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Correlation of Measured Thermal Conductivity to a Functionally Graded Material's Microstructure

Published online by Cambridge University Press:  02 July 2020

John Phelps ,
Andrew Slifka  and
James Filla
John Phelps
Affiliation:
National Institute of Standards and Technology, Materials Reliability Division, Boulder, Colorado80303
Andrew Slifka
Affiliation:
National Institute of Standards and Technology, Materials Reliability Division, Boulder, Colorado80303
James Filla
Affiliation:
National Institute of Standards and Technology, Materials Reliability Division, Boulder, Colorado80303
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Extract

Functionally Graded Materials (FGMs) are used in a number of applications as a protective barrier to extreme environments. One such application of FGMs is to protect metal parts from high temperature environments. FGM coatings are plasma spray deposited onto surfaces of both simple and complex machined parts. Knowing the thermal conductivity of the FGM coating allows engineers to effectively develop high temperature designs with accurate estimates of heat transfer and thermal loading.

In this study, a FGM made by Caterpillar, USA, was measured with our steady state thermal conductivity measurement apparatus. The sample measured is a 10 layer graded coating using a Metro* 461 bond coan4 to a Metco* 205 ceria-yittria stabilized zirconia, with a Ni-Co-Cr-Al-Y metal grading. Figure 1 shows a plot of the thermal conductivity (W/m*K) as a function of temperature (K) for this material. The sudden drop in thermal conductivity at approximately 1073K was totally unexpected

Type
Oxidation, Corrosion, and Protective Coatings
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 789 - 790
Copyright
Copyright © Microscopy Society of America 1997

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References

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