Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1994-03-02
1996-05-28
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
374144, 374208, 136232, G01K 704, G01K 110
Patent
active
055204619
ABSTRACT:
A metallic thermocouple probe is capable of withstanding temperatures in excess of 1650.degree. C. in oxidizing environments. First and second electrically conductive leads of dissimilar metals are joined at an extreme sensing end and extend to a distant readout device. Metal oxide insulation such as beryllium oxide, magnesium oxide, and aluminum oxide, electrically isolates the conductive leads and thermally isolates them from the environment. The extreme sensing end of the thermocouple probe is encapsulated to render it impermeable to the formation of oxides thereon. This encapsulation includes a protective coating composed of a non-porous ceramic material, preferably a cementation applied disilicide. Additionally, a high temperature structural sheath overlies the insulation adjacent the extreme sensing end and a low temperature sheath overlies the insulation adjacent the first sheath distant from the extreme sensing end. The first and second sheaths abut at a sheath junction and a splice cover overlies the sheath junction and is attached to the first and second sheaths. The first sheath is composed of a refractory metal such as tungsten, tantalum, molybdenum, columbium-zirconium, or their alloys; the second sheath is composed of a material such as stainless steel, INCONEL brand alloys, or glass woven into an overbraid; and the splice cover is composed of a metal such as stainless steel or inconel.
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Curry Stephen J.
Mastanduno Richard T.
Allied-Signal Inc.
Gutierrez Diego F. F.
McFarland James W.
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