Copper-chromium alloy powder continuous producing method

A copper-chromium alloy and atomization powder-making technology, which is applied in the field of alloy preparation, can solve problems such as poor fluidity, easy blockage of flow channels, nozzles, and poor density, so as to avoid blockage of flow channels, improve filtration efficiency, and reduce passing pressure. Effect

Active Publication Date: 2019-02-19
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the traditional graphite crucible is used as the copper-chromium alloy carrier, and there is a danger of chromium and carbon reacting to form impurities; continuous production cannot be realized; there is a density difference between the two phases of copper and chromium, and the melting process must be stirred, otherwise it will be extremely dangerous. It is easy to cause uneven composition; copper-chromium alloy has fast heat dissipation and poor fluidity, and it is easy to block the flow channel and nozzle; when the chromium content is between 0.7% and 40%, if the cooling is slow, the two phases will separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for continuously producing copper-chromium alloy powder, comprising the following steps:

[0019] (1) Vacuum induction smelting: material composition and weight percentage: 0.7% chromium, copper balance, the vacuum induction smelting part of the vacuum air atomization powder making equipment, arranged with multiple induction heating units, each unit is equipped with a piece of ceramics Crucible, respectively put the required materials into the ceramic crucible, start the vacuum pumping system, wait until the vacuum degree reaches 10 -1 Pa, heating with medium-frequency electromagnetic induction with gradient increasing power. In the first stage, the control power is 800Hz, and heat treatment is carried out for 10 minutes. In the second stage, the control power is 1200Hz, and heat treatment is carried out for 15 minutes. The power is 1800Hz, and the heat treatment is carried out for 30 minutes, so that the gas in the raw material is further released. When the te...

Embodiment 2

[0023] A method for continuously producing copper-chromium alloy powder, comprising the following steps:

[0024] (1) Vacuum induction smelting: material composition and weight percentage: 30% chromium, copper balance, the vacuum induction smelting part of the vacuum air atomization powder making equipment is equipped with multiple induction heating units, and each unit is equipped with a piece of ceramics Crucible, respectively put the required materials into the ceramic crucible, start the vacuum pumping system, wait until the vacuum degree reaches 10 -2Pa, heating with medium-frequency electromagnetic induction with gradient increasing power. In the first stage, the control power is at 900Hz, and the heating treatment is carried out for 15 minutes. The power is 1900Hz, heat treatment for 33 minutes, so that the gas in the raw material is further released, when the temperature of the raw material in the ceramic crucible reaches 1100°C, turn off the vacuum pumping system, and...

Embodiment 3

[0028] A method for continuously producing copper-chromium alloy powder, comprising the following steps:

[0029] (1) Vacuum induction melting: material composition and weight percentage: chromium 40%, copper balance, vacuum induction melting part of vacuum air atomization powder making equipment, arranged with multiple induction heating units, each unit is equipped with a piece of ceramics Crucible, respectively put the required materials into the ceramic crucible, start the vacuum pumping system, wait until the vacuum degree reaches 10 -3 Pa, heating with medium-frequency electromagnetic induction with gradient increasing power. In the first stage, control the power at 1000Hz for 20 minutes of heat treatment. In the second stage, control the power at 1400Hz for 25 minutes of heat treatment and heat preservation for 18 minutes. In the third stage, control The power is 2000Hz, heat treatment for 35min, so that the gas in the raw material is further released, when the temperatu...

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Abstract

The invention discloses a copper-chromium alloy powder continuous producing method. The copper-chromium alloy powder continuous producing method comprises the following steps that (1) 0.7-40% of chromium by the weight ratio and the balance copper are charged into a ceramic crucible to be melted and stirred through electromagnetic induction; (2) metal liquid is atomized and broken into a lot of fine liquid drops, induction heating is conducted on a flow guide nozzle, the molten liquid flows out from the flow guide nozzle at the bottom of the ceramic crucible, and the atomization powder making process is repeated; and (3) the fine liquid drops are solidified into spherical and sub-spherical particles in the flying process and then screened into metal powder with various particle sizes. According to the copper-chromium alloy powder continuous producing method, heating melting is conducted through electromagnetic induction, electromagnetic induction stirring is adopted, rapid gas atomization is adopted, thus, copper-chromium alloy forms the small liquid drops and is quickly cooled, and the situation that copper is separated from chromium at the solid state is avoided.

Description

technical field [0001] The invention belongs to the technical field of alloy preparation, and in particular relates to a method for continuously producing copper-chromium alloy powder. Background technique [0002] Vacuum electromagnetic induction smelting: It is a technology to make the material with better magnetic sensitivity obtain induced current through the principle of electromagnetic induction to achieve the purpose of heating. The current passes through the electromagnetic coil around the metal material at a certain frequency, and the changing current generates an induced magnetic field, which causes an induced current to be generated inside the metal, and generates a large amount of heat to heat the material. In this process, since the whole process takes place in a vacuum environment, it is conducive to the removal of gas impurities inside the metal, and the obtained metal alloy material is more pure. During the melting process, due to the characteristics of indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08C22C9/00
CPCB22F9/082B22F2009/0836B22F2009/0844B22F2009/0848B22F2009/0888B22F2009/0896C22C9/00
Inventor 张石松刘凯王小军李鹏王文斌李刚师晓云赵俊
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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