Technological method and device for preparing high-purity spherical superfine/nanoscale powdered materials in plasma atomization mode

Abstract

The invention discloses a technological method and device for preparing high-purity spherical superfine / nanoscale powdered materials in a plasma atomization mode. The device comprises a feeding system, symmetric plasma torches, a vacuum system, a metal wire reel, metal wires, a plasma focus, an atomization tower, a powder collection device, a gas-powder separation system, a powder collection system and a gas purification cyclic utilization system, wherein the gas-powder separation system, the powder collection system and the gas purification cyclic utilization system are connected with the powder collection device. The technological method is characterized by comprising the steps that solid raw materials such as bars, wires and powder particle raw materials, or liquid raw materials or gas raw materials are utilized for being directly fed into a plasma focus area through a special feeding device, the plasma focus area is formed by the plasma torches, the temperature can reach up to 10000 K, the raw materials are instantly liquefied or vaporized or achieve thermal reaction decomposition / synthesis at the high temperature, and are dispersed and atomized by high-speed impact of plasma to form superfine liquid drops or aerial fog, in the flight sedimentation process in the atomization tower, heat exchange is conducted between the superfine liquid drops or aerial fog and cooling argon continuously fed into the atomization tower, and the superfine liquid drops or aerial fog is cooled and solidified into the various high-chemical-purity spherical superfine / nanoscale powdered materials.

Description

technical field [0001] The invention belongs to a method and equipment for preparing high-purity spherical ultrafine / nano powder materials by using high-temperature plasma, melting or vaporizing raw materials by high-temperature plasma, or decomposing and synthesizing by thermal reaction, and atomizing. [0002] Background technique [0003] With the development of metal 3D printing technology, surface cladding repair and remanufacturing technology, material surface spraying modification technology, and powder metallurgy parts manufacturing technology, the chemical purity, shape, density, fluidity, particle size and particle size of raw material powder products Distribution puts forward higher requirements. [0004] Today's production methods and equipment for powder products, such as gas atomization and water atomization or mechanical crushing production methods, require raw material crucible melting or mechanical crushing to contact the working surface, etc., there ar...

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Problems solved by technology

[0007] In order to overcome the shortcomings of the powder materials prepared by the current powder preparation methods, such as low chemical purity, particle size not reaching ultrafine and nanometer levels, high production costs, and inability to commercialize industrialization, the present invention provides a method using high-temperature argon, nitrogen, Method for preparing spherical ultrafine / nano powder material with high chemical purity by oxygen plasma atomization method

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