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Preparation method of titanium or titanium alloy powder with micro-hydrogenated surface

A titanium alloy and powder technology, which is applied in the field of preparation of titanium or titanium alloy powder, can solve the problem of uncontrollable hydrogen absorption process of double-layer atomization nozzles, achieve good fluidity and oxidation resistance, improve safety, and reduce pollution Effect

Active Publication Date: 2017-05-10
NANJING UNIV OF SCI & TECH +3
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art above, and to provide a method for preparing titanium or titanium alloy powder with slightly hydrogenated surface, which not only solves the problem that the hydrogen absorption process of the double-layer atomization nozzle is uncontrollable, but also improves the manufacturing process. security

Method used

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  • Preparation method of titanium or titanium alloy powder with micro-hydrogenated surface
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  • Preparation method of titanium or titanium alloy powder with micro-hydrogenated surface

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preparation example Construction

[0017] A method for preparing surface micro-hydrogenated titanium or titanium alloy powder is carried out according to the following steps:

[0018] (1) According to milling needs and equipment requirements, such as figure 1 , Prepare low-pollution and specific size titanium or titanium alloy rods 5 in advance;

[0019] (2) Pre-evacuate the melting chamber 1, atomization chamber 3 and cyclone 9 in the atomization device, and wait until the vacuum degree reaches 1×10 -4 ~1×10 -2 Pa, filled with 0.09MPa high-purity inert gas protection through the atomization gas valve 2 to prevent the oxidation of the powder during the atomization process;

[0020] (3) The lower end of the titanium or titanium alloy rod 5 is heated and melted by the induction coil 6, and a stable liquid flow is formed by controlling the feeding rod 4, and then atomized and powdered through the atomizing nozzle 7 using high-purity inert gas as the medium , The atomization pressure is controlled at 3~8MPa;

[0021] (4) T...

Embodiment 1

[0025] The crucible-free gas atomization method was used to prepare Ti-6Al-4V(TC4) alloy powder with surface micro-hydrogenation.

[0026] Take the TC4 titanium alloy rod with a diameter of 40mm and an impurity content of less than 0.1% as the raw material, pre-evacuate the atomization equipment until the vacuum degree reaches 1×10 -4 Pa, filled with 0.09MPa high-purity argon protection to prevent oxidation. The lower end of the titanium alloy rod is heated and melted by the induction coil to form a stable liquid flow, and then the powder is atomized through an atomizing nozzle using high-purity argon as the medium. The atomization pressure is controlled at 5-7MPa, and the atomization is completed. Titanium alloy powder is carried into the cyclone separator by airflow. The lower part of the cyclone separator is fed with a 0.3MPa hydrogen content of 10at.% hydrogen and argon mixed gas. The position of the air inlet should be 10cm higher than the exhaust port in the cyclone. And us...

Embodiment 2

[0028] The crucible-free gas atomization method prepares Ti-45Al-2Cr-8Nb alloy powder with micro-hydrogenation on the surface.

[0029] Take Ti-45Al-2Cr-8Nb titanium alloy rod with a diameter of 40mm and an impurity content of less than 0.1% as the raw material, pre-evacuate the atomization equipment until the vacuum degree reaches 1×10 -4 Pa, filled with 0.09MPa high-purity helium to protect it from oxidation. The lower end of the titanium alloy rod is heated and melted by the induction coil to form a stable liquid flow, and then the powder is atomized through an atomizing nozzle with high-purity helium as the medium, and the atomization pressure is controlled at 6-8MPa, and the atomization is completed Titanium alloy powder is carried into the cyclone separator by the air flow. The lower part of the cyclone separator is fed with a mixture of hydrogen and helium with a hydrogen content of 0.5 MPa and 25 at.%. The position of the air inlet should be 20 cm higher than the exhaust p...

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Abstract

The invention relates to a preparation method of titanium or titanium alloy powder with micro-hydrogenated surface. The method comprises the following steps: (1) a titanium or titanium alloy bar with low pollution and specific size is prepared in advance; (2) an atomizing unit is pre-vacuumized and then filled with high-purity inert gas as shielding gas; (3) the lower end of the titanium or titanium alloy bar is heated to be melted by an induction coil, and atomized power preparation is performed; (4) titanium or titanium alloy powder obtained after atomization enters a cyclone separator, hydrogen is introduced into the cyclone separator, and low-temperature surface micro-hydrogenation treatment is finished in the cyclone separator; (5) after the powder is cooled completely, the titanium or titanium alloy powder with micro-hydrogenated surface is taken from a powder collecting tank. Aiming at the problem of high probability of oxidation of titanium or titanium alloy powder surface, crucible-free atomization and low-temperature surface micro-hydrogenation are combined, and the titanium or titanium alloy powder with the micro-hydrogenated surface, little pollution and excellent oxidation resistance for 3D printing is prepared.

Description

Technical field [0001] The invention relates to a preparation method of surface micro-hydrogenated titanium or titanium alloy powder, which belongs to the field of material preparation. Background technique [0002] The gas atomization method is a method of directly crushing and rapidly cooling molten metal to prepare metal powder by high-speed airflow. Its application is extremely wide, especially for the production of metal powder for 3D printing. 3D printing refers to the technology of manufacturing three-dimensional solid objects through the accumulation of materials layer by layer based on digital models, and represents a new direction for the development of the world's manufacturing industry. In order to ensure the density and uniformity of the internal structure of metal objects prepared by using 3D printing technology, they have high requirements on the particle size distribution, sphericity and fluidity, and oxygen content of the metal powder used. [0003] Titanium alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B33Y70/00
CPCB22F9/082B22F2009/0844B33Y70/00
Inventor 杜宇雷卢晓阳廖文和赵明韬王顺
Owner NANJING UNIV OF SCI & TECH
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