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High-strength and high-wear-resistance composite brazing coating for repairing water turbine blade

A technology of brazing coating and repairing water, which is applied in the field of repairing coatings on the surface of water turbine blades, can solve problems such as low bonding strength, difficult thickness, and complicated procedures, and achieve the goals of increasing surface hardness, improving wear resistance, and good compatibility Effect

Active Publication Date: 2021-11-19
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A Chinese patent has been published: an automatic surfacing device for repairing guide vanes of hydraulic turbines (201811650242.X), which improves welding efficiency and solves the problems of high labor intensity for manual surfacing repairs and difficulty in ensuring surfacing quality
A method for repairing cracks in hydraulic turbine blades (201510549734.X), using X-detection and laser beam methods to repair blade cracks, but the process is relatively complicated
The on-line laser strengthening device for turbine blades (201910205181.4) overcomes the problems of large heat-affected zone of base materials, low bonding strength, difficult control of thickness, unenvironmental protection, large operating space, and low repair efficiency during the traditional arc welding defect repair process of turbine blades.
However, the above-mentioned blade repair device lacks the monitoring of the profile information of the repair layer and the interlayer temperature, and the thickness of the repair layer cannot be accurately controlled, and the goal of real-time optimization of process parameters cannot be achieved.

Method used

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  • High-strength and high-wear-resistance composite brazing coating for repairing water turbine blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-strength and high-wear-resistant composite braze coating for repairing turbine blades, which is made by mixing low-melting-point brazing filler metal with a weight percentage of 9:1 and high-melting-point cemented carbide, and then coating and heating. The low-melting-point brazing filler metal It is a mixture of iron-based solder, copper-based solder, and nickel-based solder. The high-melting-point cemented carbide is a mixture of carbide and boride.

[0022] According to the weight percentage, the iron-based solder is a mixture of 55% iron powder, 25% titanium-iron powder, 5% molybdenum powder, 5% chromium powder, and 10% iron carbide. The melting temperature is 1030-1155 ° C; the copper-based solder is copper 79 %, nickel 12%, manganese 6%, rare earth praseodymium 3%, melting temperature 955 ~ 1045 ℃; nickel-based solder is nickel 81.5%, chromium 9.5%, boron 3%, yttrium 1%, iron 5% Mixed powdered solder, melting temperature 965 ~ 1130 ℃;

[0023] The carbide ...

Embodiment 2

[0035]A high-strength and high-wear-resistant composite braze coating for repairing turbine blades, which is made by mixing low-melting-point brazing filler metal and high-melting-point cemented carbide with a weight percentage of 1:1, and then coating and heating. The low-melting-point brazing filler metal It is a mixture of iron-based solder, copper-based solder, and nickel-based solder. The high-melting-point cemented carbide is a mixture of carbide and boride.

[0036] According to the percentage by weight, the iron-based solder is a mixture of 55% iron powder, 25% iron carbide, 5% molybdenum boride, 5% chromium powder, and 10% iron boride. The melting temperature is 1030-1145°C; the copper-based solder is copper 79%, nickel 12%, manganese 6%, rare earth yttrium 3% mixed solder, melting temperature 955 ~ 1040 ℃; nickel-based solder is nickel 81.5%, chromium 9.5%, boron 3%, yttrium 1%, iron 5% % mixed powdered solder, melting temperature 965 ~ 1130 ℃;

[0037] The carbide ...

Embodiment 3

[0042] A high-strength and high-wear-resistant composite braze coating for repairing turbine blades, which is made by mixing low-melting-point brazing filler metal with a weight percentage of 5:1 and high-melting-point cemented carbide, and then coating and heating. The low-melting-point brazing filler metal It is a mixture of iron-based solder, copper-based solder, and nickel-based solder. The high-melting-point cemented carbide is a mixture of carbide and boride.

[0043] According to the percentage by weight, the iron-based solder is 55% of iron powder, 25% of titanium-iron powder, 5% of molybdenum powder, 5% of chromium powder, and 10% of iron carbide, and the melting temperature is 1030-1155°C; the copper-based solder is 79% of copper, Mixed solder with 12% nickel, 6% manganese, and 3% rare earth praseodymium, melting temperature 955-1045°C; nickel-based solder is a mixture of 81.5% nickel, 9.5% chromium, 3% boron, 1% yttrium, and 5% iron Powdered solder, melting temperat...

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Abstract

The invention relates to a high-strength and high-wear-resistance composite brazing coating for repairing a water turbine blade. The high-strength and high-wear-resistance composite brazing coating is prepared by mixing low-melting-point brazing filler metal and high-melting-point hard alloy according to the weight percentage ratio of (1-9): 1, coating and heating, the low-melting-point brazing filler metal is a mixture of any two or three of iron-based brazing filler metal, copper-based brazing filler metal and nickel-based brazing filler metal, and the high-melting-point hard alloy is a mixture of carbide and boride. According to the high-strength and high-wear-resistance composite brazing coating, the organic mixed iron-based, copper-based and nickel-based low-melting-point brazing filler metal and the carbide, boride and diamond high-melting-point hardening materials have the unique advantages of high strength, high hardness, high wear resistance, high corrosion resistance and the like, the wear resistance is improved by 37.2%-51.9% compared with that of a base body, the corrosion resistance of the composite brazing coating is improved by 2-3.5 orders of magnitude, and the bonding strength of the coating and the base body is improved by 0.56-1.18 times, and the defects of air holes, corrosion, cracks, abrasion and the like of hydraulic machinery in overflowing and sediment environments can be effectively overcome.

Description

technical field [0001] The invention relates to the technical field of repair coatings on the surface of water turbine blades, in particular to a high-strength and high wear-resistant composite braze coating for repairing water turbine blades. Background technique [0002] Due to the long-term wear and cavitation of the river and sediment, the turbine blades will produce fatigue cracks and sediment corrosion defects. It needs to be repaired regularly (about one year) on site to improve the working efficiency of the turbine. The repair of turbine blades often adopts surfacing welding, cladding, arc welding and other methods. However, due to the lack of professional repair methods when repairing the blades, only relying on traditional methods to repair the surface defects has low work efficiency and low bonding strength, which is not in line with the reality of energy saving, emission reduction, and environmental protection in modern manufacturing There is an urgent need to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C9/06C22C19/05C22C26/00C22C32/00C22C38/22C22C38/28
CPCC23C24/103C22C9/06C22C19/057C22C26/00C22C38/22C22C38/28
Inventor 王星星李帅胡素梦方乃文杜全斌杨晓红温国栋彭进倪增磊崔大田李彬
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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