Effect of long-term heat-treatment at 1150 °C on the microstructure and properties of thermal barrier coatings based on ZrO 2 –4 mol.% Y 2 O 3 –1 mol.% Gd 2 O 3 –1 mol.% Yb 2 O 3

Bobzin, Kirsten; Zhao, Li‐Dong; Öte, Mehmet; Königstein, Tim

doi:10.1016/j.surfcoat.2016.06.055

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…The addition ofAl2O3, Dy2O3 can decrease lattice energy and increase the coefficient of thermal expansion [7,56]. Part of Zr 4+ was replaced by doping rare-earth or alkaline earth oxide, substitutional type solid solution was formed, which can play the role of stabilizing ZrO2 tetragonal phase structure, and materials such as Gd2O3 and Yb2O3 can make YSZ maintain phase stability effectively [57,58]. Based on the theory of Lewis Acid and Alkali, adopting Gd2O3, Yb2O3, La2O3, Sc2O3, and other strong acidic oxides to partly replace Y2O3 can reduce driving force for the reaction and improve Na2SO4 + V2O5 molten salt thermal corrosion resistance of YSZ [59][60][61][62][63][64], adding rare-earth…”

Section: Ysz Doped By Oxidementioning

confidence: 99%

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Zhao

et al. 2021

Coatings

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Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.

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Section: Ysz Doped By Oxidementioning

confidence: 99%

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Zhao

et al. 2021

Coatings

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“…Many ceramic-based materials have been well-established as proper TBC materials on account of their low thermal conductivity, for instance, yttria-stabilized zirconia (YSZ). Nevertheless, the inherent brittle character significantly restricts the reliability of ceramicbased TBCs under mechanical loading or thermal shock [10,11].…”

Section: Introductionmentioning

confidence: 99%

Cold-Sprayed Multilayer Thermal Barrier–Catalytic Coatings for Engine Pistons: Coatings Design and Properties

Maev

Tjong²,

Leshchinsky

et al. 2022

Coatings

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Yttrium-stabilized zirconia thermal barrier coatings (TBCs) of combustion chambers and piston crowns are used most frequently to increase the chamber temperature and the internal combustion engine efficiency. The development of multilayer metal matrix composite coating is of great importance to diminish the ceramic thermal barrier coating’s brittleness and susceptibility to degradation providing the similar thermal insulation. Our group is developing multilayer TBCs based on intermetallic (Fe-Al) compounds combined with alternating zirconia-based layers made by low-pressure cold spraying (LPCS) and sintering. The Fe-Al intermetallic phase was synthesized during reaction sintering of stainless steel and Al particles in the powder layer previously obtained by cold spraying. A double-nozzle low-pressure cold-spraying gun was used to deposit two layers (stainless steel and Al-YSZ) per one track. The effect of the breaking of the brittle ZrO2 particles due to impingement with the substrate results in the formation of a relatively homogeneous structure with ZrO2 particle size of 3–10 μm. Cold-spray deposition of additional Cu-Ni-Graphene catalytic layers on the TBCs is developed to improve performance and emissions of engines. The microstructure, thermal conductivity, thermal shock behavior and microhardness of TBCs were examined and discussed.

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A New Al₂O₃‐Protected EB‐PVD TBC with Superior CMAS Resistance

Qin,

Cao,

Gao

et al. 2023

Advanced Science

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Calcium‐magnesium‐aluminium‐silicate (CMAS) attack is a longstanding challenge for yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) particularly at higher engine operating temperature. Here, a novel microstructural design is reported for YSZ TBCs to mitigate CMAS attack. The design is based on a drip coating method that creates a thin layer of nanoporous Al2O3 around YSZ columnar grains produced by electron beam physical vapor deposition (EB‐PVD). The nanoporous Al2O3 enables fast crystallization of CMAS melt close to the TBC surface, in the inter‐columnar gaps, and on the column walls, thereby suppressing CMAS infiltration and preventing further degradation of the TBCs due to CMAS attack. Indentation and three‐point beam bending tests indicate that the highly porous Al2O3 only slightly stiffens the TBC but offers superior resistance against sintering in long‐term thermal exposure by reducing the intercolumnar contact. This work offers a new pathway for designing novel TBC architecture with excellent CMAS resistance, strain tolerance, and sintering resistance, which also points out new insight for assembly nanoporous ceramic in traditional ceramic structure for integrated functions.

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Effect of long-term heat-treatment at 1150 °C on the microstructure and properties of thermal barrier coatings based on ZrO 2 –4 mol.% Y 2 O 3 –1 mol.% Gd 2 O 3 –1 mol.% Yb 2 O 3

Cited by 11 publications

References 16 publications

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Cold-Sprayed Multilayer Thermal Barrier–Catalytic Coatings for Engine Pistons: Coatings Design and Properties

A New Al₂O₃‐Protected EB‐PVD TBC with Superior CMAS Resistance

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Effect of long-term heat-treatment at 1150 °C on the microstructure and properties of thermal barrier coatings based on ZrO 2 –4 mol.% Y 2 O 3 –1 mol.% Gd 2 O 3 –1 mol.% Yb 2 O 3

Cited by 11 publications

References 16 publications

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Cold-Sprayed Multilayer Thermal Barrier–Catalytic Coatings for Engine Pistons: Coatings Design and Properties

A New Al2O3‐Protected EB‐PVD TBC with Superior CMAS Resistance

Contact Info

Product

Resources

About

A New Al₂O₃‐Protected EB‐PVD TBC with Superior CMAS Resistance