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Method for enhancing blade surface of metal hydraulic turbine runner by combining electrical sparkle deposition and plasma cladding

A technology of plasma cladding and electric spark deposition, applied in metal material coating process, fusion spraying, coating, etc., can solve the problems of high cost of wear-resistant materials, poor mechanical strength, insufficient strength, etc., and achieve wear resistance Good corrosion resistance, long service life and large coating thickness

Inactive Publication Date: 2014-06-04
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

The laser surface quenching and hardening layer is thin, the equipment investment is large, and the maintenance cost is high; the surface welding wear-resistant material is high in cost, slow in work efficiency, and there are also problems in surface processing; surface thermal spraying pretreatment generally uses sandblasting, which causes environmental pollution , the coating is difficult to process, the combination between the coating and the substrate is a mechanical combination, the bonding strength between the coating and the substrate is not enough, and the coating is prone to fatigue and peeling off when it is impacted; The hardness and hardness are also very high, but the EDM coating is very thin, and it is not easy to cover the area where the turbine is severely worn; the combination of the epoxy emery coating and the substrate is also a mechanical combination, and it is easy to fall off in the strong cavitation area; polyurethane elastic coating The combination of the layer and the substrate is also a mechanical combination. Although the abrasion resistance of the polyurethane elastic coating is good, its mechanical strength is poor and it is easy to be scratched. Once it is partially scratched, the adjacent area will be torn

Method used

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  • Method for enhancing blade surface of metal hydraulic turbine runner by combining electrical sparkle deposition and plasma cladding
  • Method for enhancing blade surface of metal hydraulic turbine runner by combining electrical sparkle deposition and plasma cladding

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Experimental program
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Effect test

Embodiment 1

[0016] The present invention is realized by the following methods in concrete implementation:

[0017] (1) Prepare iron-nickel alloy powder, which is calculated by weight percentage: Ni 30.5%, Cr 28%, C 1.5%, Mo 4%, B 1.5%, Si 4%, W 6% and Fe 24.5 %composition;

[0018] (2) Iron-nickel alloy powder layer cladding is carried out on the surface of the turbine runner with plasma cladding wear-resistant equipment, cladding input power supply voltage: 380V±10%, rated input capacity: 30KVA, output voltage: 75V, working voltage: 10~30V, output current: 300~600A, scanning speed: 200~500mm / min, powder feeder airflow: 0.65~0.75m 3 / h, ion gas flow rate: 0.65~0.75m 3 / h, protective gas flow rate: 0.65~0.75m 3 / h;

[0019] (3) Start the worktable operation of the plasma cladding wear-resistant equipment, move the plasma torch above the cladding part of the turbine runner blade, turn on the plasma torch protective gas argon and power supply to start the arc, and enter the plasma beam c...

Embodiment 2

[0023] When the described iron-nickel alloy powder is specifically implemented, it can also be calculated by weight percentage: Ni 30.5%, Cr 30%, C 1%, Mo 4.5%, B 1%, Si 5%, W 5.5%, and the balance is Fe powders, mixed together to form.

Embodiment 3

[0025] When the described iron-nickel alloy powder is specifically implemented, it can also be calculated by weight percentage: Ni 32%, Cr 26%, C 2%, Mo 3%, B 1%, Si 5%, W 8%, and the balance is Fe powders, mixed together to form.

[0026] Through experiments and tests of the present invention, a large number of nano-amorphous and microcrystalline particles appear in the coating, resulting in high density of the coating; the high temperature of 16000 ° C in plasma cladding and 24500 ° C in EDM makes the composite coating and the substrate produce metallurgical bonding The surface hardness of the coating can reach 1688.6HV~1891.3HV, while the hardness of the substrate is 331.2HV, and the hardness can be increased by 4-6 times; the wear resistance of the composite coating can be increased by 3-5 times than that of the substrate. Compared with the prior art, it has the following outstanding beneficial technical effects:

[0027] 1. The present invention adopts the metal water tu...

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Abstract

The invention relates to a method for enhancing blade surface of a metal hydraulic turbine runner by combining electrical sparkle deposition and plasma cladding. The method can be used for effectively solving the problems of poor surface hardness, wear resistance, corrosion resistance, shock resistance and the like of a blade of the hydraulic turbine runner and prolonging of the service life of the metal hydraulic turbine runner. The method comprises the following steps: cladding the blade surface of the hydraulic turbine runner with alloy powder by using inoxidizability plasma beams so as to form an alloy coating, and then depositing WC (Wolfram Carbide) ceramic hard alloy by using electrical sparkles on the basis of the plasma cladding coating so as to form an electrical sparkle deposition and plasma cladding combined composite coating. The method is simple and practicable; the formed electrical sparkle deposition and plasma cladding combined composite coating is firmly bonded with a matrix and is large in thickness; a bade is high in hardness, good in compactness and wear-resisting property and long in service life; the composite coating gives play to the advantages of low cost, good wear-resistant anti-corrosion performance, high hardness and strength and excellent wear resistance of iron-nickel alloy.

Description

technical field [0001] The invention relates to a hydraulic power generation machine, in particular to a method for enhancing the surface of a runner blade of a metal water turbine by using electric spark deposition combined with plasma cladding. Background technique [0002] Water turbine is an important equipment commonly used in hydropower generation. Hydropower generation is one of the important sources of electric energy. In particular, my country is a country rich in hydropower resources in the world. Hydropower has become one of the renewable energy sources that my country focuses on. Hydropower can be developed. The capacity is 380 million kw, and the annual power generation capacity is 1.9 trillion kw.h, which is equivalent to the power generation capacity of 1.1 billion tons of raw coal. One of the characteristics of my country's rivers is the high sediment content. There are 115 rivers with an average annual sediment discharge of more than 10 million tons, and the ...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C26/02C22C30/00C23C24/10
Inventor 王建升卢海霞李刚阎镇威唐明奇冯在强李勇
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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