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Low Thermal Conductivity Yttrium Aluminum Garnet Thermal Barrier Coatings Made by the Solution Precursor Plasma Spray: Part II—Planar Pore Formation and CMAS Resistance

Low Thermal Conductivity Yttrium Aluminum Garnet Thermal Barrier Coatings Made by the Solution... Low thermal conductivity in yttrium aluminum garnet (YAG)-based thermal barrier coatings (TBCs) made by solution precursor plasma spray (SPPS) can be achieved by creating planar arrays of porosity called inter-pass boundaries (IPBs) as shown in Part I. In the current work, the mechanism of IPBs formation is studied through analysis of precursor entrainment and collection of single/raster step deposition patterns. It is concluded that the IPBs are formed by trapping precursor that under/over penetrates the plasma jet. CMAS interaction tests on SPPS YAG TBCs with heavy IPBs show an improvement of 123X and 15X over APS YSZ and SPPS YAG-light IPBs TBCs, respectively. It is demonstrated that the exceptional coating performance is because of the engineered heavy IPBs which branch out from the vertical cracks and run parallel to the surface. The CMAS melt gets drawn in the IPBs due to the capillary forces, leading to a shallow infiltration depth. The IPBs have a porosity of 70%, thus act as reservoirs for CMAS. Based on the favorable results, an alternate CMAS mitigation strategy is proposed that solely relies on microstructural features instead of the conventional approach where a vigorous reaction between CMAS-TBCs is desirable to form secondary phases. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Thermal Spray Technology Springer Journals

Low Thermal Conductivity Yttrium Aluminum Garnet Thermal Barrier Coatings Made by the Solution Precursor Plasma Spray: Part II—Planar Pore Formation and CMAS Resistance

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Publisher
Springer Journals
Copyright
Copyright © 2018 by ASM International
Subject
Materials Science; Surfaces and Interfaces, Thin Films; Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Operating Procedures, Materials Treatment; Analytical Chemistry
ISSN
1059-9630
eISSN
1544-1016
DOI
10.1007/s11666-018-0727-x
Publisher site
See Article on Publisher Site

Abstract

Low thermal conductivity in yttrium aluminum garnet (YAG)-based thermal barrier coatings (TBCs) made by solution precursor plasma spray (SPPS) can be achieved by creating planar arrays of porosity called inter-pass boundaries (IPBs) as shown in Part I. In the current work, the mechanism of IPBs formation is studied through analysis of precursor entrainment and collection of single/raster step deposition patterns. It is concluded that the IPBs are formed by trapping precursor that under/over penetrates the plasma jet. CMAS interaction tests on SPPS YAG TBCs with heavy IPBs show an improvement of 123X and 15X over APS YSZ and SPPS YAG-light IPBs TBCs, respectively. It is demonstrated that the exceptional coating performance is because of the engineered heavy IPBs which branch out from the vertical cracks and run parallel to the surface. The CMAS melt gets drawn in the IPBs due to the capillary forces, leading to a shallow infiltration depth. The IPBs have a porosity of 70%, thus act as reservoirs for CMAS. Based on the favorable results, an alternate CMAS mitigation strategy is proposed that solely relies on microstructural features instead of the conventional approach where a vigorous reaction between CMAS-TBCs is desirable to form secondary phases.

