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Novel temperature sensors for SiC–SiC CMC engine components

Published online by Cambridge University Press:  09 June 2017

Kevin Rivera Open the ORCID record for Kevin Rivera [Opens in a new window] ,
Tommy Muth ,
John Rhoat ,
Matt Ricci  and
Otto J. Gregory
Kevin Rivera*
Affiliation:
Department of Chemical Engineering, Sensors and Surface Technology Partnership, University of Rhode Island, Kingston 02881, Rhode Island, USA
Tommy Muth
Affiliation:
Department of Chemical Engineering, Sensors and Surface Technology Partnership, University of Rhode Island, Kingston 02881, Rhode Island, USA
John Rhoat
Affiliation:
Department of Chemical Engineering, Sensors and Surface Technology Partnership, University of Rhode Island, Kingston 02881, Rhode Island, USA
Matt Ricci
Affiliation:
Department of Chemical Engineering, Sensors and Surface Technology Partnership, University of Rhode Island, Kingston 02881, Rhode Island, USA
Otto J. Gregory*
Affiliation:
Department of Chemical Engineering, Sensors and Surface Technology Partnership, University of Rhode Island, Kingston 02881, Rhode Island, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

As more and more SiC–SiC ceramic matrix composites or CMC’s are being used in the hot sections of gas turbine engines, there is a greater need for surface temperature measurement in these harsh conditions. Thin film sensors are ideally suited for this task since they have very small thermal masses and are nonintrusive due to their thickness. However, if the bulk properties of SiC contributed to the sensor performance (thermoelectric response) rather than those of the thin films, superior resolution, and stability could be realized. Therefore, thermocouples utilizing the SiC–SiC CMC itself as one thermoelement and thin film platinum as the other thermoelement were developed. Large and stable thermoelectric powers (as large as 250 μV/°K) were realized with these Pt:SiC (CMC) thermocouples. The advantages in using this approach for surface temperature measurement are presented as well as the effects of fiber orientation on thermoelectric response and drift.

Keywords

compositethin filmthermoelectric
Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 17: Focus Issue: Achieving Superior Ceramics and Coating Properties through Innovative Processing , 14 September 2017 , pp. 3319 - 3325
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Eugene Medvedovski

References

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