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Method for preparing copper alloy powder by means of plasma rotating electrode

A technology of rotating electrodes and copper alloys, applied in the direction of additive processing, etc., can solve the problems of low powder sphericity, poor fluidity, and many satellites, and achieve the effects of high powder quality, less gas inclusions, and narrow particle size range

Inactive Publication Date: 2019-03-26
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, gas atomization powder making technology is mostly used, and the obtained powder has low sphericity, many satellite balls, and poor fluidity.

Method used

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  • Method for preparing copper alloy powder by means of plasma rotating electrode
  • Method for preparing copper alloy powder by means of plasma rotating electrode
  • Method for preparing copper alloy powder by means of plasma rotating electrode

Examples

Experimental program
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Effect test

Embodiment 1）

[0026] see figure 1 , the method for preparing copper alloy powder by the plasma rotating electrode of the present embodiment comprises the following steps:

[0027] ①According to the composition (mass fraction) of the copper alloy powder to be prepared (mass fraction) Al 9% to 13%, Ni 12% to 18%, Fe 8% to 12%, and the balance is Cu to carry out the batching (in this embodiment, it is Al 11.9%, Ni 15%, Fe 10%, the balance is Cu).

[0028] The specific composition of the copper alloy given here is only an example, and the method of the present invention can also prepare copper alloy powders with other compositions.

[0029] Vacuum induction furnace is used to melt the ingot and then forge it, and then machine it into a forged alloy bar with a dense structure. The specifications of the alloy bar are 40-60mm in diameter (50mm in this embodiment) and 400-900mm (400mm in this embodiment), surface roughness ≤ 3.2µm (0.8µm in this embodiment), relative density of the alloy bar ≥ 95...

Embodiment 2）

[0040] The plasma rotating electrode of the present embodiment prepares the method for copper alloy powder all the other and embodiment 1 is identical, difference is:

[0041]③ Turn on the plasma rotating electrode powder making equipment, set the speed of the alloy rod to 20000r / min, the current and voltage of the plasma gun are: current 2000A, voltage 110V, the short distance between the gun and the bar is 3mm, and the feed speed is less than 1mm / s.

[0042] After the powder of this example is sieved through a 325-mesh sieve, the powder yield of 45-105 μm is 53%.

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Abstract

The invention discloses a method for preparing copper alloy powder by means of a plasma rotating electrode. The method comprises the steps that firstly, batching is conducted according to the chemicalproportion of copper alloy components, and alloy bars are machined and manufactured through a smelting and forging machine; the alloy bars are put into plasma rotating electrode powder preparation equipment, and a powder preparation chamber of the equipment is filled with inert protective gas after being evacuated; and the equipment is started, the ultrahigh-speed alloy bars are molten into liquid through heating of a plasma arc heat source, the liquid is cast out and crushed into high-temperature small liquid drops under the action of centrifugal force, and the small liquid drops are solidified into spheres under the surface tension action in the quick condensation process and fall into a powder collector. According to the method for preparing the copper alloy powder by means of the plasma rotating electrode, the copper alloy powder is prepared by adopting a high-speed plasma rotating electrode technology, and the prepared copper alloy powder is high in sphericity degree, narrow in particle size range, low in content of hollow powder and satellite powder, low in content of gas inclusions and high in powder quality, has the excellent physical, chemical and comprehensive mechanicalproperties, and is especially suitable for being used in an electron beam powder spreading type additive manufacturing technology.

Description

technical field [0001] The invention relates to a process for preparing copper alloy powder raw materials for additive manufacturing, in particular to a method for preparing copper alloy powder for electron beam forming by a plasma rotating electrode. Background technique [0002] Additive manufacturing technology characterized by digitalization, networking, personalization, and customization is rapidly changing traditional production methods and lifestyles, and is bound to promote the third industrial revolution. In recent years, additive manufacturing equipment has gradually matured, but currently there are few types of materials used for additive manufacturing and unstable performance, which has become a bottleneck restricting the development and application of this technology. At present, most customized high-end metal powders mainly rely on imports, while foreign manufacturers often bundle raw materials and equipment at high prices, which greatly restricts the developme...

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 王晓明赵阳黄柯朱胜王思捷韩国峰石晶常青李华莹任智强滕涛
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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