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Title: Boron nitride insulating material

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.

Inventors:
 [1];  [2];  [3];  [4]
  1. (Oak Ridge, TN)
  2. Knoxville, TN
  3. Concord, TN
  4. Clearwater, FL
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863153
Patent Number(s):
4106186
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01C - RESISTORS
G - PHYSICS G21 - NUCLEAR PHYSICS G21C - NUCLEAR REACTORS
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
boron; nitride; insulating; material; temperature; bn-insulated; heaters; fuel; simulators; reactor; thermal; hydraulic; facility; studies; comprise; cylindrical; housing; concentric; heating; element; disposed; spaced; apart; define; annular; region; therebetween; contains; bn; providing; electrical; resistance; conductivity; fabrication; method; comprises; steps; cold; pressing; powder; pressure; 20; 80; 000; psig; dwell; time; 1-3; provide; hollow; preforms; suitable; dimensions; insertion; tap; density; 6-1; cm; orientation; ratio; 100; inserted; crushed; cold pressing; dwell time; fabrication method; hollow cylindrical; cylindrical housing; heating element; insulating material; thermal conductivity; boron nitride; spaced apart; electrical resistance; annular region; providing electrical; element disposed; reactor thermal; thermal hydraulic; temperature bn; /29/219/264/338/

Citation Formats

Morgan, Jr., Chester S., Cavin, O Burl, McCulloch, Reginald W, and Clark, David L. Boron nitride insulating material. United States: N. p., 1978. Web.
Morgan, Jr., Chester S., Cavin, O Burl, McCulloch, Reginald W, & Clark, David L. Boron nitride insulating material. United States.
Morgan, Jr., Chester S., Cavin, O Burl, McCulloch, Reginald W, and Clark, David L. Sun . "Boron nitride insulating material". United States. https://www.osti.gov/servlets/purl/863153.
@article{osti_863153,
title = {Boron nitride insulating material},
author = {Morgan, Jr., Chester S. and Cavin, O Burl and McCulloch, Reginald W and Clark, David L},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1978},
month = {1}
}

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