Method for preparing core-shell type copper-based alloy powder capable of resisting high-temperature oxidization

A high-temperature oxidation-resistant, copper-based alloy technology, applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problem that the high-temperature oxidation resistance of pure copper powder has not been significantly improved, and the chemical plating on the surface of pure copper powder Nickel failure, chemical nickel plating solution is easy to decompose and other problems, to achieve the effect of low production cost, convenient operation, and inhibition of high temperature oxidation

Inactive Publication Date: 2012-07-04
NANCHANG HANGKONG UNIVERSITY
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AI Technical Summary

Problems solved by technology

However, in the process of electroless nickel plating on the surface of pure copper powder, using hydrazine as a reducing agent, the temperature of the solution and the order of adding raw materials need to be strictly controlled, otherwise the electroless nickel plating solution is easy to decompose, resulting in electroless nickel plating on the surface of pure copper powder. fail
Obviously, the above two methods have problems such as complicated process, inconvenient operation, low efficiency, and the high temperature oxidation resistance of pure copper powder has not been significantly improved.
In addition, so far, in order to inhibit the high-temperature oxidation of copper-based alloy powders, there is no electroless plating of a layer of nickel on the surface of copper-based alloy powders, and then a layer of electroless plating of chromium to form a copper-based alloy with a core-shell structure. Literature reports on powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Use hydrochloric acid with a volume ratio of 50% to activate Cu-Sn alloy powder with a mass of 40 g and an average particle size of 40 μm. The activation time is 30 min. After activation, the Cu-Sn alloy powder is filtered and washed with deionized water to Neutral, then dry the Cu-Sn alloy powder in a vacuum constant temperature drying oven at a temperature of 120°C for 60 minutes;

[0016] (2) Add the activated Cu-Sn alloy powder to the electroless nickel plating solution accompanied by mechanical stirring for electroless nickel plating. The electroless nickel plating time is 30 minutes, then filter, wash with deionized water for 3 times, and then in The Cu—Sn alloy powder treated with electroless nickel plating was dried in a vacuum constant temperature drying oven at a temperature of 140° C. for 80 minutes. Among them, the formula of electroless nickel plating solution is: nickel sulfate 40g / L, sodium hypophosphite 45g / L, the pH value of the solution is adjusted...

Embodiment 2

[0021] (1) Use hydrochloric acid with a volume ratio of 50% to activate Cu-Al-Ni alloy powder with a mass of 60 g and an average particle size of 80 μm. The activation time is 50 min. After activation, the Cu-Al-Ni alloy powder is filtered and used Wash with deionized water until neutral, and then dry the Cu-Al-Ni alloy powder in a vacuum constant temperature drying oven at a temperature of 160°C for 90 minutes;

[0022] (2) Add the activated Cu-Al-Ni alloy powder to the electroless nickel plating solution accompanied by mechanical stirring for electroless nickel plating. The electroless nickel plating time is 45min, then filter and wash with deionized water for 3 times, Then, the electroless nickel-plated Cu-Al-Ni alloy powder was dried in a constant-temperature vacuum oven at a temperature of 180° C. for 100 min. Among them, the formula of electroless nickel plating solution is: nickel sulfate 70g / L, sodium hypophosphite 60g / L, the pH value of the solution is adjusted to 5.2...

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Abstract

The invention discloses a method for preparing core-shell type copper-based alloy powder capable of resisting high-temperature oxidization, which is characterized by including steps of: (1) performing activation, filtering, deionization washing and drying on the surface of copper-based alloy; (2) performing chemical nickel plating processing in a plating tank with prepared nickel plating solution, and performing filtering, deionization washing and drying after the chemical nickel plating is finished; (3) performing chemical chromeplating processing in a plating tank with prepared chromeplating solution, and performing filtering, deionization washing and drying after the chemical chromeplating processing. The method for preparing core-shell type copper-based alloy powder capable of resisting high-temperature oxidization has the advantages of being simple in process, convenient to operate, high in processing efficiency and low in production cost. Prepared copper-based alloy powder has a core-shell structure, starting oxidation temperature of the powder is improved by 400-700 DEG C compared with unprocessed copper-based alloy powder, high-temperature oxidization of the copper-based alloy can be effectively avoided, and the method has wide application prospect in the field for cladding high-strength high-conductivity copper-based alloy coatings in laser mode on surfaces of copper crucibles, electromagnetic gun guide rails, aluminum alloy, magnesium alloy and the like.

Description

technical field [0001] The invention relates to a method for preparing core-shell alloy powder by means of electroless plating, in particular to a preparation method for coating a layer of nickel on the surface of copper alloy powder and then coating a layer of chromium. Background technique [0002] Copper alloys, aluminum alloys and magnesium alloys have important application value and broad application prospects in the fields of metallurgy, automobiles, military equipment, and aerospace. However, during the service process of these alloys, the main failure mode is that the surface is prone to thermal cracks, wear and corrosion. Therefore, it is of great significance to improve the hardness, wear resistance and corrosion resistance of its surface to improve economic benefits and production efficiency. At present, laser cladding high-strength and high-conductivity copper-based alloy coating on the surface of the above alloy is an important way to improve the surface wear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/36C23C18/31
Inventor 周圣丰戴晓琴尧忠
Owner NANCHANG HANGKONG UNIVERSITY
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