Effects of laser surface remelting on the molten salt corrosion resistance of yttria-stabilized zirconia coatings

Yi, Peng; Mostaghimi, J.; Pershin, Larry; Xu, Pengyun; Zhan, Xianghua; Jia, Delong; Yi, Hao; Liu, Yancong

doi:10.1016/j.ceramint.2018.09.041

Cited by 30 publications

(8 citation statements)

References 30 publications

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“…By comparison, SEM does not detect V 2 O 5 , which could be because that only a small amount of V 2 O 5 remained or it permeated into deeper regions of the coating. Large amounts of t'-ZrO 2 remained after hot corrosion implies that the modified coating has a significantly improved phase stability in molten salt, which is desirable since an excellent phase stability is critical for TBC applications [23,39]. According to the XRD and EDS results, it can be identified the corrosion products in Fig.…”

Section: Hot Corrosion Behavior Of As-sprayed Ysz Coatingsmentioning

confidence: 99%

“…Laser glazing has been considered as an effective method to densify the surfaces of APS coatings, reducing the specific surface area of coatings. As a result, the reaction between the coating and the molten salt is lowered, which leads to an enhanced corrosion resistance [21][22][23][24]. Additionally, a network of vertical cracks can be produced by laser glazing, which is beneficial to the thermal shock performance of coatings; on the other hand, it is also a path for molten salt penetration, harmful to the corrosion resistance [25][26][27].…”

Section: Introduction mentioning

confidence: 99%

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Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance

et al. 2020

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Y 2 O 3 stabilized ZrO 2 (YSZ) thermal barrier coatings (TBCs) are prone to hot corrosion by molten salts. In this study, the microstructure of atmospheric plasma spraying YSZ TBCs is modified by laser glazing in order to improve the corrosion resistance. By optimizing the laser parameters, a ~18 μm smooth glazed layer with some vertical cracks was produced on the coating surfaces. The as-sprayed and modified coatings were both exposed to hot corrosion tests at 700 and 1000 ℃ for 4 h in V 2 O 5 molten salt, and the results revealed that the modified one had improved corrosion resistance. After hot corrosion, the glazed layer kept structural integrity, with little evidence of dissolution. However, the vertical cracks in the glazed layer acted as the paths for molten salt penetration, accelerating the corrosion of the non-modified coating. Further optimization of the glazed layer is needed in the future work.

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Section: Hot Corrosion Behavior Of As-sprayed Ysz Coatingsmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance

et al. 2020

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“…Any standard processing approach will not be able to create it. [11] In recent years, laser surface strengthening technologies such as laser surface alloy [12,13], laser quenching [14], laser remelting [15][16][17], and laser cladding [18][19][20] have been widely used for GCI surface strengthening. The following are some of the benefits of laser cladding technology: I. a composition that is simple to adjust, II.…”

Section: Introductionmentioning

confidence: 99%

Studying and Improving the Hardness Properties of Gray Cast Iron

Faris

Mahdi

Abed

2022

DJES

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This research focuses on the hardness of gray cast iron. Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. The machinability cannot set a specific definition. However, several indicators and directories give a clear image, the most important of which is the factors that affect the machinability of gray cast iron according to the metallurgies and the metal cutting and cutting conditions. The main goal of this research is to improve the hardness of gray cast iron. Many experiments on several samples to get different results and then compare these results to get the best which is the goal of the research. The conclusions through the practical side of this research are the different values of hardness through the different hardening processes. As the hardening processes gave a sample of grey cast iron a hardness value that differs in each type of hardening. The notes through the graph that the hardness reaches its peak in the traditional hardening, where its value is (370.6), followed by the laser hardening process, which reaches (321.6) The amount of increase between the hardness of the laser and the traditional hardness takes the value of (15.24 %) The work on samples in the form of aggregates, and each group will be treated in a specific way and then subject to tests.

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“…Ahmadi-Pidani et al [32] reported that laser glazing could enhance the hot corrosion resistance of plasma-sprayed CYSZ TBCs because the specific reactive area of the dense glazed surface layer was reduced. Yi et al [33] modified the plasma-sprayed YSZ coatings by laser remelting, and a dense and smooth surface was obtained, which reduced the coat permeability to the molten salts, leading to improved resistance to hot corrosion. Thus, laser remelting is a prospective approach for increasing the resistance to hot corrosion of TBCs, since it is expected to close the pores of the plasma-sprayed coating and produce a dense surface layer.…”

Section: Introductionmentioning

confidence: 99%

Effects of Selective Laser Modification and Al Deposition on the Hot Corrosion Resistance of Ceria and Yttria-Stabilized Zirconia Thermal Barrier Coatings

Zhang

et al. 2019

Coatings

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The air-plasma-sprayed ceria and yttria-stabilized zirconia (CYSZ) coating was modified by selective laser remelting and Al deposition to enhance hot corrosion resistance. The dotted coating was obtained after selective laser remelting. Magnetron sputtering was used to deposit an Al film on the dotted coating, and a vacuum heat treatment was subsequently performed to produce a dense α-Al2O3 overlay. Hot corrosion behavior of the following three types of coatings was investigated: plasma-sprayed, dotted, and dotted coatings combined with Al deposition (DA). Hot corrosion behaviors were evaluated in a mixture of 55 wt % V2O5 and 45 wt % Na2SO4 molten salts at 1000 °C for 30 h. The hot corrosion reaction between molten salts and zirconia stabilizers (Y2O3 and CeO2) led to the generation of monoclinic zirconia, YVO4, and CeVO4 plate-shaped crystals, and the mineralization of CeO2. The results indicated that the hot corrosion resistance of the DA coating was the best, and the dotted coating had superior hot corrosion resistance in comparison with the plasma-sprayed coating. The minimal surface roughness and dense dotted units improved the hot corrosion resistance of the dotted coating. The dense α-Al2O3 overlay with chemical inertness effectively inhibited the infiltration of molten salts, which led to the optimal hot corrosion resistance of the DA coating.

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Effects of laser surface remelting on the molten salt corrosion resistance of yttria-stabilized zirconia coatings

Cited by 30 publications

References 30 publications

Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance

Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance

Studying and Improving the Hardness Properties of Gray Cast Iron

Effects of Selective Laser Modification and Al Deposition on the Hot Corrosion Resistance of Ceria and Yttria-Stabilized Zirconia Thermal Barrier Coatings

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