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Method for producing metal powder by isoionic atomization

A technology of metal powder and plasma, applied in the field of powder metallurgy, can solve problems such as complex process, environmental pollution, and long process, and achieve the effect of simple process, good fluidity and short process

Inactive Publication Date: 2010-09-22
张耀平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the disadvantages of complex process, long process, high energy consumption and relatively large pollution to the environment in the current production of metal powder, the present invention proposes a method for producing metal powder by plasma spraying

Method used

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  • Method for producing metal powder by isoionic atomization
  • Method for producing metal powder by isoionic atomization
  • Method for producing metal powder by isoionic atomization

Examples

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Embodiment 1

[0016] Embodiment 1: the production of stainless steel powder, use the electric current of 35V, 400A to generate plasma electric arc, make the stainless steel block instantly melt into liquid state, then add 2 cubic meters / per minute of air injection, then add 21000 cubic meters / per minute of air Cooling, lowering to below 100°C, rapidly cooling into powders of various finenesses, and then performing gas-solid separation and recovery.

Embodiment 2

[0017] Embodiment 2: the production of silver powder, produce plasma arc with the electric current of 35V, 380A, make the silver block melt into liquid state instantly, then add 1.9 cubic meters / per minute of air injection, then add 20000 cubic meters / per minute of air cooling , down to below 100°C, rapidly cooled into powders of various finenesses, and then gas-solid separation and recovery.

Embodiment 3

[0018] Embodiment 3: the production of nickel powder, produce plasma arc with the electric current of 35V, 350A, make the nickel piece melt into liquid state instantly, add the air injection of 1.8 cubic meters / per minute again, then add the air of 19000 cubic meters / per minute Cooling, lowering to below 100°C, rapidly cooling into powders of various finenesses, and then performing gas-solid separation and recovery.

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Abstract

The invention relates to a method for producing metal powder by isoionic atomization. The method comprises the following steps of: instantaneously increasing the temperature of metal from a room temperature to over 5000k by utilizing an isoionic electric arc; melting the metal raw material into a liquid state; blowing the liquid metal into powder by utilizing air; then, adding a great amount of cooling air to decrease the temperature to below 100 DEG C; and finally, separating solid and liquid and recovering. The isoionic atomization technology has simple powder-preparing process, short flow, instantaneous completion, less man-made quality-influencing factors, low electric energy and less man hours. By using the method, aluminum, copper, iron, nickel, silver and stainless steel powder are successfully prepared. The invention has the advantages of wide powder preparation range covering heavy and light nonferrous metal, noble metal, and the like, simple process, one-step completion, good product quality, high purity reaching 99.9 percent, superfine grain diameter from 1 mm to 1 millimicron and even spherical grains, and all powder products have good fluidness without generating three wastes.

Description

technical field [0001] The present invention relates to powder metallurgy, ie the method of producing metal powders by plasma spraying. Background technique [0002] At present, the production methods of metal powder are mainly atomization method, chemical method, electrolysis method and mechanical grinding method. Such as Canada's world-famous INCO carbonyl nickel powder legally produced nickel hydroxy powder. Carbonyl iron powder produced by carbonyl iron powder from BASF, Germany. These processes are very complicated, have a long process, consume high energy, and cause great pollution to the environment. Contents of the invention [0003] In order to overcome the disadvantages of complex process, long flow process, high energy consumption and relatively large pollution to the environment in the current production of metal powder, the present invention proposes a method for producing metal powder by plasma spraying. [0004] The method for producing metal powder by pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
Inventor 张耀平曹慧君刘秋富田和富李强真易汉全
Owner 张耀平