In order to meet the requirement of temperature measurement in cooled turbines, it is desirable to develop surface-mounted thin-film thermocouples or a resistance thermometer. In the current state of the art of thin-film thermocouples, the sensing element consists of 2-mum-thick Pt and Pt 10% Rh thin-film elements deposited on the insulating surface of the blades and vanes. The insulator is developed by thermal oxidation of a MCrAlY coating which is deposited on the blade and vane surface in the current state of turbine technology. The understanding of the structural and thermoelectric stability of the sensor elements and of the insulating layer of Al2O3 in the hostile environment of a gas turbine requires an in-depth study of the metallurgical reactions occurring at the thin-film Al2O3 and Al2O3-MCrAlY interfaces and of the corrosive reactions on the surface of the metal film. The desired quality Al2O3 has been grown on NiCoCrAlY-coated nickel-based superalloy substrates by a combination of oxidation treatments. The interface-modified Pt and Pt/Rh films are deposited on the oxide by a DC magnetron sputtering technique. The corrosion protection requirements involve deposition of Si-O-N and Si3N4 graded structures on the sensors by the plasma-assisted chemical vapor deposition process. Details of the electrical and metallurgical characteristics of the device at each stage of the coating/film growth have been analyzed by a number of surface sensitive and bulk analytical techniques.


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    Title :

    Thin-film temperature sensors for gas turbine engines: problems and prospects


    Additional title:

    Duennfilm-Temperatursensoren fuer Gasturbinen in der Luftfahrttechnik: Probleme und Zukunftsaussichten


    Contributors:
    Budhani, R.C. (author) / Prakash, S. (author) / Bunshah, R.F. (author)


    Publication date :

    1986


    Size :

    9 Seiten, 31 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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