Advanced thermal barrier coatings (TBCs) with lower thermal conductivity, increased resistance to calcium-magnesium-aluminosilicate (CMAS), and improved high-temperature capability, compared to traditional yttria-stabilized zirconia (YSZ) TBCs, are essential to higher efficiency in next generation gas turbine engines. Double-layer rare-earth zirconate/YSZ TBCs are a promising solution. From a processing perspective, solution precursor plasma spray (SPPS) process with its unique and beneficial microstructural features can be an effective approach to obtaining the double-layer microstructure. Previously durable low-thermal-conductivity YSZ TBCs with optimized layered porosity, called the inter-pass boundaries (IPBs) were produced using the SPPS process. In this study, an SPPS gadolinium zirconate (GZO) protective surface layer was successfully added. These SPPS double-layer TBCs not only retained good cyclic durability and low thermal conductivity, but also demonstrated favorable phase stability and increased surface temperature capabilities. The CMAS resistance was evaluated with both accumulative and single applications of simulated CMAS in isothermal furnaces. The double-layer YSZ/GZO exhibited dramatic improvement in the single application, but not in the continuous one. In addition, to explore their potential application in integrated gasification combined cycle environments, double-layer TBCs were tested under high-temperature humidity and encouraging performance was recorded.
机构:
Glenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USAGlenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USA
Bansal, Narottam P.
;
Zhu, Dongming
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机构:
Glenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USAGlenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USA
机构:
Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA
Clarke, DR
;
Levi, CG
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机构:
Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA
机构:
Glenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USAGlenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USA
Bansal, Narottam P.
;
Zhu, Dongming
论文数: 0引用数: 0
h-index: 0
机构:
Glenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USAGlenn Res Ctr, US Army Lab, Vehicle Technol Directorate, Cleveland, OH 44135 USA
机构:
Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA
Clarke, DR
;
Levi, CG
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA