Thermal conductivity and erosion durability of composite two-phase air plasma sprayed thermal barrier coatings

Schmitt, Michael P.; Amarendra, K.; Zhu, Dongming; Dorfman, Mitchell R.; Wolfe, Douglas E.

doi:10.1016/j.surfcoat.2015.08.010

Cited by 20 publications

(10 citation statements)

References 32 publications

(42 reference statements)

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“…Considerable amount of research has been done in the field of erosion behavior of TBCs at room temperature as well as high temperature by Wellman et al [9,[12][13][14][15] and other scientific groups [16][17][18][19][20][21][22][23]. The effect of CMAS on the mechanical and chemical degradation of the TBCs was thoroughly studied [1,10,24,25].…”

Section: Erosion Behavior Of Eb-pvd 7ysz Coatings Under Corrosion/erosion Regime: Effect Of Tbc M Icrostructure and The Cmas Chemistrymentioning

confidence: 99%

Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Steinberg

Naraparaju

Heckert

et al. 2018

Journal of the European Ceramic Society

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Section: Erosion Behavior Of Eb-pvd 7ysz Coatings Under Corrosion/erosion Regime: Effect Of Tbc M Icrostructure and The Cmas Chemistrymentioning

confidence: 99%

Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Steinberg

Naraparaju

Heckert

et al. 2018

Journal of the European Ceramic Society

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“…Additionally, composite structures have been shown to increase the erosion durability of cubic phase EB-PVD [12] and APS [21] coatings. This study investigates the process-structure-property relations in a new hybrid process, Plasma Spray -Physical Vapor Deposition (PS-PVD).…”

Section: Introductionmentioning

confidence: 99%

Process-structure-property relations for the erosion durability of plasma spray-physical vapor deposition (PS-PVD) thermal barrier coatings

Schmitt

Harder

Wolfe

2016

Surface and Coatings Technology

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New thermal barrier coating (TBC) materials and microstructures are under development to increase gas turbine operating temperatures beyond the ~1200°C threshold of standard 7 wt. % yttria stabilized zirconia (7YSZ). To deposit these advanced coatings, a new thermal spray deposition technique is used: Plasma Spray -Physical Vapor Deposition (PS-PVD). PS-PVD is capable of depositing from the vapor phase to yield strain tolerant columnar microstructures similar to Electron Beam -Physical Vapor Deposition (EB-PVD) or, alternatively, the traditional splat-like lamellar microstructure common to Air Plasma Spray (APS). This study investigates the process-structure relationships and resulting erosion response for plasma gas flow, amperage, and feed rate. It was found that in the selected design space, porosity and surface roughness vary © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ from ~12-26% and ~5-10 µm, respectively. Erosion behavior is discussed and the mechanism is identified to be heavily dependent upon the intercolumnar spacing. The lowest erosion rates are similar to EB-PVD, while the highest erosion rates were closer to APS. This is attributed to the hybrid nature of the PS-PVD process and provides an opportunity to tailor coatings with a wide range of properties, and thus performance.

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“…The sole paper exploring GAP indicates a value of approximately 3.2 W/m·K at elevated temperatures . However, in previous studies it was found that the thermal conductivity of the toughening phase had a minor effect on the thermal conductivity of GZO‐based composite coatings . This response has been observed for bulk ceramic composites of other materials such as Al 2 O 3 and mullite in YSZ, indicating series‐like behavior.…”

Section: Resultsmentioning

confidence: 92%

“…Unfortunately, the changes are not well understood and still result in toughness values significantly lower than that of 7YSZ, ultimately limiting their applicability. Conversely, extrinsically modifying the apparent toughness by incorporating secondary toughening phases has been previously shown by the authors to produce significant improvements in the erosion durability for two design architectures (multilayer and composite) . It was shown that by incorporating a secondary phase with higher toughness, the overall durability of the coating system was improved.…”

Section: Introductionmentioning

confidence: 99%

Durable aluminate toughened zirconate composite thermal barrier coating (TBC) materials for high temperature operation

et al. 2019

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Research on advanced thermal barrier coating (TBC) materials capable of operating beyond 1200°C has primarily focused on the rare earth zirconate pyrochlores, particularly gadolinium zirconate (Gd 2 Zr 2 O 7 -GZO). The drawback of this material is a significant reduction in durability due to a low fracture toughness. This study investigates utilization of a thermodynamically compatible gadolinia alumina perovskite (GdAlO 3 -GAP) toughening phase to improve the durability of GZO. Dense pellets were fabricated to assess the material properties with minimal microstructural influence. Thermal stability, elastic modulus, hardness, indentation fracture resistance and erosion durability were evaluated for GZO, GAP, and composite pellets containing 10, 30, and 50 wt.% GAP. It was demonstrated that GAP and GZO are thermodynamically compatible through 1600°C and thus capable of operating well beyond the limits of traditional 7 wt.% yttria stabilized zirconia (YSZ). Grain sizes are maintained due to a lack of diffusion, and thus microstructural stability is enhanced. The GAP fracture toughness was shown to be over 2X that of GZO while exhibiting a lower elastic modulus and similar hardness. The 50:50 GZO-GAP composite exhibited a 63% reduction in the absolute erosion rate, demonstrating the immense toughening capabilities of this system. The implications for composite TBCs utilizing this system are discussed, along with future work. K E Y W O R D Saluminates, composites, durability, gadolinium zirconate, thermal barrier coatings

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Thermal conductivity and erosion durability of composite two-phase air plasma sprayed thermal barrier coatings

Cited by 20 publications

References 32 publications

Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry

Process-structure-property relations for the erosion durability of plasma spray-physical vapor deposition (PS-PVD) thermal barrier coatings

Durable aluminate toughened zirconate composite thermal barrier coating (TBC) materials for high temperature operation

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