Method for depositing paint-coat of metal surface, especially for gradient paint-coat

A metal surface and cladding technology, applied in the direction of metal material coating process, coating, etc., can solve the problem that the plasma cladding process has not been reported yet, and achieves small deformation of the substrate, high production efficiency, and high powder utilization rate. Effect

Inactive Publication Date: 2003-03-26
山东科技大学机械电子工程学院
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods of cladding ceramics on metal surfaces are mainly laser cladding and electron beam cladding, while the plasma cladding process has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 70g of FeCrSiB powder with a particle size of 140-320 mesh, 30g of TiC powder with a particle size of 4μm, mix evenly with cellulose acetate acetone solution, apply the prepared coating on the Q235 substrate with a thickness of 3mm, and bake at 200°C Dry. Use arc plasma to scan the metal surface continuously at room temperature. The single-track scan width is 10mm, the working current is 180A, the working voltage is 25 volts, Ar is used as the protective and ionized gas, and the protective gas flow rate is 8m. 3 / h, ionized gas flow rate is 0.8m 3 / h, the distance between the nozzle and the workpiece is 8mm, and the scanning speed is 250mm / min. The sample is taken perpendicular to the scanning direction as a metallographic sample, and the 0.5mm thin slice is cut along the direction parallel to the metal surface, and the transmission electron microscope sample is prepared by mechanical thinning and ion thinning. The test results are as follows: the thickness of t...

example 2

[0023] Weigh 50g of FeCrSiB powder and 50g of WC powder, mix them evenly, make a paste with polyacrylic resin, and evenly coat it on the surface of Q235 steel, and then use a plasma scanning device to scan the sprayed layer to obtain a cladding layer that is metallurgically bonded to the substrate . The single-channel scanning width is 8mm, the working current is 200A, the working current is 35 volts, argon is used as the ionization and shielding gas, and the shielding gas flow rate is 10m 3 / h, ionized gas flow rate is 1m 3 / h, the distance between the nozzle and the workpiece is 10mm, and the scanning speed is 300mm / min. Cut samples along the direction perpendicular to the scanning direction for hardness, metallographic and electronic probe tests. The test results are as follows: the thickness of the cladding layer is 2.5mm, the cladding layer is composed of fine dendrites, cell dendrites and WC ceramic particles, and the microhardness can reach 0.05HV1300.

example 3

[0025] Weigh 50g of NiCrSiB powder and 50g of TiC powder, and spray it on the surface of 45 steel by arc spraying method to form a pre-coated coating with a thickness of 3mm. Scan the metal surface coated with the coating with argon plasma flow. The process parameters used are: the length of the plasma torch nozzle The size in the radial direction is 5mm, the length in the short diameter direction is 3mm, the distance between the plasma torch and the workpiece is 7mm, a transfer arc is formed between the plasma torch and the steel plate, the working current is 220A, the working voltage is 28 volts, Ar is used as the ionization and protective gas, and the protective gas flow rate 9m 3 / h, ionized gas flow rate 1.0m 3 / h, the scanning speed is 200mm / min. On the above-mentioned treated Q235 steel plate, the sample is cut along the direction perpendicular to the scanning direction to make a metallographic sample for metallographic structure observation, image analyzer quantitativ...

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Abstract

The invention refers to a method of melting-covering coating of metal surface, especially a method of gradient coating. The steps: 1, pre-smear the mixing pwoder of Fe-, Co- or Ni-group alloying powder and ceramic powder; 2, use plasm produced by ionizing non-oxidizing gas in plasm moment to scan metal surface in order to produce melting-covering layer or gradient cost. It has positive effects.

Description

1. Technical field [0001] The invention relates to a method for metal surface cladding coating, especially a gradient coating, which belongs to the field of metal heat treatment. 2. Background technology [0002] Materials are one of the three pillars of modern civilization, and the failure forms of mechanical engineering materials in modern industry are mainly corrosion, wear and fracture. Compared with developed countries in the world, there is a big gap in the variety and performance of materials in our country. According to incomplete statistics, only in the five departments of metallurgy, mining, agricultural machinery, electric power and construction, the number of parts that need to be scrapped or replaced due to wear and tear each year reaches More than 1 million tons, equivalent to more than 2 billion yuan, the enhanced anti-corrosion treatment of the surface of metal parts is an effective way to save materials, improve the life and reliability of parts, reduce cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 吴玉萍
Owner 山东科技大学机械电子工程学院
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