Journal

Journal of Thermal Spray Technology – Springer Journals

Published: Jun 1, 2018

References

  • Thermal Barrier Coatings for Gas-Turbine Engine Applications
    Padture, NP; Gell, M; Jordan, EH
  • Thermal Barrier Coatings for the 21st Century
    Stiger, MJ; Yanar, NM; Topping, MG; Pettit, FS; Meier, GH
  • Thermal Barrier Coatings for Aircraft Engines: History and Directions
    Miller, RA
  • Mechanisms Controlling the Durability of Thermal Barrier Coatings
    Evans, AG; Mumm, DR; Hutchinson, JW; Meier, GH; Pettit, FS
  • Recent Developments in the Field of Thermal Barrier Coatings
    Vassen, R; Stuke, A; Stöver, D
  • Phase Stability in Plasma Sprayed Partially Stabilized Zirconia-Yttria
    Miller, RA; Smialek, JL; Garlick, RG
  • Failure of Thermal Barrier Coatings Subjected to CMAS Attack
    Li, L; Hitchman, N; Knapp, J
  • Role of Environment Deposits and Operating Surface Temperature in Spallation of Air Plasma Sprayed Thermal Barrier Coatings
    Borom, MP; Johnson, CA; Peluso, LA
  • Phase Diagram of the ZrO2-Gd2O3-Al2O3 System
    Lakiza, S; Fabrichnaya, O; Wang, C; Zinkevich, M; Aldinger, F
  • Infiltration-Inhibiting Reaction of Gadolinium Zirconate Thermal Barrier Coatings with CMAS Melts
    Krämer, S; Yang, J; Levi, CG
  • Composition Effects of Thermal Barrier Coating Ceramics on Their Interaction with Molten Ca-Mg-Al-silicate (CMAS) Glass
    Drexler, JM; Ortiz, AL; Padture, NP
  • Environmental Degradation of Thermal-Barrier Coatings by Molten Deposits
    Levi, CG; Hutchinson, JW; Vidal-Sétif, M-H; Johnson, CA
  • Mitigation of Damage from Molten Fly Ash to Air-Plasma-Sprayed Thermal Barrier Coatings
    Gledhill, AD; Reddy, KM; Drexler, JM; Shinoda, K; Sampath, S; Padture, NP
  • Plasma Sprayed Gadolinium Zirconate Thermal Barrier Coatings That Are Resistant to Damage by Molten Ca-Mg-Al-silicate Glass
    Drexler, JM; Chen, C-H; Gledhill, AD; Shinoda, K; Sampath, S; Padture, NP
  • Jet Engine Coatings for Resisting Volcanic Ash Damage
    Drexler, JM; Gledhill, AD; Shinoda, K; Vasiliev, AL; Reddy, KM; Sampath, S; Padture, NP
  • Tailoring the EB-PVD Columnar Microstructure to Mitigate the Infiltration of CMAS in 7YSZ Thermal Barrier Coatings
    Naraparaju, R; Hüttermann, M; Schulz, U; Mechnich, P
  • CMAS Behavior of Yttrium Aluminum Garnet (YAG) and Yttria-Stabilized Zirconia (YSZ) Thermal Barrier Coatings
    Kumar, R; Jordan, EH; Gell, M; Roth, J; Jiang, C; Wang, J; Rommel, S
  • Influence of Microstructure on the Durability of Gadolinium Zirconate Thermal Barrier Coatings Using APS & SPPS Processes
    Kumar, R; Cietek, D; Jiang, C; Roth, J; Gell, M; Jordan, EH
  • CMAS Corrosion of EB PVD TBCs: Identifying the Minimum Level to Initiate Damage
    Wellman, R; Whitman, G; Nicholls, JR
  • Viscosity of Magmatic Liquids: A Model
    Giordano, D; Russell, JK; Dingwell, DB
  • Air-Plasma-Sprayed Thermal Barrier Coatings That Are Resistant to High-Temperature Attack by Glassy Deposits
    Drexler, JM; Shinoda, K; Ortiz, AL; Li, D; Vasiliev, AL; Gledhill, AD; Sampath, S; Padture, NP
  • Lifetime and Failure Modes of Plasma Sprayed Thermal Barrier Coatings in Thermal Gradient Rig Tests with Simultaneous CMAS Injection
    Mack, DE; Wobst, T; Jarligo, MOD; Sebold, D; Vaßen, R
  • Optical Basicity: A Practical Acid-Base Theory for Oxides and Oxyanions
    Duffy, JA
  • 2ZrO2·Y2O3 Thermal Barrier Coatings Resistant to Degradation by Molten CMAS: Part I, Optical Basicity Considerations and Processing
    Krause, AR; Senturk, BS; Garces, HF; Dwivedi, G; Ortiz, AL; Sampath, S; Padture, NP
  • 2ZrO2·Y2O3 Thermal Barrier Coatings Resistant to Degradation by Molten CMAS: Part II, Interactions with Sand and Fly Ash
    Krause, AR; Garces, HF; Senturk, BS; Padture, NP