Accession Number : ADA299415

Title :   Surface Studies of Carbon Fibers Related to their use in Carbon-Carbon Composites.

Descriptive Note : Final rept. 15 Jan 92-15 Jul 95,

Corporate Author : KANSAS STATE UNIV MANHATTAN DEPT OF CHEMISTRY

Personal Author(s) : Sherwood, Peter M.

PDF Url : ADA299415

Report Date : 30 AUG 1995

Pagination or Media Count : 11

Abstract : The surface chemistry and topography of carbon fiber surfaces have been probed using a variety of surface analytical tools in order to understand the processes that effect the oxidation of carbon-carbon composites. Core and Valence Band X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and other techniques were used to monitor the surface chemistry and topography of carbon fibers, with and without oxidation protective coatings. A special high vacuum apparatus was built to study surface oxidation at elevated temperatures in a chamber directly attached to a surface spectrometer. The valence band XPS spectra were interpreted by calculations that modelled the fiber surface and interfacial chemistry. The results of the project provide a better understanding of the inter facial chemistry associated with carbon fiber surface oxidation and protection. Protective films for the outer surface of the composite, and coupling agents that improve the oxidation resistance of the carbon fiber-carbon matrix interface are reported. jg p.1

Descriptors :   *CARBON CARBON COMPOSITES, *SURFACE CHEMISTRY, COUPLING(INTERACTION), SCANNING ELECTRON MICROSCOPES, INTERFACES, HIGH TEMPERATURE, X RAY DIFFRACTION, FILMS, CARBON FIBERS, TOPOGRAPHY, ELECTRON MICROSCOPY, SURFACES, CHEMISTRY, VALENCE BANDS, X RAY PHOTOELECTRON SPECTROSCOPY, MATHEMATICAL ANALYSIS, VACUUM APPARATUS, PROTECTIVE COATINGS, OXIDATION RESISTANCE, SPECTROMETERS, HIGH VACUUM.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE