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Copper-coated chromium composite powder and preparation method and application thereof

A technology of composite powder and copper cladding, which is applied in the direction of liquid chemical plating, coating, metal material coating process, etc., can solve the problems of short product life, poor dispersion, poor adhesion, etc., and achieve low production cost and high performance Effects of stability and purity improvement

Inactive Publication Date: 2014-06-25
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

How to creatively apply the technical principle of metal-coated composite powder to the preparation of copper-chromium alloy contact materials to solve the problems of poor dispersion, poor adhesion, and short product life in the preparation of copper-chromium alloy contact materials by powder metallurgy , this is not only a new topic faced by those skilled in the art, but also has very important significance for the application of copper-chromium alloy contact materials

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  • Copper-coated chromium composite powder and preparation method and application thereof
  • Copper-coated chromium composite powder and preparation method and application thereof
  • Copper-coated chromium composite powder and preparation method and application thereof

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preparation example Construction

[0039] A preparation method of the above-mentioned copper-coated chromium composite powder, comprising the following steps:

[0040] 1. Pretreatment:

[0041] The chromium powder is used as raw material, and the chromium powder is firstly pretreated; the pretreatment includes the steps of alkali washing to remove grease, pickling to remove oxide film, sensitization treatment and activation treatment.

[0042] 1.1 Alkaline cleaning and degreasing: use NaOH solution with a concentration of 2.2mol / L to 2.8mol / L to soak the raw chromium powder for 3min to 5min, and stir it at the same time during the soaking process, and constantly replenish NaOH according to the change of pH value during the soaking treatment The solution keeps the pH value in the range of 8-9 during the soaking process, and after the soaking is completed, it is washed with water and then enters the next step.

[0043] 1.2 Pickling to remove oxide film: use dilute H with a concentration of 0.5mol / L to 1.0mol / L ...

Embodiment 1

[0056] A copper-coated chromium composite powder of the present invention, comprising an inner core and an outer cladding layer, the inner core is mainly composed of irregular particles of chromium powder, and the particle size of a single irregular particle is between 30 μm and 70 μm , the outer cladding layer is mainly a continuous Cu metal layer.

[0057] A preparation method of the copper-coated chromium composite powder of the above-mentioned present embodiment, comprising the following steps:

[0058] 1. Pretreatment:

[0059] The chromium powder is used as raw material, and the chromium powder is firstly pretreated; the pretreatment includes the steps of alkali washing to remove grease, pickling to remove oxide film, sensitization treatment and activation treatment.

[0060] 1.1 Alkaline cleaning and degreasing: use NaOH solution with a concentration of 2.5mol / L to soak the raw material chromium powder for 4 minutes, and stir it at the same time during the soaking proc...

Embodiment 2

[0076] a kind of like image 3 , Figure 4 The copper-coated chromium composite powder of the present invention includes an inner core and an outer cladding layer, the inner core is mainly composed of irregular particles of chromium powder, and the particle size of a single irregular particle is between 30 μm and 70 μm , the outer cladding layer is mainly a continuous Cu metal layer.

[0077] A preparation method of the copper-coated chromium composite powder of the above-mentioned present embodiment, comprising the following steps:

[0078] 1. Pretreatment:

[0079] The chromium powder is used as raw material, and the chromium powder is firstly pretreated; the pretreatment includes the steps of alkali washing to remove grease, pickling to remove oxide film, sensitization treatment and activation treatment.

[0080]1.1 Alkaline cleaning and degreasing: Use 300mL NaOH solution with a concentration of 1.2mol / L to soak the raw material chromium powder (116g) for 5 minutes, sti...

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Abstract

The invention discloses copper-coated chromium composite powder which comprises an inner core and an outer coating layer. The inner core is mainly irregular particles formed by chromium powder, the diameter of each particle is smaller than 75 microns, and the outer coating layer is mainly a continuous Cu metal layer. A preparation method of the copper-coated chromium composite powder comprises the steps that chromium powder is pretreated; electroless copper plating is conducted on the outer surface of the chromium powder, an electroless plating solution is composed of soluble copper salt, a complexing agent, strong base, a reducing agent, potassium ferrocyanide and an addition agent, the power of hydrogen and the steam pocket of the electroless plating solution are monitored in real time in the electroless copper plating process, and main components in the electroless plating solution are continuously supplemented according to changes; surface passivating treatment is conducted on the composite powder, and the copper-coated chromium composite powder is obtained. The copper-coated chromium composite powder obtained through the preparation method can be used as technological production raw materials when copper-chrome alloy contactor materials are prepared through the powder metallurgy method, and copper-chrome alloy contactors obtained after the copper-coated chromium composite powder is used are few in segregation phenomenon, simple in technology and stable in performance.

Description

technical field [0001] The invention relates to a metal powder material and its preparation method and application, in particular to a chromium-containing composite metal powder material and its preparation method and application. Background technique [0002] Copper-chromium alloy contact materials are widely used in the preparation of resistance electrodes, contact materials, integrated circuit lead frames, electric train overhead wires, electric Products requiring high conductivity and high strength, such as steering gears of tools, rotor wires of large high-speed turbine generators, electrical switches and motor collector rings, especially copper-chromium alloys with high chromium content are especially displayed in high-power vacuum high-voltage switches. unique advantages. So far, no new contact material with better performance than high-chromium copper-chromium alloy has been found in the application of high-power vacuum switches. [0003] Because the mutual solubil...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F1/00C23C18/38
Inventor 陈刚吴旭升朱健斌涂川俊
Owner HUNAN UNIV
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