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Research And Development On Advanced Graphite Materials. Volume XXIV - The Thermal Expansion Of Graphite In The Co-Direction

Report Number: WADD TR 61-72 Volume 24
Author(s): C. E. Lowell
Corporate Author: Research Laboratory of National Carbon Company Division of Union Carbide Corporation
Laboratory: AF Materials Laboratory
Date of Publication: 1963-11
Pages: 20
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0427185

Abstract:
The thermal expansions of lampblack base, coke base, hot worked coke base and pyrolytic graphites have been measured in the co direction from 1000° to 2700°K by use of a high temperature X-ray camera. The results indicate that, (a) the coefficient of thermal expansion is not constant with temperature and (b) this coefficient increases with increasing crystallite perfection. The camera was modified to accept a low temperature attachment and the ao's and co's of lampblack base, hot worked coke base, and pyrolytic graphite were evaluated at 6°, 78° and 298°K. The three graphites showed similar expansion characteristics and, within the limits of error, seemed to show a negative ao expansion coefficient near 298°K.

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