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Apparatus for producing refractory compound powders

a technology of refractory compound and powder, which is applied in the field of making refractory compound powder materials, can solve the problems of insufficient dwell time of droplets in a typical atomization system for complete transfer of metal droplets, and achieve the effect of being easily adapted to produ

Inactive Publication Date: 2013-09-12
LIU BO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0012]The apparatus and method described in his invention can be easily adapted to produce many different powders by adjusting the reaction

Problems solved by technology

While the heat released from the liquid metal and the compound forming reaction maintains the reaction chamber in high temperature, and at this high temperature, the surface layer of metal droplets can qui

Method used

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  • Apparatus for producing refractory compound powders
  • Apparatus for producing refractory compound powders
  • Apparatus for producing refractory compound powders

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Embodiment Construction

[0019]FIG. 1 schematically shows a two stage atomization apparatus with a reaction time enhancer, which is a preferred embodiment for use in the practice of current invention for producing refractory compound powders. Besides the vacuum reaction chamber, this apparatus includes three major functional components: (1) the heating unit and the first stage atomizer with inert gas; (2) the second stage atomizing means with reactive gas or diluted reactive gas and (3) the reaction time enhancer that facilitates a reactive gas flow in the reverse direction of falling powders. The reactive gas flow in the reverse direction can force the falling powder travel back to the reaction chamber, thus to increase the reaction time between metal powders and the reactive gas. This reaction time enhancer allows more complete transforming of metal droplets into refractory compound powders.

[0020]In the first-stage heating and atomizing means, a heating setup for melting a metal composition is provided. T...

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Abstract

A gas atomization apparatus is disclosed for producing high purity fine refractory compound powders. After the system reaches high vacuum, a first stage inert atomizing gas breaks superheated metal melt into droplets and a second stage reactive atomizing gas breaks the droplets further into ultrafine droplets while reacts with them to form refractory compound powders. The first stage atomizing gas is inert gas able to break up melt into droplets and prevent crust formation on the nozzle front. A reaction time enhancer is arranged at bottom of reaction chamber to furnish a reactive gas flow in a reverse direction of the falling droplets and powders. Under the reverse gas flow, the falling droplets and powders change moving direction and travel longer distance in reaction chamber to increase reaction time. This apparatus can produce refractory powders with ultrahigh purity and uniform powder size while maintain high process energy efficiency.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method and apparatus of making refractory compound powder materials, especially the realization of amorphous, polycrystalline or nanocrystalline refractory compound powders through gas atomization reaction synthesis between a metal melt and reactive atomizing gas in an atomization reaction chamber. This invention uses inert gas as the first stage atomization gas to prevent crust formation on the fronts of source metal and injection nozzle, and uses reactive gas in the second stage of atomization to break up the already atomized metal droplets further into even finer droplets while to react with the droplets to form refractory compound powders. An reaction time enhancer is provided to increase the reaction time between metal droplets and reactive gas in the reaction chamber. This apparatus and method can be used to produce many types of compound powders through reaction of liquid metal melt with different atomization gase...

Claims

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Application Information

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IPC IPC(8): B22F9/08
CPCB22F9/08B22F2009/0824B22F2999/00B22F2201/10C01B13/326C01B17/20C01B21/06C01B21/0602C01B6/00C01B6/24C01B9/00
Inventor LIU, BO
Owner LIU BO
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