Research and Development on Advanced Graphite Materials. Volume 24 - The Thermal Expansion of Graphite in the C Sub O-Direction
NATIONAL CARBON CO INC CLEVELAND OH
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The thermal expansions of lampblack base, coke base, hot worked coke base and pyrolytic graphites have been measured in the c sub o 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 a sub os and c sub os 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 a sub o expansion coefficient near 298 K.
- Geology, Geochemistry and Mineralogy