Electric heating – Heating devices – With heating unit structure
Patent
1980-07-14
1982-04-20
Gilden, Leon
Electric heating
Heating devices
With heating unit structure
29611, 219553, 338238, 338302, H05B 344
Patent
active
043261221
ABSTRACT:
The present invention is directed to an electric cartridge-type heater for use as a simulator for a nuclear fuel pin in reactor studies. The heater comprises an elongated cylindrical housing containing a longitudinally extending helically wound heating element with the heating element radially inwardly separated from the housing. Crushed cold-pressed preforms of boron nitride electrically insulate the heating element from the housing while providing good thermal conductivity. Crushed cold-pressed preforms of magnesia or a magnesia-15 percent boron nitride mixture are disposed in the cavity of the helical heating element. The coefficient of thermal expansion of the magnesia or the magnesia-boron nitride mixture is higher than that of the boron nitride disposed about the heating element for urging the boron nitride radially outwardly against the housing during elevated temperatures to assure adequate thermal contact between the housing and the boron nitride.
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Dial Ralph E.
McCulloch Reginald W.
Morgan, Jr. Chester S.
Besha Richard G.
Gilden Leon
Hamel Stephen D.
Larcher Earl L.
The United States of America as represented by the United States
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