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Method and device for preparing coating by using nanosecond pulse laser cladding

A nanosecond pulsed laser and coating technology, applied in coating, metal material coating process, gaseous chemical plating, etc., can solve problems such as affecting the surface quality of the cladding layer, shrinking the film into molten droplets, and discontinuous heat conduction. , to achieve the effect of shortening the production cycle, good film quality and simplifying the processing process

Inactive Publication Date: 2014-06-11
SICHUAN INST OF MATERIALS & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to use nanosecond pulse laser to clad the surface of carbon steel and stainless steel against Zhang Anfeng, etc., and the intense photothermal interaction between the powder and the surface of the substrate will blow off part of the pre-coated powder and produce a large number of small particles. and ripples, which seriously affect the surface quality of the cladding layer, and the cladding effect is poor. However, Zhang Yongbin et al. pre-deposited a certain thickness of metal film on the surface of the workpiece by magnetron sputtering, and then cladding it with laser, the interface between the film and the substrate will form Interface thermal resistance, interface thermal resistance will cause discontinuity of heat conduction, and the problem of film shrinkage into melt drops or film peeling occurs. A method and device for preparing coatings by nanosecond pulse laser cladding are provided

Method used

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  • Method and device for preparing coating by using nanosecond pulse laser cladding

Examples

Experimental program
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Effect test

Embodiment 1

[0057] 1. Preparation before cladding. Open the vacuum chamber and place the aluminum workpiece on the sample stage, close the quartz vacuum chamber, and turn on the vacuum pump to evacuate the quartz vacuum chamber until the vacuum degree reaches the order of 1Pa.

[0058] 2. Heating the workpiece. Turn on the induction heating coil to heat the workpiece until the temperature displayed by the thermocouple reaches 165°C, and maintain a constant temperature.

[0059] 3. Laser cleaning the surface of the workpiece. Turn on the laser scanning system to clean the surface of the workpiece by nanosecond pulse laser sputtering, the energy density of the nanosecond pulse laser is 1000 mJ / cm 2 , the overlap rate is 30%, and then turn off the laser scanning system.

[0060] 4. Laser cladding. Open the valve, let the argon enter the nickel carbonyl source tank through the mass flow meter, load the carbonyl nickel into the quartz vacuum chamber, adjust the flow rate of the argon, and ...

Embodiment 2

[0063] 1. Preparation before cladding. Open the vacuum chamber, place the uranium workpiece on the sample stage, close the vacuum chamber, turn on the vacuum pump, and evacuate the vacuum chamber until the vacuum degree reaches the order of 1Pa.

[0064] 2. Heating the workpiece. Turn on the induction heating coil to heat the workpiece until the temperature displayed by the thermocouple reaches 165°C, and maintain a constant temperature.

[0065] 3. Laser cleaning the surface of the workpiece. Turn on the laser scanning system to clean the surface of the workpiece by nanosecond pulse laser sputtering, the energy density of the nanosecond pulse laser is 1000 mJ / cm 2 , the overlap rate is 30%, and then turn off the laser scanning system.

[0066] 4. Laser cladding. Open the valve, let the argon enter the nickel carbonyl source tank through the mass flow meter, load the carbonyl nickel into the vacuum chamber, adjust the flow rate of the argon, and make the partial pressure o...

Embodiment 3

[0070] 1. Preparation before cladding. Open the vacuum chamber, place the ceramic workpiece on the metal sample stage, close the vacuum chamber, turn on the vacuum pump, and evacuate the vacuum chamber until the vacuum degree reaches the order of 1Pa.

[0071] 2. Heating the workpiece. Turn on the induction heating coil to heat the metal sample stage and the workpiece until the temperature displayed by the thermocouple reaches 165°C and keep the temperature constant.

[0072] 3. Laser cleaning the surface of the workpiece. Turn on the laser scanning system to clean the surface of the workpiece by nanosecond pulse laser sputtering, the energy density of the nanosecond pulse laser is 1000 mJ / cm 2 , the overlap rate is 30%, and then turn off the laser scanning system.

[0073] 4. Laser cladding. Open the valve, let the argon enter the nickel carbonyl source tank through the mass flow meter, load the carbonyl nickel into the vacuum chamber, adjust the flow rate of the argon, a...

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Abstract

The invention discloses a method and a device for preparing a coating by using nanosecond pulse laser cladding, belonging to the technical field of the preparation of coatings on material surfaces through laser cladding, and aiming to solve the problems existing in the present nanosecond pulse laser cladding. According to the method and the device, a metal is deposited on the surface of a workpiece through MOCVD (metal organic chemical vapor deposition), and the surface of the workpiece is scanned by nanosecond laser light at the same time, so that the metal is cladded on the surface of the workpiece, and a coating with a micron or submicron level thickness is formed on the surface of the workpiece. The method and the device disclosed by the invention do not have special requirements for a substrate material, are wide in application range, and can meet the needs of the preparation of the coatings of plane workpieces and special-shaped workpieces; a prepared thin film coating has the advantages of densification, controllable thickness (micron or submicron) and firm film-substrate adhesion; meanwhile, the surface roughness of the workpiece subjected to processing is not less than that of the workpiece before cladding; the secondary processing such as grinding and polishing is not needed, so that the production cost is reduced; meanwhile, after being processed by the method and the device, the workpiece can not be deformed and can meet the processing requirements for precision workpieces.

Description

technical field [0001] The invention relates to the field of materials, in particular to the technical field of coating preparation by laser cladding on the surface of materials, in particular to a method and device for preparing coatings by nanosecond pulse laser cladding. Background technique [0002] Laser cladding refers to placing the selected coating material on the surface of the coated substrate through different feeding methods, and irradiating it with a high-energy density laser beam, so that the coating material and a thin layer of the substrate surface are simultaneously melted and solidified rapidly. Forming a surface coating with an extremely low dilution rate and a metallurgical bond with the base material, thereby significantly improving the properties of the base surface such as heat resistance, wear resistance, corrosion resistance, oxidation resistance, and electrical properties. Since Gnanamuthu applied for a patent for using laser cladding technology to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/02C23C16/18C23C16/02
Inventor 张永彬陈志磊刘柯钊宾韧王小英
Owner SICHUAN INST OF MATERIALS & TECH
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