Effective spectral emissivity measurements of superalloys and YSZ thermal barrier coating at high temperatures using a 1.6μm single wavelength pyrometer |
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Authors: | Sami Alaruri Lisa Bianchini Andrew Brewington |
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Affiliation: | Allison Engine Company, Rolls Royce Aerospace Group, Box 420, M/S W03A, Indianapolis, IN 46206-0420, USA |
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Abstract: | A method which employs an integrating sphere and a single-wavelength (1.6 μm) pyrometer for measuring the spectral effective emissivities of superalloys in the temperature range (=650–1050°C) is described. The spectral effective emissivities for five superalloys, namely, MARM-247, MARM-509, CMSX-4, Inconel-718, N-155 and two René-N6 samples coated with YSZ thermal barrier coating were measured. Correcting the pyrometer measurements for the variations in the object emissivity would reduce the uncertainty in the temperature measurements to <±1%. |
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Keywords: | Light emission Superalloys Thermal insulating materials Temperature measurement Pyrometers Thermal barrier coatings |
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