Studies on pyrolytic carbons obtained by acetylene pyrolysis at 1273 K—II: Graphitization of various types of pyrolytic carbons

✍ Scribed by S. Jasieńko; J. Machnikowski

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 471 KB
• Volume: 19
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(81)90044-0

✦ Synopsis

A~~~-Various

types of pyrolytic carbons obtained by acetylene pyrolysis at 1273 K were heat treated for 0.5 hr at 1623, 1973,2323,2673 and 3273 K. These carbons showed distinctly different ~aphit~biiity, decreasing in the order: compact, feathery, brittle, spongy and soot-like carbon. On the grounds of X-ray examination (dm, L,, L.), four temperature ranges which show different trends in the development of structural ordering could be distinguished. A transitional decrease of helium density, which seemed to be associated with an increase of crystallite heights in the range of 20-35 nm. occurred on heat treatment of each of the carbons. The mechanism of graphitization appears to be similar to that of typical soft carbons and not to high temperature pyrolytic carbons.