Novel technology for continuously producing nano powder by using ultra-high temperature plasma and preparation process thereof

Abstract

The invention discloses novel technology for continuously producing nano powder by using ultra-high temperature plasma and a preparation process thereof. The technology is implemented by a device consisting of an electrical control system, a vacuum pumping and measuring system, an gas charging system, an ultra-high temperature plasma heating, evaporating and pulverizing system, a high air-flow cooling and circulating system, a water cooling and circulating system, a nano powder supplementing and collecting system, a powder cleaning system and a vacuum packaging and storing system. High vacuum is adopted in the embodiment of the invention and the method comprises the following steps of: directly heating metal powder by using the ultra-high temperature plasma to form metal vapor quickly; and colliding the metal vapor quickly with high air-flow gas molecules to make the metal vapor loose energy and form clusters by using the high air-flow cooling and circulating system and water cooling circulation, and condensing the clusters into the nano metal powder. Metal hydride nano powder, metal nitride nano powder, metal oxide nano powder and pure metal nano powder can be produced by using different protective gases. Compared with the prior art, the nano metal powder produced by the method has the advantages of difficult agglomeration, simple process, high purity, convenient operation and maintenance, low production cost, easy realization of large-scale industrial production and wide popularization.

Description

technical field [0001] The present invention relates to a new technology for continuous production of nano-powder by using ultra-high temperature plasma and its preparation process for continuous production: nano-pure metal powder, nano-metal hydride powder, nano-metal nitride powder, and nano-metal oxide powder The preparation technology is specifically a process and equipment for the industrial production of nanometer metal powder. Background technique [0002] Nanopowder refers to ultrafine particles with an average particle size below 100nm. Due to its small size, small number of atoms in the particle, and many atoms distributed on the surface, its surface area effect, volume effect and small size effect make it have different properties from conventional bulk and micropowder materials. It has many new and extremely important application values ​​in the fields of aviation, aerospace, military industry, materials, metallurgy, chemical industry, medicine, etc., and is kno...

AI Technical Summary

Problems solved by technology

However, this equipment has the disadvantages of low utilization rate of plasma energy, large air volume gas charging system and medium frequency induction heating system cannot exert the due 100% efficiency

The plasma system of CN100457339C patent only utilizes the medium-frequency induction heating system in the high-temperature plasma evaporation patented equipment to exist in the metal liquid in the water-cooled crucible after being liquefied at a high temperature by the medium-frequency heating system. Heat conduction and a large amount of heat conduction of the water-cooled crucible lead to a low utilization rate of high-temperature heat of the plasma, and only a small amount of metal vapor can be formed. The gas filling system of the CN100457339C equipment is used to continuously produce nano-metal powders with a very low output, so that the patented equipment The large air volume inflation system cannot exert 100% efficiency, CN100457339C patent equipment has repeated heating, low energy utilization, low yield, high production cost, and complicated equipment

[0005] Based on the above analysis, it can be found that the current domestic production and research equipment patents have not completely solved the problems of high quality, high yield, high cost, etc.

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