Plasma atomization method and apparatus for preparing pure titanium or titanium alloy powder

A kind of atomization equipment, titanium alloy technology, applied in the field of preparation of titanium or titanium alloy powder, can solve the problem that the powder has not been studied in depth, achieve no adhesion/agglomeration phenomenon, prevent agglomeration and adhesion, and reduce the quantity Effect

Active Publication Date: 2017-02-08
OPTIMAL MATERIAL TECH CO LTD
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Problems solved by technology

[0009] It can be seen that the above methods all use the plasma atomization method to prepare metal powder, and no in-depth research has been carried out on the cooling of the powder after atomization. Due to the particularity of titanium powder, the above method is used to prepare titanium or titanium alloy powder, and the obtained Powder particle size distribution, morphology, etc. need to be further improved

Method used

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  • Plasma atomization method and apparatus for preparing pure titanium or titanium alloy powder
  • Plasma atomization method and apparatus for preparing pure titanium or titanium alloy powder
  • Plasma atomization method and apparatus for preparing pure titanium or titanium alloy powder

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Embodiment 1

[0073] 1. Raw material preparation stage

[0074] The round pure titanium wire with a diameter of 8mm is selected as the raw material for powder making. Each batch of raw materials has a test material certificate, which meets the requirements of the American Society for Testing and Materials ASTM on chemical composition.

[0075] 2. Vacuumization and argon filling stage of atomization chamber 2

[0076] Before melting and atomization, use a vacuum device to remove the air in the atomization chamber 2, and after the inside reaches a vacuum of 40kPa, then fill it with argon to normal pressure, so that the initial oxygen and oxygen in the atomization chamber 2 The initial nitrogen content is less than 0.1%. The oxygen and nitrogen content detector 8 is used to detect the content of oxygen and nitrogen during the whole working process, so that the melting and atomization process can be carried out in a low oxygen and low nitrogen environment. When the oxygen and nitrogen content ...

Embodiment 2

[0090] A round Ti6Al4V wire with a diameter of 8 mm was selected as the powder-making raw material, and the titanium alloy powder was prepared by adopting the method in Example 1, only changing some parameters. Among them, the changed parameters are:

[0091] During the vacuuming and argon filling stages of the atomization chamber 2, the initial oxygen and nitrogen content is lower than 0.08%, and when the oxygen and nitrogen content exceeds 0.2%, it will automatically alarm and interrupt the working process.

[0092] In the stage of melting and atomization, the feeding speed of wire is 0.08m / s, the power of plasma torch is 40kW, and the jetting speed of hot gas flow at the torch port is 20L / min.

[0093] In the powder cooling stage, the air pressure at the air inlet 210 is 0.5Mpa, and the temperature of the cooling gas is maintained at 300-320°C.

[0094] The Ti6Al4V alloy powder prepared as Figure 5 As shown, it is highly spherical, with uniform particles and few satellit...

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Abstract

The invention relates to a plasma atomization method and apparatus for preparing spherical pure titanium or titanium alloy powder, and belongs to the technical field of preparation of titanium or titanium alloy powder. The plasma atomization method for preparing pure titanium or titanium alloy powder comprises the following steps of (1) preparing a titanium wire or titanium alloy wire with the diameter ranging from 3 millimeters to 20 millimeters, (2) using a plasma torch to fuse and atomize the titanium wire or titanium alloy wire in an atomization bin with an argon atmosphere to obtain atomized pure titanium particles or titanium alloy particles, and (3) feeding argon flow with the temperature ranging from 300 DEG C to 500 DEG C into the atomization bin, carrying out laminar cooling on the atomized pure titanium particles or titanium alloy particles to obtain pure titanium or titanium alloy powder. The obtained powder is good in degree of sphericity and low in the content of satellite balls, and has the advantages of being uniform in size distribution, high in purity and degree of sphericity, good in liquidity, low in oxygen content and impurity content, free of bond or cluster phenomenon and the like. The prepared titanium powder can be widely applied to the forming manners such as metal additive manufacturing, powder injection moulding and hot isostatic pressing for manufacturing parts with high precision.

Description

technical field [0001] The invention relates to a plasma atomization method and equipment for preparing pure titanium or titanium alloy powder, and belongs to the technical field of preparation of titanium or titanium alloy powder. Background technique [0002] Pure titanium and titanium alloys are widely used in aerospace manufacturing, dental processing and orthopedic implant processing because of their low density, high specific strength, good corrosion resistance, good mechanical properties, and excellent biocompatibility. However, the machinability of titanium alloy is poor, and it is difficult to cut. In thermal processing, it is very easy to absorb impurities such as hydrogen, oxygen, nitrogen, carbon, etc., poor wear resistance, and the production process is complicated. Therefore, metal 3D printing, powder injection molding, hot isostatic pressing and other powder metallurgy methods are the most common methods for preparing high-precision parts in these fields, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0844B22F2009/0876
Inventor 刘睿诚吴利苹蒋安琪曾益伟王强陈玲莉陈军
Owner OPTIMAL MATERIAL TECH CO LTD
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