Method and device of laser impact and thermal spraying composite coating preparation

A laser shock and thermal spraying technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problem of wear resistance and fretting resistance performance that cannot meet the harsh environment of engineering, fracture and failure of structural metal parts, etc. Reduced engine efficiency and other problems, to achieve the effects of small plastic deformation, reduced porosity, and improved mechanical properties

Inactive Publication Date: 2010-06-30
JIANGSU UNIV
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Problems solved by technology

[0004] Although these technologies can prepare uniform coatings with certain properties on the surface of the metal substrate, the above-mentioned technologies and the brush plating technology all produce thermal effects during the coating process, and the prepared coatings have large porosity and residual Tensile stress state, prone to surface micro-cracks leading to fracture and failure of structural metal parts
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  • Method and device of laser impact and thermal spraying composite coating preparation
  • Method and device of laser impact and thermal spraying composite coating preparation
  • Method and device of laser impact and thermal spraying composite coating preparation

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Embodiment

[0031] The following is an example of coating prepared by combining laser shock and thermal spraying. Using thermal spraying equipment to spray NiCrBSiC (Ni60AA) powder on the surface of quenched 45 steel, the composition is Cr-18.09, Si-4.84, Fe-15.63, B-3.6, C -0.6, Ni balance (wt.%), the sprayed powder is round particles. The Nd: glass with a repetition rate of 0.5 Hz, a spot diameter of 3 mm, a pulse energy of 15 J, a laser wavelength of 1054 nm, and a laser pulse width of 20 ns are used to perform impact strengthening treatment on the metal substrate.

[0032] figure 2 Comparison of particle morphology of coatings prepared for laser shock and thermal spraying and thermal spraying coatings. (a) is the morphology of coating particles after thermal spraying; (b) is the morphology of coating particles prepared by laser shock and thermal spraying. It can be seen that the diameter of coating particles after thermal spraying is about 30um, and the diameter of coating particles ...

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Abstract

A method and a device of laser impact and thermal spraying composite coating preparation relates to the nontraditional machining field. At first, the invention uses a thermal spraying device to spay powder onto the surface of a metal substrate in order to form a coating. The invention is characterized in that laser is used to impact the metal substrate surface coated with the coating and the coating which has low porosity, high bonding strength and compression stress is formed. The device implementing the method comprises a computer control device, a thermal spraying system I, a laser impact system II, a sealed treatment room, a clamping device, a five-axis workbench and a vacuum pump, which are connected in turn. The thermal spraying system I comprises the thermal spraying device and sprayed powder. The laser impact system II comprises a nanosecond laser generator, laser beam, a light pipe, a 45 degrees totally reflective mirror, a facula adjusting device, a K9 glass window and an automatic spraying system. The invention can form the coating on the surface of the metal, increase the porosity of the coating, improve the bonding strength of the coating and the substrate and change the state of residual stress.

Description

technical field [0001] The invention relates to the field of special processing, in particular to a method and device for composite preparation of laser shock and thermal spraying, especially suitable for the preparation of metal coatings below 1mm on structural metal surfaces with wear resistance and fretting resistance. Background technique [0002] The surface properties of structural metals are crucial to the mechanical properties, fatigue properties and corrosion resistance of structural parts. At present, various coating technologies such as thermal spraying technology, plasma spraying technology, brush plating technology, high-speed arc spraying technology, plasma arc cladding Technology, etc., can greatly improve the surface properties of structural metals, and can obtain good gain effects. [0003] Fangming’s patents closest to this method are “Anticorrosion Technology of Metal Thermal Spraying and Powder Coating Electrostatic Spraying Composite Coating (Patent Appl...

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Application Information

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IPC IPC(8): C23C4/18C21D1/09C22F3/00
Inventor 罗开玉鲁金忠张永康张朝阳孙桂芳钟俊伟张磊
Owner JIANGSU UNIV
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