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Preparation method of corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundle

A technology of amorphous coating and boiler tube bundle, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of not being able to apply large-scale structural materials, and achieve good bonding, high activity, and uniform structure Effect

Inactive Publication Date: 2016-06-15
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice, amorphous materials have not been widely used. The main reason is that the shape of amorphous materials (strip, wire and powder) limits its application as a large-scale structural material.

Method used

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  • Preparation method of corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundle
  • Preparation method of corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundle
  • Preparation method of corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundle

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The method for preparing the corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundles in this embodiment comprises the following steps:

[0028] Step 1. Prepare molybdenum-based amorphous alloy powder by aerosol method. The molybdenum-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Fe7.5%, Cr15.0%, Ni5.0%, Si6. 5%, Al1.5%, C4.6%, W1.5%, Y0.2%, the balance is Mo and unavoidable impurities; the particle size of the molybdenum-based amorphous alloy powder is 50 μm;

[0029] Step 2, using a plasma spraying process to prepare a corrosion-resistant and wear-resistant molybdenum-based amorphous coating on the surface of the boiler tube bundle. The process parameters of the plasma spraying process are: arc voltage 63V, arc current 475A, argon flow is 20L / min, the hydrogen flow rate is 7L / min, the spray gun moving speed is 65mm / s, and the spraying distance is 100mm; the thickness of the mol...

Embodiment 2

[0038] The method for preparing the corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundles in this embodiment comprises the following steps:

[0039] Step 1. Prepare molybdenum-based amorphous alloy powder by aerosol method. The molybdenum-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Fe10.5%, Cr18.6%, Ni8.5%, Si7. 44%, Al0.8%, C6.98%, W4.5%, Y1.2%, the balance is Mo and unavoidable impurities; the particle size of the molybdenum-based amorphous alloy powder is 60 μm;

[0040] Step 2: Prepare a corrosion-resistant and wear-resistant molybdenum-based amorphous coating on the surface of the boiler tube bundle by using a plasma spraying process. The process parameters of the plasma spraying process are: arc voltage 62V, arc current 450A, argon gas flow rate is 20L / min, the hydrogen flow rate is 6L / min, the spray gun moving speed is 65mm / s, and the spraying distance is 100mm; the thicknes...

Embodiment 3

[0043] The method for preparing the corrosion-resistant and wear-resistant molybdenum-based amorphous coating for boiler tube bundles in this embodiment comprises the following steps:

[0044] Step 1. Prepare molybdenum-based amorphous alloy powder by aerosol method. The molybdenum-based amorphous alloy powder is made by mixing the following raw materials in weight percentage: Fe9.0%, Cr16.8%, Ni6.75%, Si6. 97%, Al1.15%, C5.79%, W3.0%, Y0.7%, the balance is Mo and unavoidable impurities; the particle size of the molybdenum-based amorphous alloy powder is 40 μm;

[0045] Step 2, using a plasma spraying process to prepare a corrosion-resistant and wear-resistant molybdenum-based amorphous coating on the surface of the boiler tube bundle. The process parameters of the plasma spraying process are: arc voltage 70V, arc current 550A, argon flow is 25L / min, the hydrogen flow rate is 8L / min, the spray gun moving speed is 80mm / s, and the spraying distance is 110mm; the thickness of the...

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Abstract

The invention discloses a preparation method of a corrosion-resistant and wear-resistant molybdenum-based amorphous coating for a boiler tube bundle. The method comprises the following steps: firstly, preparing molybdenum-based amorphous alloy powder by adopting an aerosol method, wherein the molybdenum-based amorphous alloy powder is formed by mixing the following raw materials in percentage by mass: 7.0-11.0% of Fe, 11.0-20.0% of Cr, 1.0-10.0% of Ni, 6.0-9.0% of Si, 0.5-2.0% of Al, 2.6-8.0% of C, 0.5-5.5% of W, 0-2% of Y and the balance of Mo and unavoidable impurities; secondly, preparing and obtaining the corrosion-resistant and wear-resistant molybdenum-based amorphous coating on the surface of the boiler tube bundle by adopting a plasma spraying technology. The molybdenum-based amorphous coating prepared by the invention has excellent corrosion resistance, wear resistance and high-temperature stability, and can protect the heat erosion surface of the boiler tube bundle better in an environment with the combined effect of heat corrosion and erosion, so that the service life of the boiler tube bundle is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying treatment, in particular to a method for preparing a corrosion-resistant and wear-resistant molybdenum-based amorphous coating by thermal spraying. Background technique [0002] Corrosion of the heating surface of boilers in coal-fired power plants is common. Water-cooled wall tubes, superheaters, reheaters and other high-temperature heating surfaces often fail due to high-temperature oxidation and corrosion. In recent years, with the development of boilers with large capacity and high parameters, the corrosion phenomenon has become more obvious, which has seriously affected the safe operation of power plants. With the continuous development and improvement of thermal spraying technology and the expansion of application fields, the superiority of anti-corrosion and wear resistance of thermal spraying coatings is more and more widely used in boiler pipe protection. Thermal spraying metal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC22C45/10
Inventor 陈永楠姜超平高振韩建军鲁元郝建民陈宏
Owner CHANGAN UNIV
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