Method for preparing ceramic-metal composite material cladding layer

A metal composite material and cladding layer technology, which is applied in metal material coating process, coating, molten spraying, etc., can solve the problems of low bonding strength and high porosity, and achieve small heat-affected zone and arc column stability Good results

Inactive Publication Date: 2008-05-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing cladding layer of ceramic-metal composite material, which solves the problems of low bonding strength and high porosity in the coating prepared by thermal spraying method.

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  • Method for preparing ceramic-metal composite material cladding layer
  • Method for preparing ceramic-metal composite material cladding layer
  • Method for preparing ceramic-metal composite material cladding layer

Examples

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example 1

[0024] Example 1: Prepare a cladding layer with a thickness of 1000 μm (the thickness of the remelted layer is 1030-1100 μm). The metal substrate is an A3 steel plate with a thickness of 6mm. The powder core wire material for spraying is: the average mass fraction of composite powder (57%FeB+40%CrB+3%Si) in the powder core wire is 40%, and the powder core wire sheath is Fe. The steel plate was degreased and pretreated by sand blasting, and a coating with an average thickness of 1000 μm was prepared on the surface of the steel plate by arc spraying. The micro-beam plasma arc remelting parameters are: the diameter of the plasma arc gun compression nozzle is 1mm, the ion gas flow rate is 0.1L (liter) / min, the shielding gas flow rate is 2L (liter) / min; the plasma arc current is 40A. The distance between the head of the micro-beam plasma arc torch and the surface of the coating is 4mm, the relative movement speed between the micro-beam plasma arc torch and the workpiece is 4mm / s, ...

example 2

[0026] Example 2: Prepare a cladding layer with a thickness of 300 μm (the thickness of the remelted layer is 350-400 μm), and its working temperature is 800° C. The metal substrate is 0Cr19Ni9 steel pipe with an outer diameter of 31mm and a thickness of 3mm. Spraying powder core wire material is: composite powder (50%CrB+35%Cr 3 C 2The average mass fraction of +12TiC+3%Si) in the powder core wire is 35%, and the powder core wire sheath is 0Cr18Ni9Ti. The steel pipe is pretreated by degreasing and sand blasting, and a coating with a thickness of 300 μm is prepared on the outer surface of the steel pipe by arc spraying. When remelting, the micro-beam plasma arc gun is fixed. Use the additional mechanical movement device to make the pipeline perform spiral movement. The pipeline movement parameters are: the axial movement speed is 7.5mm / min, and the pipeline speed is 4round / min. The micro-beam plasma arc remelting parameters are: the diameter of the plasma arc gun compressio...

example 3

[0027] Example 3: Prepare a cladding layer with a thickness of 3 mm (the thickness of the remelted layer is 3.05-3.15 mm). The metal substrate is a 12CrMoV steel plate with a thickness of 20mm. The material of the sprayed core wire is: the average mass fraction of the composite powder (45% FeB+55% CrB) in the core wire is 42%, and the core wire sheath is Fe. The specific process is divided into the following three steps: (1) degreasing and sandblasting the steel plate, and using arc spraying to prepare a coating with an average thickness of 1000 μm on the surface of the steel plate. The micro-beam plasma arc remelting parameters are: the diameter of the plasma arc gun compression nozzle is 1mm, the ion gas flow rate is 0.15L (liter) / min, the shielding gas flow rate is 2.3L (liter) / min; the plasma arc current is 40A, the micro-beam plasma The distance between the arc torch head and the coating surface is 4mm, the relative movement speed between the plasma arc torch and the wor...

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Abstract

Provided is a process for preparing a cladding layer of ceramic-metallic composite material, belonging to the technical field of superficial treatment. The technique includes that the surface of a metallic member is cleaned, unoiled and sprayed sand, enabling the surface of the metallic member to be roughened, then the method of electric arc spraying or plasma spraying is employed to prepare the coating layer of ceramic-metallic composite material on the surface of the metallic member, the scanning remelting of the coating layer is carried out by utilizing a plasma arc gun with micro beam and the like. The parameters of the invention include that a compression nozzle of the plasma arc gun with the diameter of 0.6 to 1.3 millimeters is chosen, the ionized gas flow is 0.08 to 0.2 liter every minute, the protective gas flow is two to three liters every minute, the plasma arc current is 10 to 30A when the thickness of the coating layer is less than 600 micrometers, the plasma arc current is 25 to 60A when the thickness of the coating layer is 600 to 1500 micrometers, the distance between the head portion of the plasma arc gun with micro beam and the surface of the coating layer is two to five millimeters, and the relative move speed of the plasma arc gun with micro beam to the member is two to eight millimeters every second. The invention has the advantages of simple technique, stable quality, low cost and high manufacture efficiency.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular provides a method for preparing a cladding layer of a ceramic-metal composite material. It is suitable for preparing wear-resistant and high-temperature corrosion-resistant cladding layers with metallurgical bonding on the surface of metal components, especially the outer surface of steel pipes used in the four tubes of thermal power plant boilers. Background technique [0002] The wear resistance and high temperature corrosion resistance of metal components can be improved by preparing alloy and ceramic-metal composite coatings on the surface of metal components. Currently, existing technologies include thermal spraying, cold spraying, and vapor deposition. The main problems of vapor deposition technology are: slow deposition rate, thin coating, generally only a few to tens of microns of coating can be obtained; it is difficult to prepare coatings on the surface of la...

Claims

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Application Information

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IPC IPC(8): C23C4/04C23C4/12C23C4/10C23C4/06C23C4/131C23C4/134C23C4/18
Inventor 刘宗德侯世香钟颖虹
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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