filtered out and then washed. After filtering and drying, low-oxygen titanium powder is obtained. The method can reduce the oxygen content of the hydrogenated dehydrogenation titanium powder from the order of several thousand ppm to the order of hundreds of ppm.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, and particularly provides a method for reducing the oxygen content of titanium powder prepared by a hydrogenation dehydrogenation method. Background technique [0002] Titanium has excellent properties such as low density, high strength and corrosion resistance, and has been widely used in military and civilian fields such as aerospace, weapons and ships, mechanical vehicles, energy and environmental protection. The production and processing costs of titanium materials are high. The near-net-shape process can improve the utilization rate of titanium materials and reduce production costs. It has obvious advantages in preparing high-performance parts with complex shapes and uniform structures. It is currently the most promising titanium processing. one of the crafts. [0003] Titanium powder is the raw material of the near-net-shape process. At present, the main preparation methods of ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/14B22F9/02
CPCB22F9/14B22F9/023
Inventor 刘金涛欧东斌董永晖朱兴营周法
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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