THERMOELECTRIC CHARACTERISTICS OF HIGH-TEMPERATURE THERMOCOUPLES WITH REFRACTORY ELECTRODES (in Russian)
Two concentric tubes made of refractory materials are used in making a thermocouple. The external carbide, boride, nitride or silicide serves as a protective jacket and thermoelectrode simultaneously. These refractory thermocouples have a high thermal emf and a high temperature sensitivity amounting to 75 mu mu //sup 0/C. Thus, the TiC-C (2500 deg C) and ZrB/sub 2/-C (2000 deg C) thermocouples have similar characteristics, while a MoSi/sub 2/-WSi/ sub 2/ (1650 deg C) thermocouple has thermoelectric characteristics similar to platinum or platinumrhodium thermocouples (the temperatures in parenthesis give the upper measurement limits). The TiC-C thermocouple is used in vacuum or reducing atmospheres, the ZrB/sub 2/-C thermocouple in oxidizing atmospheres. The TiC-C couple operated greater than 200 hours at 2400 deg C without failure; the ZrB/sub 2/-C couple was immersed several hours in molten steel at 1700 deg C without visible sign of failure, and it is estimated that the disilicide thermocouple would last more than 100 hours in an oxidizing atmosphere. Baking at high temperatures stabilizes the behavior of the refractory thermocouples. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-028059
- OSTI ID:
- 4838686
- Journal Information:
- Izmeritel'naya Tekh, Journal Name: Izmeritel'naya Tekh Vol. Vol: No. 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
BORIDES
CARBIDES
CARBON
ELECTRIC POTENTIAL
ELECTRODES
FAILURES
HIGH TEMPERATURE
JACKETS
LIQUID METALS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NITRIDES
OXIDATION
PLATINUM
REDUCTION
REFRACTORIES
RHODIUM
SENSITIVITY
SILICIDES
STABILITY
STANDARDS
STEELS
THERMOCOUPLES
THERMOELECTRICITY
TITANIUM CARBIDES
TUBES
TUNGSTEN ALLOYS
VACUUM
ZIRCONIUM BORIDES