Highly stable, sheathed, beryllia insulated, tungsten--rhenium alloy thermocouples
- eds.
The fabrication and performance testing of 1.6 mm diameter tantalum sheathed, beryllium oxide (BeO) insulated, W-3 percent Re/W-25 percent Re thermocouples are reported. Fully assembled thermocouples constructed from aged thermoelements, specially heat treated, sintered BeO insulators, and specially cleaned and etched tantalum sheaths were tested for 2059 h at 1800$sup 0$C in a helium environment. The measured thermal emf drifts were less than the equivalent of 1$sup 0$C per thousand hours of exposure at 1800$sup 0$C. No gross chemical attack or degradation of the component materials was evident. The fabrication techniques, thermal emf test results, and post-test analyses of the component materials are discussed. (auth)
- Research Organization:
- National Bureau of Standards, Washington, DC; Commission of the European Communities, Petten (Netherlands). Joint Nuclear Research Center; UKAEA Research Group, Harwell. Atomic Energy Research Establishment
- NSA Number:
- NSA-33-022520
- OSTI ID:
- 4060225
- Report Number(s):
- EUR--5395(Vol.1); CONF-741226--P1
- Country of Publication:
- CEC
- Language:
- English
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