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A kind of preparation method of surface micro-hydrogenated titanium or titanium alloy powder

A technology of titanium alloy and powder, 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 nozzle, achieve good fluidity and oxidation resistance, less pollution, and improve safety Effect

Active Publication Date: 2018-12-14
NANJING UNIV OF SCI & TECH +3
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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

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  • A kind of preparation method of surface micro-hydrogenated titanium or titanium alloy powder
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  • A kind of preparation method of surface micro-hydrogenated titanium or titanium alloy powder

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preparation example Construction

[0017] A kind of preparation method of the titanium or titanium alloy powder of surface slight hydrogenation, carry out according to the following steps:

[0018] (1) According to milling needs and equipment requirements, such as figure 1 , pre-preparing titanium or titanium alloy rods with low pollution and specific dimensions 5;

[0019] (2) Pre-evacuate the interior of the melting chamber 1, atomization chamber 3 and cyclone separator 9 in the atomization device until the vacuum degree reaches 1×10 -4 ~1×10 -2 Pa, filled with 0.09 MPa high-purity inert gas protection through the atomizing 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 by the atomizing nozzle 7 using high-purity inert gas as the medium , the atomization pressu...

Embodiment 1

[0025] Surface slightly hydrogenated Ti-6Al-4V (TC4) alloy powder prepared by crucible-free gas atomization method.

[0026] Using TC4 titanium alloy rods with a diameter of 40mm and an impurity content of less than 0.1% as raw materials, pre-evacuate the atomization equipment until the vacuum degree reaches 1×10 -4 Pa, filled with 0.09 MPa 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 atomized and powdered through the atomizing nozzle with high-purity argon as the medium, the atomizing pressure is controlled at 5-7 MPa, and the atomization is completed The titanium alloy powder is carried into the cyclone separator by the air flow, and the lower part of the cyclone separator is fed with a mixed gas of hydrogen and argon with a hydrogen content of 10 at.% at 0.3 MPa. The position of the air inlet should be higher than the exhaust port in the cyclone se...

Embodiment 2

[0028] Surface slightly hydrogenated Ti-45Al-2Cr-8Nb alloy powder prepared by crucible-free gas atomization method.

[0029] Using Ti-45Al-2Cr-8Nb titanium alloy rods with a diameter of 40mm and an impurity content of less than 0.1% as raw materials, pre-evacuate the atomization equipment until the vacuum degree reaches 1×10 -4 Pa, filled with 0.09 MPa high-purity helium 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 atomized and powdered through the atomizing nozzle with high-purity helium as the medium, the atomizing pressure is controlled at 6~8 MPa, and the atomization is completed The titanium alloy powder is carried into the cyclone separator by the air flow, and the lower part of the cyclone separator is fed with a mixed gas of hydrogen and helium with a hydrogen content of 25 at.% at 0.5 MPa. The position of the air inlet should be higher than the exhaust port in...

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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 slightly 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. It is widely used, especially for the production of metal powder for 3D printing. 3D printing refers to the technology of manufacturing three-dimensional solid objects by accumulating materials layer by layer based on digital models, which 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 3D printing technology, the particle size distribution, sphericity and fluidity, and oxygen content of the metal powder used have high requirements. [0003] Titanium alloy is widely used in aerospace a...

Claims

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Application Information

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Patent Type & Authority Patents(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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