CHARACTERISTICS OF THE HIGH TEMPERATURE MECHANISM OF CREEP AND RECOVERY IN GRAPHITE.
Quarterly technical status rept. no. 1, 1 Aug31 Oct 63.
COLLEGE OF AERONAUTICS CRANFIELD (UNITED KINGDOM)
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Experimental material consisted of ground petroleum coke in a pitch binder with 10 ground artificial graphite added for ease of manufacture. The extruded rods were carbonised at 1200 C. Part of the batch was subsequently heattreated for 12 hour at 2500 C and is referred to as graphitised. Considerable difficulties were encountered in the experimental work on this material, mainly caused by longitudinal cracks in the rod. Some creep and recovery curves were obtained on apparently uncracked material and these are included. The usual trends in the creep behaviour can be noted these are 1 The amount of creep strain in a given time increases with temperature for the graphitised material. 2 Ungraphitised material tested above 2000 C has a high creep rate when compared to the graphitised material. On recovery from a constant creep strain of approximately 0.010, the temperature and the state of graphitisation do not appear to exert large effects. Author