Accession Number : AD0427185


Title :   Research and Development on Advanced Graphite Materials. Volume 24 - The Thermal Expansion of Graphite in the C Sub O-Direction


Descriptive Note : Technical rept.


Corporate Author : NATIONAL CARBON CO INC CLEVELAND OH


Personal Author(s) : Lowell, C E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/427185.pdf


Report Date : Nov 1963


Pagination or Media Count : 22


Abstract : 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 o's and c sub o'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 a sub o expansion coefficient near 298 K.


Descriptors :   *GRAPHITE , *PYROLYTIC GRAPHITE , CRYOGENICS , CRYSTAL LATTICES , HIGH TEMPERATURE , THERMAL EXPANSION , X RAY DIFFRACTION CAMERAS , X RAY PHOTOGRAPHY


Subject Categories : Geology, Geochemistry and Mineralogy


Distribution Statement : APPROVED FOR PUBLIC RELEASE