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Pore growth kinetics in heat-treated glass-like carbonsa)

Published online by Cambridge University Press:  31 January 2011

Jalil Lachter ,
Leo G. Henry ,
Robert H. Bragg  and
Stephen Spooner
Jalil Lachter
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Hearst Mining Building, University of California, Berkeley, California 94720
Leo G. Henry
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Hearst Mining Building, University of California, Berkeley, California 94720
Robert H. Bragg
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, Hearst Mining Building, University of California, Berkeley, California 94720
Stephen Spooner
Affiliation:
National Center for Small Angle Scattering Research, Oak Ridge National Laboratory, Oak Ridge, Tennessee 34830
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Abstract

The kinetics of changes in void size during annealing of glass-like carbons in the temperature range 1000°−2800 °C for times up to 150 h were studied using small-angle x-ray scattering determinations of the radius of gyration Rg. The results show that Rg ranged from 9 Å at 1000°C to about 24 Å at 2800 °C. A pore coarsening analysis and a superimposition kinetic analysis applied to Rg gave activation energies of 76 ± 4 kcal/mole and 74 ± 9 kcal/mole, respectively, which are associated with migration of vacancies within graphitic layers in the matrix material.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 6 , December 1986 , pp. 832 - 835
Copyright
Copyright © Materials Research Society 1986

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