Composite injection device for manufacturing ultrafine metallic powder

Abstract

An objective of the present disclosure is to provide an injection device that can manufacture spherical and defect-minimized powder. In accordance with the objective, the present disclosure provides an EIGA-type composite injection device that can inject both of gas and water. That is, the composite injection device of the present disclosure manufactures amorphous spherical powder by forming fine spherical pre-powder by injecting high-temperature gas at high pressure to a stream of liquid metal melted through an injector coil and then by inject water immediately before the pre-powder solidifies.

What is claimed is: 
     
         1 . A composite injection device for manufacturing ultrafine metallic powder, the composite injection device comprising:
 a metal melter configured to heat and melt a metal bar by surrounding the metal bar with an induction coil and configured to continuously supply the metal bar without an orifice;   a first injector disposed under the metal melter; and   a second injector disposed under the first injector at a distance at which the molten metal drops by predicting time for which a melting point of the molten metal is reached,   wherein the first injector and the second injector are configured in a variable type such that heights thereof can be adjusted in accordance with the melting point of the molten metal, and the higher the melting point of the molten metal, the larger the disposition gap corresponding to a height difference of the first injector and the second injector is adjusted;   injection of the second injector is performed before a melting point of a molten metal film is reached;   the metal bar includes high melting-point metal having a melting point of 1500° C. or more or a highly reactive material;   the first injector injects high-temperature gas;   the second injector injects water, or coolant gas, or a mixture of water and coolant gas, thereby manufacturing spherical amorphous fine powder;   a stream of the molten metal is dispersed in a film shape by primarily injecting high-temperature gas at 300 to 400° C. at gas pressure of 60 to 100 bar to the molten metal through the first injector and spherical fine powder with less defects is formed by increasing a cooling rate of the molten metal and increasing impulse; and   spherical fine power is manufactured in an amorphous type by changing the cooling rate to be high by secondarily injecting water or coolant gas at −20° C. to room temperature or a mixture of water and coolant gas at −20° C. to room temperature through the second injector before the molten metal film solidifies.   
     
     
         2 . The composite injection device of  claim 1 , wherein pressure of water that is injected from the second injector is 100 to 1000 bar. 
     
     
         3 . The composite injection device of  claim 1 , wherein when coolant gas is injected from the second injector, pressure of the coolant gas is 20 to 200 bar. 
     
     
         4 . The composite injection device of  claim 1 , wherein as the temperature of gas becomes high, the gas is supplied at low supply amount and pressure from the first injector. 
     
     
         5 . A composite injection device for manufacturing ultrafine metallic powder, the composite injection device comprising:
 a metal melter configured to heat and melt a metal bar by surrounding the metal bar with an induction coil and configured to continuously supply the metal bar without an orifice;   a first injector disposed under the metal melter; and   a second injector disposed close to the firs injector,   wherein the first injector and the second injector are operated with a time difference by operating the second injector later than the first injector, the higher the melting point of molten metal, the longer the time difference of the operation time of the first injector and the second injector is adjusted, and the higher the melting point of the molten metal, the longer the time for which the molten metal is exposed to gas injection from the first injector is made, and then the molten metal is exposed to injection from the second injector;   the metal bar includes high melting-point metal having a melting point of 1,600° C. or more or a highly reactive material;   the first injector injects high-temperature gas;   the second injector injects water, or coolant gas, or a mixture of water and coolant gas, thereby manufacturing spherical amorphous fine powder;   a stream of the molten metal is widely dispersed in a film shape by primarily injecting high-temperature gas at 300 to 400° C. at gas pressure of 60 to 100 bar to the molten metal through the first injector and spherical fine powder with less defects is formed by increasing a cooling rate of the molten metal and increasing impulse; and   spherical fine power is manufactured in an amorphous type by changing the cooling rate to be high by secondarily injecting water or coolant gas at −20° C. to room temperature or a mixture of water and coolant gas at −20° C. to room temperature through the second injector before the molten metal film solidifies.   
     
     
         6 . A device for manufacturing metallic powder, the device comprising:
 a chamber;   an induction coil disposed in the chamber and configured to melt a metal bar;   a guide having a hole through which molten metal melted by the induction coil passes, and configured to guide the molten metal;   a gas injector disposed at the guide and configured to inject gas at 300° C. or more toward the molten metal that has passed through the hole; and   a water injector configured to inject water at room temperature or less at a downstream side further than the gas injector in a flow direction of the molten metal,   wherein amorphous spherical metallic powder is manufactured after the molten metal passes through the gas injector and the water injector; and   some of gas that is supplied to the gas injector is diverted and supplied to the molten metal flowing from the induction coil to the guide.   
     
     
         7 . The device of  claim 6 , wherein some of gas that is supplied to the gas injector is diverted, passes through a pressure relief valve, and is then supplied to the molten metal flowing from the induction coil to the guide. 
     
     
         8 . The device of  claim 6 , further comprising:
 a heater configured to heat gas to temperature of 300° C. or more; and   a pressurizer configured to pressurize the gas heated through the heater to 60 bar or more,   wherein the gas pressurized by the pressurizer is supplied to the gas injector, and   some of the gas heated by the heater is diverted and supplied to the molten metal flowing from the induction coil to the guide.   
     
     
         9 . The device of  claim 8 , wherein temperature of gas that is injected from the gas injector is 300° C. to 400° C. and pressure of the gas is 60 bar to 100 bar. 
     
     
         10 . The device of  claim 6 , wherein temperature of water that is injected from the water injector is 5° C. or less and pressure of the water is 100 bar to 1000 bar, and
 a coolant is mixed in the water that is injected from the water injector. 
 
     
     
         11 . The device of  claim 6 , further comprising a gas barrier installed in the chamber to at least surround molten metal flowing from the induction coil to the guide,
 wherein some of gas that is supplied to the gas injector is diverted and supplied into the gas barrier.   
     
     
         12 . The device of  claim 11 , wherein the gas that is supplied into the gas barrier is supplied at an angle in a flow direction of the molten metal. 
     
     
         13 . The device of  claim 11 , wherein an anti-outflow portion is formed at an end of the gas barrier to prevent gas from flowing out of the gas barrier in an opposite direction to a flow direction of the molten metal. 
     
     
         14 . The device of  claim 11 , further comprising a separation plate installed in the chamber to divide the chamber into a first chamber in which the induction coil is disposed and a second chamber in which the gas injector is disposed, and having a hole through which the molten metal passes,
 wherein the gas barrier is installed on the separation plate.   
     
     
         15 . The device of  claim 6 , further comprising a separation plate installed in the chamber to divide the chamber into a first chamber in which the induction coil is disposed and a second chamber in which the gas injector is disposed, and having a hole through which the molten metal passes,
 wherein some of gas that is supplied to the gas injector is diverted and supplied into the first chamber, and   pressure of the first chamber is higher than pressure of the second chamber.   
     
     
         16 . The device of  claim 6 , wherein the water injector can be moved in the flow direction of the molten metal.