Microstructural characterization of modified plasma spray LZ/YSZ thermal barrier coating by laser glazing

Arshad, Azrina; Yajid, Muhamad Azizi Mat; Idris, Mohd Hasbullah

doi:10.1016/j.matpr.2020.04.145

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…Benefitting from the excellent physical and chemical properties of zirconia (ZrO 2 ) ceramics, such as good thermal and chemical stability, outstanding corrosion resistance, excellent mechanical properties, and high oxygen ion conductivity, it has developed abundant applications in the areas of cutting processing tools, [ 1,2 ] gas turbines, [ 3,4 ] fuel cells, [ 5,6 ] and oxygen sensors. [ 7,8 ] Many applications require the connection of ZrO 2 ceramics and metals to achieve overall performance advantages, especially in the field of solid oxide fuel cells (SOFC).…”

Section: Introductionmentioning

confidence: 99%

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Wang

Yang

et al. 2022

Adv Eng Mater

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Section: Introductionmentioning

confidence: 99%

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Wang

Yang

et al. 2022

Adv Eng Mater

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“…While cooling to room temperature, the microstructure of the glazed layers changes from lamellar to columnar in the direction of heat flow. 35 After hot corrosion, ZrO 2 and YVO 4 corrosion products in YSZ coatings cause the ZrO 2 phase to shift from tetragonal to monoclinic. This transition to the monoclinic phase caused an undesired volume increase of roughly 3% to 5%, 8 which may have harmed the coating.…”

Section: Isothermal Hot Corrosionmentioning

confidence: 99%

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Avcı,

Karabaş,

Akdoğan Eker

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The purpose of this research is to look into the effect of laser surface modification on the hot corrosion and hot corrosion + calcium–magnesium aluminosilicate (CMAS) resistance of YSZ thermal barrier coating. Metco AMDRY 997 (Ni–22Cr–10Al–Y) powder was coated as a bond coat on the AISI 304L stainless steel substrate using a high-velocity oxy-fuel spray technique. As a ceramic top layer, 204 NS YSZ (ZrO2·8Y2O3) particles were plasma sprayed on the bond coat. Following that, the entire coating surface was treated with a 20-kHz pulsed CO2 laser to increase the coatings’ surface performance. A corrosion test was carried out in a box furnace for 20 h at 1050 °C. SEM images of laser-glazed coatings revealed denser surfaces than those of air-spraying coatings. The laser-modified coating is more resistant to hot corrosion than unmodified coatings. The X-ray diffraction analysis revealed that the reaction between yttria (Y2O3) and V2O5 resulted in the formation of YVO4 crystals as a corrosion product. According to energy dispersive spectroscopy results, laser-glazed coatings reduced molten salt diffusion from surface to bond coat. As a result, laser-glazed coatings demonstrated improved hot corrosion resistance and decreased corrosion products on the bond coat zone. After the hot corrosion test, the laser-treated composite had a 55% lower thermally grown oxide layer than untreated APS YSZ. The optimum laser parameter was used as 77.7 W laser power, 120 mm/s scanning speed, and 215 mm laser distance.

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“…The plasma plume has a high temperature, concentrated energy beam, and high production efficiency, and could melt all powders with a high melting point, so it can spray a wide range of materials and can be used to prepare a variety of coatings [1][2][3] . However, the characteristics of the plasma spraying process determine that the bond strength between the substrate and the ceramic coating is not high enough.…”

Section: Introductionmentioning

confidence: 99%

Research on the Microstructure of Laser Remelted As-sprayed TiB₂-TiC_0.3N_0.7 based Composite Coating

Liu

Mao²

2023

J. Phys.: Conf. Ser.

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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.

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Microstructural characterization of modified plasma spray LZ/YSZ thermal barrier coating by laser glazing

Cited by 11 publications

References 23 publications

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Research on the Microstructure of Laser Remelted As-sprayed TiB₂-TiC_0.3N_0.7 based Composite Coating

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Microstructural characterization of modified plasma spray LZ/YSZ thermal barrier coating by laser glazing

Cited by 11 publications

References 23 publications

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Blackening Mechanism and Mechanical Properties Variation of Zirconia Ceramic Induced by Active Metal Brazing

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

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

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Product

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About

Research on the Microstructure of Laser Remelted As-sprayed TiB₂-TiC_0.3N_0.7 based Composite Coating