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Method for preparing metal powder by plasma spheroidizing

A technology of metal powder and spheroidization, which is applied in the field of alloy powder, can solve the problems of powder bulk density and fluidity not reaching the optimal state, and low spheroidization rate, so as to avoid high temperature sintering and product re-oxidation, and smooth surface , The effect of high bulk density

Inactive Publication Date: 2019-04-05
NANTONG JINYUAN INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of various metal powders by radio frequency plasma technology has many advantages, due to the defects of the process in the prior art, the spheroidization rate of the powder is low when the powder is processed by plasma, so that the bulk density of the powder and The fluidity has not reached the optimal state, therefore, the process in the prior art has a large room for improvement

Method used

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  • Method for preparing metal powder by plasma spheroidizing

Examples

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Effect test

Embodiment 1

[0050] A method for preparing metal powder by plasma spheroidization, comprising the following steps:

[0051] 1) Send the raw metal powder into a ball mill for grinding to obtain a single particle powder with good dispersibility and uniform particle size distribution, and then fully dry it; the particle size of the metal powder is 60 μm.

[0052] 2) Pre-vacuumize the melting chamber and atomization chamber, and the vacuum degree reaches 2×10 -2 Pa, after the melting chamber is filled with protective gas, the pressure is 0.4MPa, and then filled with argon;

[0053] 3) Metal powder is smelted in a graphite crucible, and the melting temperature is 120°C higher than the melting point of the metal; a metal melt is formed;

[0054] 4) A double-layer atomizing nozzle is used to atomize and hydrogenate the metal melt to make metal powder; the atomizing gas is helium, and the direction of helium injection is at a certain angle to the flow direction of the metal melt, and its range is...

Embodiment 2

[0060] A method for preparing metal powder by plasma spheroidization, comprising the following steps:

[0061] 1) Send the raw metal powder into a ball mill for grinding to obtain a single particle powder with good dispersibility and uniform particle size distribution, and then fully dry it. The particle size of the metal powder is 60-80 μm;

[0062] 2) Pre-vacuumize the melting chamber and atomization chamber, and the vacuum degree reaches 3×10 -2 Pa, after the melting chamber is filled with protective gas, the pressure is 0.5MPa, and then filled with helium;

[0063] 3) The metal powder is smelted in a graphite crucible, and the melting temperature is 130°C higher than the melting point of the metal to form a metal melt;

[0064] 4) A double-layer atomizing nozzle is used to atomize and hydrogenate the metal melt to make metal powder; the atomizing gas is helium, and the direction of helium injection is at a certain angle to the flow direction of the metal melt, and its ran...

Embodiment 3

[0070] A method for preparing metal powder by plasma spheroidization, comprising the following steps:

[0071] 1) Send the raw metal powder into a ball mill for grinding to obtain a single particle powder with good dispersibility and uniform particle size distribution, and then fully dry it; the particle size of the metal powder is 80 μm;

[0072] 2) Pre-vacuumize the melting chamber and atomization chamber, and the vacuum degree reaches 5×10 -2 Pa, after the melting chamber is filled with protective gas, the pressure is 0.60MPa, and then filled with the mixed gas of argon and helium;

[0073] 3) Metal powder is smelted in a graphite crucible, and the melting temperature is 140°C higher than the melting point of the metal; a metal melt is formed;

[0074] 4) A double-layer atomizing nozzle is used to atomize and hydrogenate the metal melt to make metal powder; the atomizing gas is helium, and the direction of the helium gas injection is at a certain angle to the flow directio...

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Abstract

The invention discloses a method for preparing metal powder by plasma spheroidizing. The method comprises the following steps of 1) feeding the raw metal powder into a ball mill for grinding, and fully drying; 2) carrying out pre-pumping vacuum treatment on a smelting chamber and an atomizing chamber, and filling inert gas; 3) smelting the metal powder to form a metal melt; and 4 ) atomizing and hydrogenating the metal melt by adopting a double-layer atomizing nozzle to prepare metal powder; 5) after the metal powder is cooled, and collecting the metal powder through cyclone separation; 6) establishing a stable operation argon plasma torch, feeding the metal powder into a core-part high-temperature zone of the plasma torch, and rapidly melting the metal powder to form metal molten drops; and 7) the metal molten drops enter the powder spheroidization chamber, and condensing to form spherical metal powder. According to the method for preparing the metal powder by the plasma spheroidizing, the atomization method and the plasma method are combined, the prepared metal powder is high in loose packing density, and the powder fluidity is obviously improved.

Description

technical field [0001] The invention relates to an alloy powder, in particular to a magnesium alloy powder and a preparation method thereof. Background technique [0002] In recent years, with the popularity of metal 3D printing technology, the quality requirements for 3D printing metal powders are getting higher and higher, mainly focusing on uniform and accurate metal components, good surface quality, and narrow particle size distribution (15 μm ~ 45 μm, 70 μm ~ 120μm), low oxygen content, good fluidity, etc. 3D printed metal powder products are mainly used in education, medical and aerospace fields. Compared with the initial development stage of 3D printing technology, the technology at this stage has made great progress. [0003] Duan's domestic and foreign research focuses on the particle size distribution of 3D printing metal powder and the oxygen content of the metal. At present, the relatively mature technology is the production of 3D printing metal spherical powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B33Y70/00
CPCB22F9/14B33Y70/00
Inventor 姜勇梁廷禹高凌霄
Owner NANTONG JINYUAN INTELLIGENT TECH CO LTD
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