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Method for preparing spherical metal powder under positive pressure cooling atmosphere environment

An atmosphere environment, metal powder technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the problems of difficult batching of alloy composition, powder composition deviation, slow cooling speed, etc., to avoid composition deviation and micro The effect of satellite powder, high sphericity and fast cooling speed

Inactive Publication Date: 2017-12-19
北京金航智造科技有限公司
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  • Application Information

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Problems solved by technology

However, this method is only suitable for alloy materials that can be prepared into wire materials, and it is difficult to batch batches for brittle materials or alloy components without commercial wire materials
Publication No. JP-A-2002-180112 patent and published literature "H.J.Hedger, A.R.Hall. Preparation of spherical powder [J]. PowderMetallurgy, 1961, 8:65", "P.Linke, S.Zakharian, K.-H.Weiss, G.Nutsch.Manufacturing of spherical Tungsten carbide powders with the thermal RF inductively coupled plasma", "Wang Jianjun, Hao Junjie, Guo Zhimeng, Wang Yuming. Spherical niobium powder prepared by radio frequency plasma, powder metallurgy materials science and engineering, 2014,19(3):361-366” and so on use radio frequency plasma to realize metal powder spheroidization, that is, use high temperature radio frequency plasma to heat and spheroidize the irregular powder entering it, but because the chamber body is In the negative pressure state, the cooling speed of the powder melted at high temperature is slow in the atmosphere, and there is a problem of selective evaporation of components, which causes the composition deviation of the powder

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  • Method for preparing spherical metal powder under positive pressure cooling atmosphere environment
  • Method for preparing spherical metal powder under positive pressure cooling atmosphere environment
  • Method for preparing spherical metal powder under positive pressure cooling atmosphere environment

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Experimental program
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specific Embodiment approach 1

[0030] Specific embodiment 1: adopt the present invention to prepare TC4 titanium alloy spherical powder;

[0031] 1) Using 5-35μm hydrodehydrogenated TC4 powder as raw material, the powder appearance is as follows image 3 shown;

[0032] 2) Send the above powder into the plasma generator 1, the plasma power is 80kW, the pressure in the chamber 2 is 0.3MPa, the gas used is a mixed gas of Ar and He (volume ratio is 1:3), and the flow rate of the cooling gas is 8m 3 / min, the powder carrier gas flow rate is 7l / min, and the powder feeding volume is 180g / min;

[0033] 3) Collect and detect the obtained spherical powder. Figure 4 For the morphology of the obtained TC4 alloy spherical powder, there is no obvious satellite powder on the powder surface, the spheroidization rate is 98%, and the powder particle size is 16-45 μm. Depend on figure 1 The composition comparison of the shown powders before and after spheroidization shows that the contents of Ti, Al, and V elements in t...

specific Embodiment approach 2

[0034] Specific embodiment 2: adopt the present invention to prepare spherical Nb521 alloy spherical powder;

[0035] 1) With a purity of 99.9% Nb powder with a Fischer particle size of 5 μm, a purity of 99.8% W powder with a particle size of 1-2 μm, a purity of 99.9% Mo powder below 5 microns, a purity of 99.9% with a particle size of 3-5 μm Zr powder as raw material;

[0036] 2) Mix the above raw materials according to the ratio of Nb-5W-2Mo-1Zr (wt.%) and add 1% of petroleum ether as an auxiliary agent for stirring mill processing at a speed of 500 rpm for 2 hours. The obtained powder has the following appearance: Figure 5 As shown, the average particle size of the powder after stirring and grinding is 4 μm;

[0037] 3) The above powder is subjected to centrifugal spray granulation (PVA water solvent, solid phase content 15%), and the appearance is as follows: Figure 6 Shown; the granulated powder of 35-90 μm obtained by sieving is degummed and sintered in a degumming a...

specific Embodiment approach 3

[0040] Specific embodiment 3: adopt the present invention to prepare spherical WNiFe alloy spherical powder;

[0041] 1) W powder with a purity of 99.8% and a particle size of 1-2 μm, Ni powder with a particle size of 5-8 μm, and carbonyl Fe powder with a particle size of 3-5 μm are used as raw materials;

[0042] 2) Mix the raw material powder according to the ratio of W-7Ni-3Fe (wt.%) and add 1% stearic acid as an auxiliary agent to carry out stirring mill processing, the rotation speed is 500rpm, and the time is 2h. The appearance of the obtained powder is as follows Figure 9 As shown, the average particle size of the powder after stirring and grinding is 3 μm;

[0043] 3) Perform centrifugal spray granulation (PVA ethanol solvent, solid phase content 10%) of the above-mentioned powder; sieve the granulated powder of 50-150 μm to carry out degumming and sintering in a degumming and sintering furnace (400 ° C degumming, 1300 ° C sintering 1h);

[0044] 4) Send the above p...

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Abstract

The invention relates to a method for preparing spherical metal, in particular to a method for preparing spherical metal powder under the positive pressure cooling atmosphere environment. The method comprises the following steps that (1) a plasma generator is prepared, and the plasma generator is placed above a cavity; (2) prepared to-be-nodulized powder raw materials are fed into the plasma generator, irregular to-be-nodulized powder raw materials heated by plasmas sent out from the plasma generator generate nodulizing under the effect of surface tension, and quick heat exchange with cooling gas and quick solidification after the to-be-nodulized powder raw materials enter the positive pressure environment are carried out; and (3) cooling air flow is fed into through a cooling air flow pipe, the to-be-nodulized powder raw materials are cooled and solidified under the effect of the cooling air flow to form spherical powder, and the cooled powder is collected through a container. The prepared metal powder is high in degree of sphericity, the interior is compact and fewer in defect, the mobility is good, and the method is suitable for short-period small-batch nodulizing production of multi-component alloy powder.

Description

technical field [0001] The invention relates to a method for preparing spherical metal powder, more specifically, a method for preparing spherical metal powder in a positive pressure cooling atmosphere environment. Background technique [0002] Metal 3D printing technology puts forward high requirements on raw material powders, and it is generally believed that powders with high sphericity, dense and defect-free are conducive to obtaining high-quality final products. At present, there are various preparation methods of spherical metal powders: for example, patents with publication numbers EP0400659A1 and CN2855596 disclose methods and devices for powder-making by argon atomization. The atomization pulverization method has been widely used in the production of titanium alloy, nickel-based alloy and aluminum alloy powder, with high output and fine powder yield. However, the obtained powder has many satellite powders. Usually atomized powder production has a deviation between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B22F1/00B33Y70/00
CPCB22F9/14B33Y70/00B22F1/065
Inventor 彭徽其他发明人请求不公开姓名
Owner 北京金航智造科技有限公司
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