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A kind of preparation method of high-strength wear-resistant copper-nickel-tin alloy coating

A nickel-tin alloy, wear-resistant copper technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem that alloy materials cannot be used in large-scale industrial production, the coating effect is not ideal, and the preparation steps are complicated. and other problems, to achieve the effect of improving energy utilization, saving material costs, and simple process

Active Publication Date: 2019-12-31
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of Cu-Ni-Sn alloys and their wires, strips, and rods, as well as the preparation of copper alloy coatings such as CuAl, CuNi, and CuNiIn by thermal spraying, have been reported and applied, but these methods have waste of raw materials and preparation steps. Complexity, high cost, low production efficiency or unsatisfactory coating effect, so that Cu-Ni-Sn alloy materials cannot be used in large-scale industrial production

Method used

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  • A kind of preparation method of high-strength wear-resistant copper-nickel-tin alloy coating
  • A kind of preparation method of high-strength wear-resistant copper-nickel-tin alloy coating
  • A kind of preparation method of high-strength wear-resistant copper-nickel-tin alloy coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a high-strength wear-resistant copper-nickel-tin alloy coating is carried out as follows:

[0035] (1) Cu15Ni8SnNb alloy powder is prepared by gas atomization; in the Cu15Ni8SnNb alloy, the weight percentages of each component are: nickel 15%, tin 8%, niobium 1%, and the balance is copper;

[0036] (2) Weigh 300 g of Cu15Ni8SnNb alloy powder prepared by gas atomization; sieve Cu15Ni8SnNb alloy powder with a particle size of 23-75 μm; the corresponding mesh number is 200-400 mesh; the purpose of sieving the alloy powder is After controlling the particle size range, it is actually controlled that the alloy powder can be melted evenly during thermal spraying to facilitate thermal spraying. Therefore, it is necessary to sieve out the large particles and too fine powder. At the same time, the alloy powder is preferably spherical. Powder, under the flame blowing, its trajectory is stable, and the mass distribution of individual particles is uniform, wh...

Embodiment 2

[0047] The difference between this example and Example 1 is that the thermal spraying method adopted in step 6 is oxyacetylene flame spraying, the flame generated gas is oxygen 4 bar, acetylene 0.7 bar, the spraying distance is 180 mm, and the gun translation speed is 300 mm / s, translation distance 3 mm, repeated spraying 5 times, powder feeding speed 25 g / min, and finally obtained a thickness of about 300 μm and a hardness of about 250 HV 0.1 coating.

[0048] In the ball-on-disk friction and wear test, under the same friction test conditions, the wear rate of the sprayed Cu15Ni8SnNb coating was 3.54×10 -3 mm 3 / N m, higher than 2.85×10 of the alloy bulk -3 mm 3 / N·m.

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 is that the thermal spraying method adopted in step 6 is subsonic flame spraying, and the flame generated gas is oxygen and acetylene. After adjusting the flow rate of acetylene to about 0.8 bar, increase the flow rate of oxygen to make the combustion The flame flow turns into a white oxidizing flame, and at the same time, 1.2 bar compressed air is introduced to cool the spray gun and accelerate the flame injection speed. The spraying distance is 200 mm, the gun translation speed is 300 mm / s, the translation distance is 3 mm, the powder feeding speed is 30 g / min, and the spraying is repeated 5 times, and finally the thickness is about 300 μm and the hardness is about 300 HV. 0.1 coating.

[0051] In the ball-on-disk friction and wear test, under the same friction test conditions, the wear rate of the sprayed Cu15Ni8SnNb coating was 1.85×10 -3 mm 3 / N m, lower than 2.85×10 of alloy bulk -3 mm 3 / N·m.

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Abstract

The invention discloses a preparation method of a high-strength wear-resistant copper-nickel-tin alloy coating in the technical field of metal materials, which firstly adopts a gas atomization method to prepare Cu-Ni-Sn-Nb alloy powder; then thermally sprays the alloy powder On the surface of the substrate provided with the nickel-clad aluminum primer layer, after aging treatment, a high-strength wear-resistant copper-nickel-tin alloy coating attached to the surface of the substrate is obtained. The invention can be used for surface strengthening of guide rails, bearings, bearing bushes, etc. used in high-strength and harsh environments. On the basis of ensuring the excellent performance of Cu-Ni-Sn alloy on the surface of the base material, it greatly saves raw materials, shortens the production cycle, and improves production. The obtained alloy coating has the advantages of high strength and good wear resistance.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a preparation method of a high-strength wear-resistant copper-nickel-tin alloy coating. Background technique [0002] Copper-nickel-tin alloy (such as Cu15Ni8Sn) as a strip decomposition strengthened alloy has strong toughness, excellent wear resistance and corrosion resistance, and its performance under high load, high speed and acidic environment is better than that of beryllium copper. and aluminum bronze. Spraying a layer of Cu-Ni-Sn coating on the surface of the substrate by thermal spraying technology also has the excellent performance of the alloy. Therefore, the development of this coating has broad application prospects in protecting or repairing parts. [0003] Thermal spraying is an important surface enhancement technology. It uses some heat source such as electric arc, combustion flame, plasma, etc. to heat the sprayed material to a molten or semi-molten stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/08C22C9/06C23C4/123C23C4/18C23C4/02
CPCC22C9/06C23C4/02C23C4/08C23C4/18
Inventor 肖金坤刘黎明张超李大玉张伟
Owner YANGZHOU UNIV
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