Activation energies for creep of pyrolytic and glassy carbon
Activation energies for creep of pyrolytic and glassy carbon
IN an investigation of the high temperature (2,500° to 2,900° C) creep behaviour of glassy (vitreous) carbon, Fischbach1 obtained apparent activation energies for creep in the range 306 to 382 kcalories mol−1. These values are unexpectedly high for a non-graphitizing carbon with a disordered structure, especially when compared with the activation energies of 250 and 260 kcalories mol−1 reported earlier for pyrolytic carbon for creep2,3 and graphitization4, respectively. It is therefore appropriate to examine whether an important contribution to the activation energy may arise through the temperature dependence of the shear modulus5,6.
60-60
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
27 March 1972
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Langdon, Terence G.
(1972)
Activation energies for creep of pyrolytic and glassy carbon.
Nature Physical Science, 236, .
(doi:10.1038/physci236060a0).
Abstract
IN an investigation of the high temperature (2,500° to 2,900° C) creep behaviour of glassy (vitreous) carbon, Fischbach1 obtained apparent activation energies for creep in the range 306 to 382 kcalories mol−1. These values are unexpectedly high for a non-graphitizing carbon with a disordered structure, especially when compared with the activation energies of 250 and 260 kcalories mol−1 reported earlier for pyrolytic carbon for creep2,3 and graphitization4, respectively. It is therefore appropriate to examine whether an important contribution to the activation energy may arise through the temperature dependence of the shear modulus5,6.
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Accepted/In Press date: 1972
Published date: 27 March 1972
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Local EPrints ID: 489071
URI: http://eprints.soton.ac.uk/id/eprint/489071
PURE UUID: f85051d7-8b93-42aa-a7fb-9443d0538196
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Date deposited: 12 Apr 2024 16:32
Last modified: 13 Apr 2024 01:38
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