Laser cladding high-temperature protective coating surface polishing and purifying method based on pulsed electron beam technology

A technology of pulsed electron beams and protective coatings, which is applied in coatings, metal material coating processes, etc., can solve problems such as short pulse width, workpiece deformation, surface defects, etc., achieve high energy utilization, avoid coating oxidation, The effect of improving wear resistance

Pending Publication Date: 2019-12-20
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing MCrAlY high temperature protective coating is processed to remove the surface oxide layer and improve the roughness, and the surface treatment is usually carried out by mechanical processing technology, which will easily lead to workpiece deformation, stress concentration and surface defects. The surface polishing and purification method of laser cladding high temperature protective coating with pulsed electron beam technology, that is, using pulsed electron beam technology instead of machining, using the technical characteristics of pulsed electron beam low energy, short pulse width, and high bombardment times to directly remove the surface of the cladding layer Oxide skin, eliminate processing defects, and further eliminate defects such as voids and dendrite segregation on the surface of the laser cladding layer, refine the surface grains of the cladding layer, and improve the high temperature protection performance of the cladding layer surface

Method used

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  • Laser cladding high-temperature protective coating surface polishing and purifying method based on pulsed electron beam technology
  • Laser cladding high-temperature protective coating surface polishing and purifying method based on pulsed electron beam technology
  • Laser cladding high-temperature protective coating surface polishing and purifying method based on pulsed electron beam technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Grinding and polishing the surface of the superalloy substrate, and cleaning it ultrasonically with acetone and alcohol;

[0025] (2) Prepare NiCrAlY high-temperature protective coating on the surface of the substrate by coaxial powder-feeding laser cladding technology, select according to the technical requirements of laser cladding equipment: spot diameter 3mm, laser power 1.0KW, scanning speed 10mm / s, lap joint Rate 20%, argon protection;

[0026] (3) Use pulsed electron beam technology to directly irradiate the NiCrAlY cladding layer, select according to the technical requirements of pulsed electron beam equipment: vacuum degree P≤8×10 -3 Pa, the energy density is 4J / cm 2 , pulse width 1.5μs, bombardment times 30 times

[0027] Using a scanning electron microscope to observe the surface morphology of the coating before and after pulsed electron beam irradiation treatment, there is a very thick layer of oxide skin on the original coating surface, and the surfac...

Embodiment 2

[0029] (1) Grinding and polishing the surface of the superalloy substrate, and cleaning it ultrasonically with acetone and alcohol;

[0030] (2) Prepare NiCoCrAlY high-temperature protective coating on the substrate surface by coaxial powder-feeding laser cladding technology, select according to the technical requirements of laser cladding equipment: spot diameter 3mm, laser power 1.3 kW, scanning speed 15mm / s, Receiving rate 35%, argon protection;

[0031] (3) Use pulsed electron beam technology to irradiate the NiCoCrAlY cladding layer, select according to the technical requirements of pulsed electron beam equipment: vacuum degree P≤8×10 -3 Pa, the energy density is 4J / cm 2 , pulse width 1.5μs, bombardment times 45 times

[0032] Scanning electron microscopy was used to observe the surface morphology of the coating before and after pulsed electron beam irradiation treatment, such as figure 1 As shown, there is a very thick layer of oxide skin on the surface of the laser c...

Embodiment 3

[0034] (1) Grinding and polishing the surface of the superalloy substrate, and cleaning it ultrasonically with acetone and alcohol;

[0035](2) CoNiCrAlY high-temperature protective coating was prepared on the surface of the substrate by coaxial powder-feeding laser cladding technology, selected according to the technical requirements of laser cladding equipment: spot diameter 3mm, laser power 2 kW, scanning speed 20mm / s, lap joint 50% rate,

[0036] (3) Use pulsed electron beam technology to irradiate CoNiCrAlY cladding layer, select according to the technical requirements of pulsed electron beam equipment: vacuum degree P≤8×10 -3 Pa, the energy density is 8J / cm 2 , pulse width 1.5 μs, bombardment times 60 times

[0037] Scanning electron microscopy was used to observe the surface morphology of the coating before and after pulsed electron beam irradiation treatment. The surface oxide scale of the laser cladding CoNiCrAlY protective coating is thicker, and the surface perfor...

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Abstract

The invention provides a laser cladding high-temperature protective coating surface polishing and purifying method based on a pulsed electron beam technology. The laser cladding high-temperature protective coating surface polishing and purifying method is characterized in that the pulsed electron beam technology is utilized to replace mechanical machining, pulsed electron beam polishing and purifying treatment is performed on a high-temperature protective coating prepared on the high-temperature alloy matrix surface by utilizing a laser cladding technology to remove a cladding layer surface oxide skin, machining defects are eliminated, and the laser cladding layer surface impurity, gap and dendritic segregation defects are further eliminated, cladding layer surface grains are refined, thepolished, purified and refined coating surface is obtained, and the cladding layer surface roughness is effectively reduced and the cladding layer high-temperature protective performance is improved.By means of the laser cladding high-temperature protective coating surface polishing and purifying method based on the pulsed electron beam technology, cladding layer surface grain ultrafining even nanoscale refining can be further realized, abundant deformation structures are generated, and then the cladding layer surface abrasive resistance, oxidation resistance and corrosion resistance are effectively improved.

Description

technical field [0001] The invention relates to a surface treatment technology, in particular to a high-energy beam surface modification technology on the surface of a laser cladding layer, in particular to a method for polishing and purifying the surface of a laser cladding high-temperature protective coating based on pulsed electron beam technology. Background technique [0002] MCrAlY high temperature protective coating is currently an indispensable thermal protection material for various gas turbine engines because of its excellent resistance to high temperature oxidation and hot corrosion, and its composition can be selected according to different working conditions. The laser cladding technology under the protection of inert gas shows unique advantages in the preparation of metal coatings with dense and fine structure, low dilution rate, and metallurgical combination with the substrate. Laser surface cladding technology refers to the use of high-energy-density laser be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F4/04C23C24/10
CPCC23C24/106C23F4/04
Inventor 蔡杰高承钻李晨吕鹏关庆丰李玉新
Owner JIANGSU UNIV
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