Novel temperature sensors for SiC–SiC CMC engine components

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 a...

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Bibliographic Details
Published inJournal of materials research Vol. 32; no. 17; pp. 3319 - 3325
Main Authors Rivera, Kevin, Muth, Tommy, Rhoat, John, Ricci, Matt, Gregory, Otto J.
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 01.09.2017
Springer International Publishing
Springer Nature B.V
Subjects
Applied and Technical Physics
Biomaterials
Boron
Ceramic matrix composites
Engine components
Fiber orientation
Gas flow
Gas turbine engines
High temperature
Inorganic Chemistry
Invited Article
Invited Articles
Materials Engineering
Materials research
Materials Science
Nanotechnology
Oxidation
Palladium
Platinum
Sensors
Silicon
Silicon carbide
Surface temperature
Temperature measurement
Temperature sensors
Thermocouples
Thermoelectricity
Thin films
United States > US
thin film
composite
thermoelectric
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2017.216