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Tensile creep behavior of glassy carbon

✍ Scribed by D.B. Fischbach

Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
938 KB
Volume
9
Category
Article
ISSN
0008-6223

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✦ Synopsis

l'he tensile creep behavior of glassy carbon has been investigated over the stress range 500-18,000 lb/' in2 and the temperature range 2500-2900Β°C f'or two grades ofJapanese glassy carbon, GC-20 and CC-30. Similar behavior was found for both grades. For GC-30, the reduction in cross-sectional area was nearly the constant-volume value; for (X-20 it was a little smaller. The creep rate, which decreased monotonically with elongation at constant load and temperature, could be represented hy the empirical expression E = ACT" exp (-&J/R?') where A is a function of the material and the strain. LJsing a stress-change technique combined with graphical analysis. it was found that )t = 1 +Htr. R = 3.i X 10 ' in'/lh; ;I similar temperature-change technique gave AH = 350 i 45 kcal/molc in the stl-ess range 6000-16,000 lb/k?. A least 25 per cent of the creep elongation was recoverable at temperature when the stress was reduced nearly to zero. These results are compared with those on other carbons and graphites, and some possible deformation mechanisms are discussed.

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