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Preparation method of nickel-based wear-resistant coating for nuclear second-stage pump bearing

A wear-resistant coating, secondary pump technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problem that the plasma surfacing technology cannot meet the preparation requirements of the nuclear secondary pump bearing wear-resistant coating, etc. problems, to achieve the effect of low porosity, low flame temperature and extended service life

Inactive Publication Date: 2012-11-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a nickel-based wear-resistant coating for nuclear secondary pump bearings, which is used to solve the problem that plasma surfacing technology cannot meet the needs of nuclear secondary pump bearings. The technical problem of wear-resistant coating preparation requirements

Method used

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  • Preparation method of nickel-based wear-resistant coating for nuclear second-stage pump bearing
  • Preparation method of nickel-based wear-resistant coating for nuclear second-stage pump bearing
  • Preparation method of nickel-based wear-resistant coating for nuclear second-stage pump bearing

Examples

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Effect test

Embodiment 1

[0019] In this example, the preparation method of the nickel-based wear-resistant coating for nuclear secondary pump bearings, the specific parameters are as follows:

[0020] The composition of the spraying powder used is according to the weight percentage: Cr: 16wt%; Si: 3.5wt%; B: 3.0wt%; C: 0.7wt%;

[0021] Using supersonic flame spraying technology, the spray powder is sprayed on the substrate. The preparation process parameters are: oxygen pressure is 150psi; propane pressure is 90psi; compressed air pressure is 100psi; oxygen flow is 350SCFH; propane flow is 165SCFH; compressed air flow is 910SCFH; powder feeding rate is 30g / min; spraying distance is 270mm.

[0022] The appearance of the prepared nickel-based wear-resistant coating for nuclear secondary pump bearings was observed with a magnifying glass. The results showed that the coating was complete, the surface was uniform and continuous, and there were no cracks, peeling and edge warping.

[0023] The thickness of...

Embodiment 2

[0028] In this embodiment, the preparation method of the wear-resistant coating for the bearing of the nuclear secondary pump, the specific steps are as follows:

[0029] In this example, the preparation method of the nickel-based wear-resistant coating for nuclear secondary pump bearings, the specific parameters are as follows:

[0030] The composition of the spray powder used is according to the weight percentage: Cr: 16.8wt%; Si: 4.5wt%; B: 3.0wt%; C: 0.8wt%; Ni: the balance; where B represents boron, C represents carbon .

[0031] Using supersonic flame spraying technology, the spray powder is sprayed on the substrate. The preparation process parameters are: oxygen pressure is 150psi; propane pressure is 90psi; compressed air pressure is 100psi; oxygen flow is 350SCFH; propane flow is 165SCFH; compressed air flow is 890SCFH; powder feeding rate is 20g / min; spraying distance is 270mm.

[0032] The appearance of the prepared coating was observed with a magnifying glass, an...

Embodiment 3

[0038] In this embodiment, the preparation method of the wear-resistant coating for the bearing of the nuclear secondary pump, the specific steps are as follows:

[0039] In this example, the preparation method of the nickel-based wear-resistant coating for nuclear secondary pump bearings, the specific parameters are as follows:

[0040] The composition of the spraying powder used is according to the weight percentage: Cr: 15wt%; Si: 5.0wt%; B: 3.5wt%; C: 0.9wt%;

[0041] Using supersonic flame spraying technology, the spray powder is sprayed on the substrate. The preparation process parameters are: oxygen pressure is 160psi; propane pressure is 100psi; compressed air pressure is 110psi; oxygen flow rate is 370SCFH; propane flow rate is 180SCFH; 910SCFH; powder feeding rate is 20g / min; spraying distance is 250mm.

[0042] The appearance of the prepared coating was observed with a magnifying glass, and the results showed that the coating was complete, the surface was uniform a...

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Abstract

The invention relates to the field of preparation of wear-resistant coatings, in particular to a preparation method of a nickel-based wear-resistant coating for a nuclear second-stage pump bearing, which solves the problem of difficulties in preparation of bearing wear-resistant coatings for a nuclear environment. The nickel-based wear-resistant coating for the nuclear second-stage pump bearing is prepared by spraying powder onto a matrix through a supersonic flame spraying technology. According to process parameters, the pressure of oxygen is 140 to 160psi; the pressure of propane is 80 to 100psi; the pressure of compressed air is 95 to 110psi; the flow of the oxygen is 340 to 370 standard cubic foot per hour (SCFH); the flow of the propane is 150 to 180SCFH; the flow of the compressed air is 880 to 920SCFH; powder feeding amount is 20 to 30g / min; and a spraying distance is 250 to 290mm. The wear-resistant coating prepared by the method is suitable for the nuclear second-stage pump bearing and has important application value.

Description

technical field [0001] The invention relates to the field of preparation of wear-resistant coatings, in particular to a method for preparing nickel-based wear-resistant coatings for nuclear secondary pump bearings. Background technique [0002] The nuclear secondary pump is specially designed equipment to ensure the safety and reliability of nuclear power plants. It is a high-end technology product. and completely get rid of foreign technology blockade. Bearings, one of the core components of nuclear secondary pumps, work under the complex and severe conditions of nuclear radiation, high temperature, heavy load, heavy wear and erosion, and long service life, so surface protection measures must be taken for them. Wear-resistant coating can play an important role in effectively reducing friction and wear, prolonging service life, and improving operation stability and efficiency. It is a key technology in the manufacture of nuclear secondary pumps. Foreign countries attach gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129
Inventor 张甲常新春侯万良徐娜张凤军张春智栾胜家王建强全明秀
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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