Accession Number : AD0763687

Title :   Microstructure of Graphite Fibers: A Preliminary Report.

Descriptive Note : Technical rept. 1 Apr 72-29 May 73,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Uhlmann,Donald R. ; Peebles,Leighton H. , Jr. ; Warner,Steven B.

Report Date : 29 MAY 1973

Pagination or Media Count : 16

Abstract : Graphite fibers can be prepared with different tensile strengths and moduli by altering the process conditions. Qualitative evidence of the structural differences can be observed in scanning electron micrographs of plasma etched fiber ends, but the detailed characteristics of the structures have not been determined. It has been established, however, that graphitic materials will adsorb selected materials such as potassium bromine, ferric chloride, and the like, to form intercalation compounds. The report describes efforts to study the kinetics and mechanism of formation of the intercalation compounds in graphite fibers which have different mechanical properties, and which have been subjected to a variety of processing treatments. Preliminary studies were also carried out using scanning electron microscopy and wide angle X-ray diffraction to elucidate the structural characteristics of the fibers which are presently available. A portion of the work was also concerned with the mechanism of oxidation of the original acrylic fiber. (Modified author abstract)

Descriptors :   (*CARBON FIBERS, MICROSTRUCTURE), MECHANICAL PROPERTIES, ELECTRON MICROSCOPY, X RAY DIFFRACTION, OXIDATION, PYROLYSIS, ACRYLIC RESINS, IMPURITIES

Subject Categories : Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE