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KR-102960961-B1 - Metal powder manufacturing apparatus and metal powder manufacturing method using same

KR102960961B1KR 102960961 B1KR102960961 B1KR 102960961B1KR-102960961-B1

Abstract

The present invention aims to solve the problem of metal vapor solidifying on the wall of a cooling section during the manufacture of metal powder by the vapor phase condensation method. According to one embodiment of the present invention, a method is provided in which a carrier gas for transporting metal vapor is utilized as a cooling gas to cool the outer wall of a chamber that melts and vaporizes metal raw materials. According to the present invention, as a portion of the carrier gas cools the wall of the chamber as a cooling gas, the temperature of the molten metal in which the metal raw materials are melted decreases, and as a result, the metal vapor pressure in the molten metal decreases, thereby suppressing rapid metal evaporation in the molten metal. In addition, while cooling the outer wall of the chamber, the temperature of the carrier gas rises, and the carrier gas heated to a certain level is introduced into the chamber. Therefore, by adjusting the proportion of the portion of the carrier gas utilized as a cooling gas, the temperature of the carrier gas introduced into the chamber can be appropriately controlled.

Inventors

  • 양승민
  • 정영규
  • 권오형

Assignees

  • 한국생산기술연구원

Dates

Publication Date
20260507
Application Date
20220111

Claims (10)

  1. A chamber that accommodates metal raw materials inside; A plasma torch that generates metal vapor using plasma from the metal raw material within the chamber; A first carrier gas inlet for introducing a first carrier gas into the chamber; and A cooling section comprising: a section in which the metal vapor conveyed to the first carrier gas is received and the metal vapor is cooled by a quenching gas to form metal powder; and A second carrier gas flows along the outer wall of the chamber, cooling the outer wall of the chamber, and The first carrier gas inlet above includes an inlet into which the second carrier gas is introduced, and The second carrier gas introduced through the inlet is combined with the first carrier gas and introduced into the chamber as a total carrier gas. The temperature of the total carrier gas introduced into the chamber is controlled by adjusting the flow rate ratio of the first carrier gas and the second carrier gas. Metal powder manufacturing device.
  2. In Article 1, As the outer wall of the chamber is cooled by the second carrier gas, the metal vapor pressure of the metal vapor generated from the metal raw material is reduced, thereby preventing solidification in the cooling section caused by an increase in the metal vapor pressure. Metal powder manufacturing device.
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  4. In Article 1, The temperature of the second carrier gas rises as it cools the outer wall of the chamber, thereby raising the temperature of the entire carrier gas. Metal powder manufacturing device.
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  6. In Article 1, The above metal raw material comprises any one of nickel, copper, silver, iron, aluminum, cobalt, platinum, gold, tin, and alloys containing the same. Metal powder manufacturing device.
  7. Step of loading metal raw materials into a chamber in a solid state; A step of forming metal vapor using plasma with the above metal raw material; A step of transferring the metal vapor from the chamber toward the cooling section by a first carrier gas; and The method includes the step of cooling the metal vapor with quenching gas in the cooling section to solidify it into a powder form, and A second carrier gas flows along the outer wall of the chamber, cooling the outer wall of the chamber, and The second carrier gas that cools the outer wall of the chamber is introduced while being preheated through an inlet formed on one side of the carrier gas inlet into which the first carrier gas is introduced, and combines with the first carrier gas to form the total carrier gas. As the outer wall of the chamber is cooled by the second carrier gas, the metal vapor pressure of the metal vapor generated from the metal raw material is reduced, thereby preventing solidification in the cooling section caused by an increase in the metal vapor pressure. The temperature of the entire carrier gas is controlled by adjusting the flow rate ratio of the first carrier gas and the second carrier gas. Method for manufacturing metal powder.
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Description

Metal powder manufacturing apparatus and metal powder manufacturing method using same The present invention relates to a metal powder manufacturing apparatus and a method for manufacturing metal powder using the same, and more specifically, to an apparatus for manufacturing metal powder through the vaporization and condensation of metal raw materials and a method for manufacturing metal powder using the same. Methods for manufacturing metal powders are classified into wet and dry methods. Wet methods utilize chemical reactions in a liquid phase and include precipitation, sol-gel, and hydrothermal synthesis. Dry methods utilize raw materials in the gas phase and include chemical vapor synthesis and gas vapor condensation. Dry methods have the advantage of high purity and excellent crystallinity. However, since it is a high-temperature process, there is a problem in that the generated metal powders collide with each other and undergo localized sintering at the collision points, forming bonded particles where the powders stick together. Since these bonded particles must be selectively removed during the subsequent classification process, this classification leads to a problem of low yield during powder manufacturing. Gas-phase condensation, a type of dry method, is a process for manufacturing metal powder by heating metal raw materials to a high temperature to vaporize them, and then cooling and condensing them in a cooling section. A metal powder forming device using the gas-phase condensation method melts and vaporizes the metal raw materials using plasma, then transports the vaporized metal vapor to a cooling pipe using a carrier gas, where it is cooled to solidify the metal vapor into metal powder. If the particle size of the metal powder formed by the gas-phase condensation method is non-uniform, this is attributed to factors such as uneven energy supply of the plasma, flow caused by the carrier gas, boiling of the molten metal, and changes in the specific surface area of the metal raw materials. Furthermore, during the transport process, the vaporized metal vapor may solidify and become fixed on the walls of the cooling pipe. Such solidification on the walls of the cooling pipe results in a loss of metal powder, adversely affects fluid flow, and can also be a source of impurity particles. Therefore, it is necessary to suppress this phenomenon. FIG. 1 is a schematic diagram illustrating a metal powder manufacturing apparatus by a vapor phase condensation method according to the technical concept of the present invention. FIG. 2 is a schematic diagram illustrating a conventional metal powder manufacturing apparatus. Figure 3 is a diagram showing the molten metal temperature distribution in a conventional manufacturing apparatus (left side of Figure 3) and the molten metal temperature distribution in a manufacturing apparatus according to the present invention (right side of Figure 3). Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments of the present invention are provided to more completely explain the technical concept of the present invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the technical concept of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to make the present disclosure more faithful and complete and to fully convey the technical concept of the present invention to those skilled in the art. In this specification, the same reference numerals denote the same elements throughout. Furthermore, various elements and areas in the drawings are depicted schematically. Accordingly, the technical concept of the present invention is not limited by the relative sizes or spacing depicted in the attached drawings. FIG. 1 illustrates a metal powder manufacturing apparatus (100) by a vapor condensation method according to the technical concept of the present invention. Referring to FIG. 1, the metal powder manufacturing apparatus (100) includes a chamber (112) that contains a metal raw material (110) inside, and a plasma torch (116) that generates metal vapor by using plasma within the chamber (112) to vaporize the metal raw material (110). It also includes a cooling section (120) in which metal vapors, each transported by a carrier gas, are received, and the metal vapors are cooled by a quenching gas to form metal powder (126). The metal raw material (110) is loaded into the chamber (112) in a solid state. Inside the chamber (112), it is heated to a high temperature by plasma, melted, and then vaporized into metal vapor. The metal raw material (110) may be introduced in the form of powder or pellets. The metal raw material (110) may include any one of nickel, copper, silver, iron, aluminum, cobalt, platinum, gold, tin, and alloys containing these. The vaporized metal vapor is tr