In this study two variations of Air plasma spray (APS) coated Inconel738 (IN738) materials are evaluated for their thermal cycling and spalling behavior as well as thermo-physical properties variations as a function of temperature. The emphasis in this study was to investigate two different processing regimes that yield a standard APS and vertically oriented columnar microstructures in terms of their thermomechanical performance. The thermal cycling studies involved ramping the samples from 25°C to a temperature of about 1125°C in duration of 30 minutes, and followed by maintaining the samples at that temperature for 5 hours, followed by cooling down from 1125°C to 25°C for 30 minutes. The thermal properties measurements involved using Laser Flash method to measure thermal diffusivity and thermal conductivity from 100°C to 900°C. A thermal stress analytical study was also conducted in order to draw inference in the above studies as to the plausible causes of failure in the samples. Preliminary results of this thermal cycling and thermo-physical properties study are presented in this paper. The results are being correlated with the stress analysis results.
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ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
August 10–14, 2008
Jacksonville, Florida, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4847-0
PROCEEDINGS PAPER
Performance of Vertical Cracked Air Plasma Spray Processed Thermal Barrier Coatings: Thermo-Physical Properties Measurements, and Effects of Thermal Stress on Thermal Cycling Failure
Patrick F. Mensah,
Patrick F. Mensah
Southern University and A&M College, Baton Rouge, LA
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Nalini Uppu,
Nalini Uppu
Southern University and A&M College, Baton Rouge, LA
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Ravinder Diwan
Ravinder Diwan
Southern University and A&M College, Baton Rouge, LA
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Patrick F. Mensah
Southern University and A&M College, Baton Rouge, LA
Nalini Uppu
Southern University and A&M College, Baton Rouge, LA
Ravinder Diwan
Southern University and A&M College, Baton Rouge, LA
Paper No:
HT2008-56354, pp. 677-684; 8 pages
Published Online:
July 7, 2009
Citation
Mensah, PF, Uppu, N, & Diwan, R. "Performance of Vertical Cracked Air Plasma Spray Processed Thermal Barrier Coatings: Thermo-Physical Properties Measurements, and Effects of Thermal Stress on Thermal Cycling Failure." Proceedings of the ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. Heat Transfer: Volume 1. Jacksonville, Florida, USA. August 10–14, 2008. pp. 677-684. ASME. https://doi.org/10.1115/HT2008-56354
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