Method for Manufacturing Nanostructured Powder by Wire Explosion in Liquid and Device for Manufacturing the Same

Abstract

The present invention relates to a method for manufacturing the nanostructured powder by a wire explosion in liquid and a device for manufacturing the same. To be more specific, the object of the invention is to provide a method for manufacturing the nanostructured powder by a wire explosion in liquid and a device for manufacturing the same, in which, a metal wire ( 18 ) is vaporized in liquid ( 14 ) by generating an electrical explosion using the same principle al in gas, with the characteristic of pulsed power, even though the liquid ( 14 ) with a low conductivity is used, and the nanostructured powder of a metal wire ( 18 ) is produced in the space made by the volume expansion of vaporized vapour, all of which was performed with an understanding that electrical explosion is not so different in principle weather in gas or in liquid. By achieving this object, the present invention can provide an advantage of natural disperse of the nanostructured powder into a liquid, hence either the agglomeration between powder particles or the surface oxidation of the nanostructured powder is not generated, as the powder is not in contact with oxygen in liquid. Moreover, the classification according to size becomes possible with the reduction of the number of processes, hence providing an advantage of an effective application of the nanostructured powder an the economic ripple effect thereto.

1 . A method for manufacturing nanostructured powder by a wire explosion in liquid, comprising: exploding a metal wire electrically using pulsed power in the chamber filled with a liquid (dispersing solvent) selected from the group consisting of oil, distilled water, insulating oil, solvent, acetone, ethanol and gasoline; vaporizing the metal wire in liquid; and concentrating or collecting the produced nanostructured powder. 
     
     
         2 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 1 , wherein the first process is progressed by including a step of providing the chamber filled with a liquid; a step of continuously feeding a metal wire into the liquid from an upper side of the chamber; and a step of flowing 0.1-100 kJ pulsed power into the metal wire in the liquid to generate an electrical explosion. 
     
     
         3 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 1 , wherein the second process includes a step of vaporizing the metal wire in liquid due to an electrical explosion; and a step of producing nanostructured powder of the metal wire in the space made by the volume expansion of vaporized vapour. 
     
     
         4 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 1 , wherein the third process includes a step of discharging the liquid dispersed (suspended) with nanostructured powder from the chamber; a step of uniformly injecting the discharged liquid into a collecting filter using a spray; and a step of picking up nanostructured powder filtered by the collecting filter. 
     
     
         5 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 1 , wherein the third process includes a step of discharging the liquid dispersed (suspended) with nanostructured powder from the chamber; and a step of evaporating the discharged liquid by an evaporation classification method to retrieve or concentrate nanostructured powder for pickup. 
     
     
         6 . (canceled) 
     
     
         7 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 4 , wherein a plurality of collecting filters having different sizes of mesh (hole diameter) are vertically arranged to collect nano-structured powder through classification according to size. 
     
     
         8 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 4 , wherein when nanostructured powder filtered by the collecting filter is picked up, it is picked up in a state that the nanostructured powder is covered with the liquid (dispersing solvent) to prevent an oxidation. 
     
     
         9 . The method for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 4 , wherein a step of reflowing the liquid passing through the collecting filter into the chamber is further progressed by a liquid circulating motor. 
     
     
         10 . A device for manufacturing nanostructured powder by a wire explosion in liquid, comprising: a chamber having a structure divided into an upper space and a lower space by an insulator; a liquid (dispersing solvent) selected from the group consisting of oil, distilled water, insulating oil, solvent, acetone ethanol and gasoline filled in the lower space; a wire feeding device as a configuration provided in the upper space, including a wire roll wound with a metal wire, a pair of feeding rollers for feeding the wire being unfolded from the wire roll into the lower space through a wire guide, and an electric motor connected with the wire roll and the rotational axis of a pair of the feeding rollers; a wire explosion device as a configuration provided in the lower space, including a high voltage electrode mounted on a bottom surface of the lower space in the chamber, a trigger switch connected with the high voltage electrode, a capacitor connected with the switch, a charging device for charging the capacitor with high voltage, a controller for sensing the rotation angle of the feeding motor to generate a trigger signal in the switch; a nanostructured powder collecting device as a configuration arranged for communicating with a bottom corner location of the lower space, including a cistern tank having a predetermined volume, a valve imbedded pipe connected for communicating the lower space of the chamber with an upper space of the cistern tank, a spray mounted integrally at the end of the pipe for being arranged in an upper end space of the cistern tank, and a number of collecting filters vertically mounted at equal intervals under the spray in the interior space of the cistern tank; and a recirculation device as a configuration for recirculating the liquid from the nanostructured powder collecting device to the lower space, including a circulation pipe connected for communicating between a lower end of the cistern tank and an upper end of the lower space in the chamber, an on-off valve mounted on the circulation pipe, and a liquid circulating pump. 
     
     
         11 . The device for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 10 , wherein a hollow wire guide for feeding the wire is mounted in the insulator of the chamber, and a grounding electrode is further mounted in the lower space filled with the liquid. 
     
     
         12 . The device for manufacturing nanostructured powder by a wire explosion in liquid according to  claim 10 , wherein among a number of the collecting filters, the filter with a large mesh size (hole diameter) is located at upper level, while the filter with a small mesh size is located at the lower level.