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

A technology of nano powder and process method, applied in the direction of nano technology, which can solve the problems of low chemical purity, particle size not reaching ultrafine and nano level, high production cost, etc., and achieve the effect of high purity and concentrated particle size distribution

Inactive Publication Date: 2014-05-07
王利民
8 Cites 47 Cited by

AI-Extracted Technical Summary

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 inabili...
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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.

Application Domain

Technology Topic

Chemical purityPlasma torch +13

Image

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

Examples

  • Experimental program(1)

Example Embodiment

[0013] Specific embodiment: Process method and equipment for producing high-purity ultrafine metal Ti-6Al-4V (TC4) spherical powder using coiled wire raw materials.
[0014] 1. Establish a plasma atomization equipment system. The whole system is mainly composed of 60kw plasma power supply, 2 symmetrical plasma moments 2, argon gas source, atomization tower 7, vacuum system 3, roller metal coil wire conveying system 1, gas powder Separation system, powder collection system, gas purification and recycling system, etc.; the symmetrical plasma rectangle forms a high-temperature plasma concentration focal zone 6, see figure 1.
[0015] 2. In order to prevent the titanium alloy material from oxidizing during heating, first extract the air from the atomization tower and pass in the protective cooling argon gas.
[0016] 3. Select commercialized 5mm Ti-6Al-4V (TC4) coiled wire, and send it to the focal area of ​​high temperature argon plasma through the metal coiled wire conveying system. The conveying speed is controllable and adjustable. The titanium alloy wire is at a high temperature of about 2500K. The focal area is melted instantaneously, and the plasma is impacted at high speed and dispersed and atomized into ultra-fine droplets. The droplets exchange heat with the cooling argon gas passing into the atomization tower during the flight in the atomization tower and cool and solidify into ultra-fine powder particles. , The average particle size of the powder is usually 1-100um.
[0017] 4. The gas powder enters the cyclone separation and bag filter system for gas and powder separation, and the ultra-fine titanium alloy powder is collected.
[0018] 5. The filtered argon gas is recovered and pressurized through the gas purification recycling system and becomes the working gas source again.
[0019] In the above process, the temperature of the argon plasma is controlled, so that the titanium alloy wire can be instantly vaporized at an ultra-high temperature above 5000K, and the high-speed impact of the plasma is dispersed and atomized into a metal cloud, and the cooling argon is continuously passed into the atomization tower Perform heat exchange, cooling and solidification to generate nano-sized titanium alloy powder, which can usually produce 10-100 nm-sized nano powder.
[0020]
[0021] Examples of series of ultra-fine/nano powder materials that can be prepared by plasma atomization:
[0022]
[0023] The products produced by the technology and equipment involved in the present invention include but are not limited to the products exemplified above.
[0024]
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Description & Claims & Application Information

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