Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-11-24
1978-08-15
White, Robert F.
Metal working
Method of mechanical manufacture
Electrical device making
219523, 219544, 264112, 264272, 264325, 338238, 338248, H01C 103
Patent
active
041061861
ABSTRACT:
High temperature BN-insulated heaters for use as fuel pin simulators in reactor thermal hydraulic test facility studies comprise a cylindrical housing and a concentric heating element disposed within the housing and spaced apart from the housing to define an annular region therebetween. The annular region contains BN for providing electrical resistance and thermal conductivity between the housing and the heating element. The fabrication method of this invention comprises the steps of cold pressing BN powder at a pressure of 20 to 80,000 psig and a dwell time of at least 0.1-3 seconds to provide hollow cylindrical preforms of suitable dimensions for insertion into the annular region, the BN powder having a tap density of about 0.6-1.1 g/cm.sup.3 and an orientation ratio of at least about 100/3.5. The preforms are inserted into the annular region and crushed in place.
REFERENCES:
patent: 3898431 (1975-08-01), House et al.
patent: 4001760 (1977-01-01), Howie et al.
Cavin O. Burl
Clark David L.
McCulloch Reginald W.
Morgan, Jr. Chester S.
Carlson Dean E.
Hamel Stephen D.
Parrish John A.
The United States of America as represented by the United States
Uzzell Allen H.
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