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Research And Development On Advanced Graphite Materials. Volume XVIII - High Temperature Tensile Creep Of Graphite

Report Number: WADD TR 61-72 Volume 18
Author: Seldin, E. J.
Corporate Author: Research Laboratory of National Carbon Company Division of Union Carbide Corporation
Laboratory: AF Materials Laboratory
Date of Publication: 1964-03
Pages: 44
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0435679

Tensile creep tests under conditions of constant load and constant temperature were performed on four different types of graphite. The temperature ranged from 2300° to 2900°C. Some of the data were fitted to creep equations and the temperature and stress dependence of the steady-state creep rates were investigated. For National Carbon Company grade ATJ graphite, the creep rates yielded an activation energy of 124 Kcal/mole and varied with the fourth power of the stress for specimens with two different grain orientations. The activation energy was found to be the same for all the other graphites which were tested. The creep was found to be greater in the direction "against the grain" than in the direction "with the grain," and differences in creep strain and creep rate for the two orientations were found to increase as the anisotropy of the graphite was increased. For one type of graphite, the creep of specimens oriented ''with the grain'' decreased as the density increased and was not sensitive to differences in the proportions of filler and binder carbon.

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