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Novel Environmental Barrier Coatings for Resistance Against Degradation by Molten Glassy Deposits in the Presence of Water Vapor

Toohey, Caitlin Maureen
http://rave.ohiolink.edu/etdc/view?acc_num=osu1313431765

Abstract Details

2011, Master of Science, Ohio State University, Materials Science and Engineering.
Environmental barrier coatings (EBCs) are used to prevent oxidation of underlying ceramic-matrix composite (CMC) structural components in aircraft gas-turbine engines. As operating temperatures increase, ingested airborne sand poses a serious threat to the stability of these coatings, because the sand adheres to the hot EBC surfaces and melts, forming calcium–magnesium–aluminosilicate (CMAS) glass. The reaction of EBCs with molten CMAS can lead to EBC delamination. Additionally, the interaction of water vapor with the CMAS–reacted EBCs can result in the formation of undesirable phases. Yb2Si2O7 has been identified as a promising EBC ceramic, based on its desirable properties: phase stability up to 1600°C, low thermal expansion coefficient mismatch with common CMCs, and potential resistance against degradation by CMAS and water vapor. As–sintered Yb2Si2O7 and CMAS–coated Yb2Si2O7 are tested in an air environment and in a water vapor environment, at a temperature of 1300°C in both cases. The behavior of these ceramics is compared to that of reference materials. Results from oxidation and chemical stability studies and analyses are presented.
Nitin P. Padture, PhD (Advisor)
Rudolph G. Buchheit, PhD (Committee Member)
44 p.
Materials Science
environmental barrier coating; EBC; Yb2Si2O7; ytterbium disilicate; CMAS; water vapor corrosion

Recommended Citations

Citations

  • Toohey, C. M. (2011). Novel Environmental Barrier Coatings for Resistance Against Degradation by Molten Glassy Deposits in the Presence of Water Vapor [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313431765

    APA Style (7th edition)

  • Toohey, Caitlin. Novel Environmental Barrier Coatings for Resistance Against Degradation by Molten Glassy Deposits in the Presence of Water Vapor. 2011. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1313431765.

    MLA Style (8th edition)

  • Toohey, Caitlin. "Novel Environmental Barrier Coatings for Resistance Against Degradation by Molten Glassy Deposits in the Presence of Water Vapor." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313431765

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.