Copper aluminum/nickel plumbago composite powder material and production method

A composite powder, copper-aluminum-nickel technology, applied in the field of thermal spraying materials, can solve the problems of easily damaged abrasive parts, component deviation, high hardness of copper-aluminum/nickel graphite coating, etc., to achieve appropriate hardness, good manufacturability, and good grindability Effect of sealing properties

Active Publication Date: 2008-07-16
BEIJING GENERAL RES INST OF MINING & METALLURGY
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AI Technical Summary

Problems solved by technology

However, the preparation process of the copper-aluminum / nickel-graphite composite powder in the prior art is only simple physical and mechanical mixing, and there is a relatively large deviation in the composition during the spraying process, and the prepared copper-aluminum / nickel-graphite coating has a relatively high hardness, which is easy to damage the Abrasives

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  • Copper aluminum/nickel plumbago composite powder material and production method

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preparation example Construction

[0020] The preparation method of copper-aluminum / nickel-graphite composite powder material of the present invention, main steps are as follows:

[0021] (1) Add Cu to the agglomeration equipment for stirring, add binder during stirring, after the binder and copper powder are fully wetted, then add Al in proportion to continue stirring evenly, finally dry the powder, and sieve to obtain copper Aluminum alloy powder intermediate material. The copper and aluminum elements can be added in the form of pure metal or alloy powder. The copper-aluminum composite powder intermediate material is prepared by mechanical mixing and coating or by atomization. The morphology of copper-aluminum composite powder is shown in Fig. 2.

[0022] (2) Add Ni and C elements in the form of nickel-graphite composite powder in proportion, and fully stir with the binder to prepare the nickel-graphite powder intermediate material. It is also possible to mix the Ni and C composite powder with the binder, ...

Embodiment 1

[0026] (1) Add 11kg of copper powder into the agglomeration equipment for stirring, and add a binder when stirring. Add 2.5kg of binder (polyurethane and acetone are prepared according to the ratio of 1:2), after the binder and copper powder are fully wetted, add 850g of ultra-fine aluminum powder (with a particle size of 1-30μm), then stir evenly, and dry the powder Then sieve. Prepared copper-aluminum composite powder.

[0027] (2) The copper-aluminum composite powder and 7kg nickel-coated graphite composite powder (chemical composition: Ni: 58.6%, C: 40.8%) were mechanically stirred and mixed to obtain a copper-aluminum-nickel-graphite composite powder.

Embodiment 2

[0029] (1) Add 9kg of copper powder to the agglomeration equipment for stirring, and add 2kg of binder (the binder is a polyvinyl alcohol solution with a concentration of 10%) when stirring. After the binder and the copper powder are fully wetted, add 1 kg of ultra-fine aluminum powder (with a particle size of 1.5 μm), then stir evenly, and then sieve the powder after it is dried.

[0030] (2) Fully mix about 11kg of nickel-graphite composite powder (Ni: 80%, C: 20%) with the above-mentioned 0.5kg binder, and then add 240g of ultra-fine aluminum powder (with a particle size range of 1 to 30 μm), Stir well, dry the powder and sieve to prepare Al-Ni-Graphite.

[0031] (3) Fully mixing aluminum / nickel graphite and copper-aluminum composite powder to prepare copper-aluminum-nickel-graphite composite powder.

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Abstract

The invention provides a composite powder of copper, aluminum / nickel and graphite and a preparation method thereof. The composite comprises the constituents by weight: 20-40 percent of Ni, 40-60 percent of Cu, 4-10 percent of Al; the rest is C. The preparation method of the invention comprises the steps: first, intermediate material of copper and aluminum alloy powder is prepared; then intermediate materials of nickel graphite powder are made, and the copper, aluminum / nickel and graphite composite powder is prepared by mechanically mixing the intermediate material of copper and aluminum alloy powder with the nickel graphite powder. The copper, aluminum / nickel and graphite employed in the invention belong to the coating material of medium-temperature seal configuration. The powder has the advantages of good usability in coating processing, and the coating has superior binding strength and seal configuration performance; employing hot spraying technique to prepare the copper, aluminum / nickel and graphite coating has good wear resistance and sealing performance; if being applied to the compressor part of an engine, the invention can achieve excellent effect.

Description

【Technical field】 [0001] The invention relates to the technical field of thermal spraying materials, in particular to a copper-aluminum / nickel-graphite composite powder material and a preparation method thereof. 【Background technique】 [0002] With the development of aviation industry, higher and higher requirements are put forward for aero-engines. At present, the gas path sealing technology that reduces the gap between the compressor, turbine blade tip and casing has become the main method to improve engine performance. According to data reports, in a high-pressure turbine, every time the gap is reduced by 0.13-0.25mm, the fuel consumption can be reduced by 0.5-1.0%, and the efficiency of the engine can be increased by about 2%. During the operation and operation of the engine, it is actually impossible to control the gap to zero. Therefore, a gap of 2 to 3 mm should be reserved between the blade tip and the case when the aero-engine is designed and manufactured. Excessi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C1/04
Inventor 于月光曾克里许根国康瑜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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