Aluminum substituted for rhodium, which is scarce and expensive. Electromotive force increases with aluminum content in Pt/Al leg of Pt(Pt/Al) thermocouple. Wires baked longer in aluminizing bed produce larger voltages. Thermocouples containing platinum/aluminum legs used instead of thermocouples of type R in furnaces, heat engines, and chemical reactors. Expecially suited to high-velocity oxidizing environments. Constructed as thin-film sensors on turbine blades and vanes, where pre-oxidation provides insulating film needed between thermocouple legs. Because aluminum content slowly depleted by oxidation, long-term use recommended only where maximum temperature is 1,200 degrees C or less.


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    Titel :

    High-Temperature, Oxidation-Resistant Thermocouples


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1994-09-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :




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    High-Temperature, Thin-Film Ceramic Thermocouples Developed

    Sayir, Ali / Blaha, Charles A. / Gonzalez, Jose M. | NTRS | 2005