Influence of microstructure on thermal cycling lifetime and thermal insulation properties of yttria-stabilized zirconia thermal barrier coatings for diesel engine applications

Thibblin, Anders; Jönsson, Stefan; Olofsson, Ulf

doi:10.1016/j.surfcoat.2018.07.005

Cited by 53 publications

(21 citation statements)

References 42 publications

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“…This explains why there was no significant difference in heat flux between the nano and conventional YSZ. Other authors have shown that YSZ coatings with a significant amount of nanozones can reduce thermal conductivity, 23 improve reflectance 27 and that smaller pores may reduce the radiative heat transfer. 43…”

Section: Discussionmentioning

confidence: 99%

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Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

Thibblin

Kianzad

Jönsson

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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Thermal barrier coatings have the potential to improve the fuel efficiency of heavy-duty diesel engines by reducing heat losses. A method for in-situ measurement of heat flux from the combustion chamber of a heavy-duty diesel engine has been developed and was used to study the running-in behaviour of different thermal barrier coating materials and types of microstructures. The in-situ measurements show that the initial heat flux was reduced by up to 4.7% for all investigated thermal barrier coatings compared to a steel reference, except for an yttria-stabilized zirconia coating with sealed pores that had an increase of 12.0% in heat flux. Gd2Zr2O7 had the lowest initial value for heat flux. However, running-in shows the lowest values for yttria-stabilized zirconia after 2–3 h. Potential spallation problems were observed for Gd2Zr2O7 and La2Zr2O7.

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Section: Discussionmentioning

confidence: 99%

“…26,28 However, the thermal conductivity of segmented coatings is higher than in conventional APS coatings due to the denser microstructure with fewer splat gaps. 27,29…”

Section: Introductionmentioning

confidence: 99%

Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

Thibblin

Kianzad

Jönsson

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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“…Due to the restriction of feedstock supply, PS-PVD coatings other than YSZ were hardly manufactured and investigated [15][16][17]. It cannot be denied that YSZ used as TBC is beyond comparison below temperature of 1200 • C [18,19].…”

Section: Introductionmentioning

confidence: 99%

Correlation of Feedstock Powder Characteristics with Microstructure, Composition, and Mechanical Properties of La2Ce2O7 Coatings Produced by Plasma Spray-Physical Vapor Deposition

Zhao

et al. 2020

Coatings

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By virtue of plasma spray-physical vapor deposition (PS-PVD) process, coatings in possession of columnar structures can be obtained by suitable processing parameters coupled with specially designed powder feedstock. In this paper, the influence of powder characteristics on the La2Ce2O7 (LC) coating microstructures was investigated by using three kinds of feedstock powders with same PS-PVD processing parameters. It was found that small agglomerated feedstock, weak binding strength, and small primary particle sizes can enhance the feedstock evaporation rate, thus obtaining well columnar structured coatings. X-ray diffraction (XRD) patterns revealed that except for a very small amount of La2O3 the main phase of all the coatings is LC. The La/Ce atomic ratios reduced in the coatings compared to the feedstocks, especially the coatings with better columnar structure. Super-lattice patterns were observed by transmission electron microscope (TEM), which means that the LC phase is supposed to be pyrochlore structure. Furthermore, the mechanical properties evaluated by nano-indentation tests indicated that both the hardness and Young’s modulus of each coating show negative correlations with the porosity inside the columns.

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“…In a TBC system, the material used as the ceramic topcoat is expected to meet some basic criteria such as low thermal conductivity, high melting point, chemical inertness, and phase stability [15,16]. The most widely used material of the ceramic topcoat is yttria partially stabilized zirconia (6-8 wt % YSZ) because of its many merits such as low thermal conductivity, relatively high TEC, and adequate fracture toughness [17][18][19]. However, the YSZ also has several demerits, for example, hot corrosion and spallation which may shorten the lifetimes of the TBCs [20][21][22].…”

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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Influence of microstructure on thermal cycling lifetime and thermal insulation properties of yttria-stabilized zirconia thermal barrier coatings for diesel engine applications

Cited by 53 publications

References 42 publications

Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

Running-in behaviour of thermal barrier coatings in the combustion chamber of a diesel engine

Correlation of Feedstock Powder Characteristics with Microstructure, Composition, and Mechanical Properties of La2Ce2O7 Coatings Produced by Plasma Spray-Physical Vapor Deposition

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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