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Microscopic observations of hard carbon heat-treated under pressure

✍ Scribed by K. Kamiya; M. Inagaki; T. Noda

Publisher: Elsevier Science
Year: 1971
Tongue: English
Weight: 386 KB
Volume: 9
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(71)90047-9

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✦ Synopsis

The two hard carbons PH-7, a phenolformaldehyde resin char carbonized to 700°C and PH-15, which was the same PH-7 heat-treated for 60min at 1500°C under reduced pressure, were heat-treated at various temperatures under pressure of 5 kbar and examined using a polarized light microscope. Bright golden-yellow areas with birefringence are observed at contacts between angular grains and these areas increase with the increase in HTT. The percentage increase in these optically anisotropic areas corresponds to the increase in the content of the graphitic component as determined by X-rays. The results show that large strains due to the concentration of the compressive stress at the contacts of the grains causes graphitization of hard carbons.

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