Microstructure and oxidation resistance of CoNiCrAlY coating manufactured by laser powder bed fusion

Luo, Hao; Li, Xiaoqiang; Pan, Cunliang; Pang, Huimin; Zeng, Kai; Hu, Ke; Li, Huiyun; Chao, Yang

doi:10.1016/j.surfcoat.2021.127846

Cited by 9 publications

(8 citation statements)

References 30 publications

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“…It was shown that by optimizing the process conditions, the obtained coating yielded favorable characteristics such as remarkably low residual stress and porosity as well as significant dilution zones that promote adhesion strength. Moreover, in another research [199], the feasibility of producing a CoNiCrAlY coating by a laser powder bed fusion (LPBF) method was investigated. The results revealed that using optimal operation parameters, favorable coating characteristics such as good metallurgical bonding and low porosity with no evident cracks were achieved.…”

Section: Concluding Remarks and Future Perspectivesmentioning

confidence: 99%

A Review on the Enhancement of Mechanical and Tribological Properties of MCrAlY Coatings Reinforced by Dispersed Micro and Nanoparticles

2022

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The application of metal-matrix composite coatings for protecting and improving the service life of sliding components has demonstrated to have the potential of meeting the requirements of a diverse range of engineering industries. Recently, a significant body of research has been devoted to studying the mechanical and tribological performance of dispersion-strengthened MCrAlY coatings. These coatings belong to a class of emerging wear-resistant materials, offering improved properties and being considered as promising candidates for the protection of engineering structural materials exposed to tribological damage, especially at elevated temperature regimes. This paper attempts to comprehensively review the different reinforcements used in the processing of MCrAlY-based alloys and how they influence the mechanical and tribological properties of the corresponding coatings. Furthermore, the major fabrication techniques together with their benefits and challenges are also reviewed. Discussion on the failure mechanisms of these coatings as well as the main determining factors are also included. In addition, a comprehensive survey of studies and investigations in recent times are summarized and elaborated to further substantiate the review.

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Section: Concluding Remarks and Future Perspectivesmentioning

confidence: 99%

A Review on the Enhancement of Mechanical and Tribological Properties of MCrAlY Coatings Reinforced by Dispersed Micro and Nanoparticles

2022

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“…A large set of corrosion-resistant materials has been developed for magnetron sputtering of the Me-Cr-Al-Y system, which is most widely used as protective coatings under conditions of high-temperature sulfide-oxide corrosion [20]. Me-Cr-Al-Y heat-resistant coatings reduce the temperature of the metal and have low thermal conductivity, low density and withstand cyclic loads [13,[21][22][23]. Me-Cr-Al-R coating of a regulated thickness (60-80 µm) has been developed for working blades of turbine engines with a service life of up to 10,000 h [3,5,8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Structural-Phase State and Properties of a Multilayer Co-Cr-Al-Y Coating

et al. 2022

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The article describes the effect of heat treatment on the structural-phase state and properties of a multilayer Cr-Al-Co-Y coating obtained by magnetron sputtering. Heat treatment was carried out at 400, 800 and 1000 °C. The study of the microstructure was carried out by electron microscopy with energy dispersive analysis and powder X-ray diffraction. The surface of the samples was studied by atomic force microscopy. The thickness of the Co-Cr-Al-Y coatings was 1.5–1.7 ± 0.2 µm. The obtained coatings are characterized by a hardness of 4.7–6.4 GPa. A distinctive feature of the layers is the absence of a crystalline structure in some areas of the coating. The main process occurring during the thermal treatment is the formation of a spinel-type phase. For a single-layer sample after heat treatment at 400 °C, it was not possible to fix extraneous reflections except for the reflections of the silicon substrate 111 and 220. For the rest of the samples, the appearance of reflections of a number of phases was noticed, such as: SiO2, CoO, AlSi0.5O2.5 and CrAl0.42Si1.58. An increase in the treatment temperature up to 800 °C did not lead to significant changes. In the case of the multilayer sample, the reflections of various impurity phases disappeared and the Co3O4 phase was formed. For samples treated at 1000 °C, the formation of a spinel-type phase (Co3O4-CoCr2O4) was observed in all cases. Data on the structural-phase state and properties of the multilayer Co-Cr-Al-Y coating can be used to predict the nature of such coatings after heat treatment.

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“…To maintain thermal insulation and integrity at very high temperatures, thermal barrier coatings are made from multiple materials [1][2][3][4]. This multiple-component system provides unique insulation properties but also causes corrosion degradation problems.…”

Section: Introductionmentioning

confidence: 99%

“…Microstructure and isothermal oxidation of CoNiCrAlY coatings was also studied by H. Luo et al [2]. The coating was produced on IN718 alloy by using laser powder bed fusion (LPBF) and heated to 1100 • C for a time period of 1 h to 100 h. The LPBF is an additive manufacturing process, where the powder can be deposited in line with the path defined by computer-aided design.…”

Section: Introductionmentioning

confidence: 99%

“…Under low thermal cycling, the alumina layer was also found dense and crack-free. Improved microstructural and oxidation properties are attributed to the LPBF process which build-up columnar dendrite and equated grains that helps in producing a thin uniform oxide [2]. The increase in time of oxidation promotes the formation of spinel oxide which degrade corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

Niaz

Fuhaid²,

Faraz³

2022

Coatings

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The thermal insulation and integrity of the thermal barrier coating is hampered by the formation of mixed oxide at intermediate bond coat. The existing reported work correlates growth of mixed oxide to the microstructural and phase changes. The track mostly used to study these changes is scanning electron microscopy, X-ray diffraction, and electrochemical testing. Oxide growth is principally an electrochemical process; hence a thirst exists to study this aspect by using advanced electrochemical techniques. In this study scanning electrochemical microscopy is used to reveal the electrochemical activity in the closest vicinity of the surface. A raster scan of 500 µm area was carried out by microelectrode in an electrolyte at a distance of 5 µm above the surface to record the current profile. The activity at the surface was confirmed by current distance curves. The tip of the microelectrode was approached from 60 µm height to 2 µm above the surface. The current–distance curves for the coating without heat-treatment show an active surface while the heat-treated one show non active surface. The average coating electrochemical response was further studied by polarization curves impedance spectroscopy. The X-ray photoelectron spectroscopy results show that oxidation and formation of the mixed oxide increase with polarization.

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Microstructure and oxidation resistance of CoNiCrAlY coating manufactured by laser powder bed fusion

Cited by 9 publications

References 30 publications

A Review on the Enhancement of Mechanical and Tribological Properties of MCrAlY Coatings Reinforced by Dispersed Micro and Nanoparticles

A Review on the Enhancement of Mechanical and Tribological Properties of MCrAlY Coatings Reinforced by Dispersed Micro and Nanoparticles

Effect of Heat Treatment on the Structural-Phase State and Properties of a Multilayer Co-Cr-Al-Y Coating

Understanding Corrosion Degradation Processes of a Multi-Component CoNiCrAlY-Coating System

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