In the present study, the adhesion and thermal characteristics of a new high temperature coating are evaluated. The new Korolon™ 1350A is applied by a conventional spray gun process at room temperature and does not require a bond coat when applied to Ni-based alloys. The coating thickness was varied from 127 to 254 μm. The coating/substrate adhesion was evaluated using a conventional bend test that subjects the coating to large elastic/plastic deformations. The coating showed no sign of delamination or fracture when subjected to 180° bend. Bend testing was also conducted following thermal cycling (95 to 815 °C) of the specimens in air. The coating showed no sign of oxidative degradation or delamination in bend testing. The thermal characteristics of the coating were evaluated under both convective and conductive heating conditions, including a guarded hot plate apparatus. After extensive testing and measurement of differential temperatures across the test specimens, it was estimated that the thermal conductivity of the coating is approximately 1 W/m K. The coating was then applied to aerothrottle panels and tested in a ramjet simulation test facility with flowing hot air at 1,200 °C. During this experiment the surface temperature on the coated panels reached 720 °C. Examination of the panels subsequent to testing showed no sign of degradation. Consistent with bench testing, a maximum temperature difference of 316 °C was measured between the heated surface and the back face with the coating applied to the heated surface. The results confirmed that the new coating is promising for elevated temperature use as a thermal barrier coating.
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ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
June 11–15, 2012
Copenhagen, Denmark
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4471-7
PROCEEDINGS PAPER
Evaluation of a New Coating for Application to Ramjet Engine Combustion Chamber Available to Purchase
Hooshang Heshmat,
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
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James F. Walton, III,
James F. Walton, III
Mohawk Innovative Technology, Inc., Albany, NY
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Said Jahanmir
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
Search for other works by this author on:
Hooshang Heshmat
Mohawk Innovative Technology, Inc., Albany, NY
James F. Walton, III
Mohawk Innovative Technology, Inc., Albany, NY
Said Jahanmir
Mohawk Innovative Technology, Inc., Albany, NY
Paper No:
GT2012-68725, pp. 641-649; 9 pages
Published Online:
July 9, 2013
Citation
Heshmat, H, Walton, JF, III, & Jahanmir, S. "Evaluation of a New Coating for Application to Ramjet Engine Combustion Chamber." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 5: Manufacturing Materials and Metallurgy; Marine; Microturbines and Small Turbomachinery; Supercritical CO2 Power Cycles. Copenhagen, Denmark. June 11–15, 2012. pp. 641-649. ASME. https://doi.org/10.1115/GT2012-68725
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