Hafnia-Based Nanostructured Thermal Barrier Coatings for Advanced Hydrogen Turbine Technology

Technical Report · Sat Jun 01 04:00:00 EDT 2013

DOI:https://doi.org/10.2172/1132566· OSTI ID:1132566

Ramana, Chintalapalle ^[1]; Choudhuri, Ahsan ^[2]

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1. Univ. of Texas at El Paso, TX (United States); University Of Texas At El Paso
2. Univ. of Texas at El Paso, TX (United States)

Thermal barrier coatings (TBCs) are critical technologies for future gas turbine engines of advanced coal based power generation systems. TBCs protect engine components and allow further increase in engine temperatures for higher efficiency. In this work, nanostructured HfO₂-based coatings, namely Y₂O₃-stabilized HfO₂ (YSH), Gd₂O₃-stabilized HfO₂ (GSH) and Y₂O₃-stabilized ZrO₂-HfO₂ (YSZH) were investigated for potential TBC applications in hydrogen turbines. Experimental efforts are aimed at creating a fundamental understanding of these TBC materials. Nanostructured ceramic coatings of YSH, GSH and YSZH were grown by physical vapor deposition methods. The effects of processing parameters and ceramic composition on the microstructural evolution of YSH, GSH and YSZH nanostructured coatings was studied using combined X-ray diffraction (XRD) and Electron microscopy analyses. Efforts were directed to derive a detailed understanding of crystal-structure, morphology, and stability of the coatings. In addition, thermal conductivity as a function of composition in YSH, YSZH and GSH coatings was determined. Laboratory experiments using accelerated test environments were used to investigate the relative importance of various thermo-mechanical and thermo-chemical failure modes of TBCs. Effects of thermal cycling, oxidation and their complex interactions were evaluated using a syngas combustor rig.

• Research Organization: Univ. of Texas at El Paso, TX (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FE0000765
• OSTI ID: 1132566
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
36 MATERIALS SCIENCE
42 ENGINEERING