Research on the Microstructure of Laser Remelted As-sprayed TiB2-TiC0.3N0.7 based Composite Coating

Ceramic coatings with excellent properties of wear resistance, corrosion resistance, oxidation resistance, stability in acid and alkaline environments, and good bond strength with a metallic substrate, are widely used in different industries. Air plasma spraying has high energy and efficiency for de...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-03, Vol.2459 (1), p.012025
Main Authors: Liu, Caiyan, Mao, Zhengping
Format: Article
Language:English
Subjects:
Acid resistance
Air plasma
Bonding strength
Ceramic coatings
Corrosion resistance
Corrosive wear
Diamond pyramid hardness tests
Laser beam heating
Laser beam melting
Lasers
Melting
Melting points
Microcracks
Microstructure
Oxidation resistance
Phase composition
Physics
Plasma spraying
Protective coatings
Sprayed coatings
Substrates
Surface roughness
Titanium diboride
Wear resistance
Weibull distribution
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Summary:Ceramic coatings with excellent properties of wear resistance, corrosion resistance, oxidation resistance, stability in acid and alkaline environments, and good bond strength with a metallic substrate, are widely used in different industries. Air plasma spraying has high energy and efficiency for depositing ceramic materials with a high melting point. Due to intrinsic porosity and mechanical bond strength between coating and substrate, laser remelting technology can be applied to the coating surface for improving coating properties. As-sprayed TiB2-TiC0.3N0.7-based composite coating was surface remelted by laser. The surface roughness of as-sprayed and laser-remelted coatings was measured. The phase composition and the microstructure as well as the Vickers microhardness of coatings were studied by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and Vickers indentation instrument. It is found that the phase composition does not change after laser remelting. However, the surface roughness of laser-remelted coating is smoother than that of as-sprayed coating. And the microhardness on the cross-section is increased after laser remelting. There is a micro-crack in the laser-remelted coating due to the fast heating and cooling of the laser. The microhardness of the laser-remelted coating is increased with bimodal Weibull distribution.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2459/1/012025