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Research and Development on Advanced Graphite Materials: Volume VI - Creep of Carbons and Graphites in Flexure at High Temperatures

Report Number: WADD TR 61-72 Volume VI
Author(s): E. J. Seldin
Corporate Author: National Carbon Company
Laboratory: Directorate of Materials and Processes
Date of Publication: 1962-06
Pages: 40
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0284469

Abstract:
Flexure creep tests have been made on molded carbons and several types of graphites over the temperature range from 2200° to 3000°C. The amount of creep was found to decrease for a carbon as the temperature of graphitization increased and as the holding time at graphitization temperature increased for times up to four hours.

activation energies were determined for several standard an experimental grades of graphite from the steady state creep rates. The activation energies ranged from 23 to 92 kcal/mole and appeared to be constant for each graphite. The flexure experiments demonstrated a marked dependence of the creep on the grain orientation for the more anisotropic graphites. The grain orientation showing the highest room temperature strength shows the lowest high temperature creep. Some of the factors which influenced the creep behavior are density, crystallite size, and the size, type, and orientation of the particles.

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