Accession Number : ADA019437

Title :   Crystalline Structure of Pyrocarbon Film Deposited on Pyrolytic Boron Nitride.

Descriptive Note : Interim technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF MATERIALS SCIENCES LAB

Personal Author(s) : Wachi,Francis M. ; Whittaker,Arthur G. ; Watts,Ethel J.

Report Date : 04 DEC 1975

Pagination or Media Count : 14

Abstract : Transmission electron diffraction data have indicated that the pyrocarbon films deposited on pyrolytic boron nitride consist of a mixture of crystalline and amorphous carbon phases. The crystalline structures appear to be of two allotropic modifications of carbon: graphite and carbyne. These carbyne crystals were produced during the deposition of pyrocarbon on pyrolytic boron nitride rods at a moderate temperature and pressure by the decomposition of methane.

Descriptors :   *BORON NITRIDES, *CARBON, *COATINGS, CRYSTAL STRUCTURE, ELECTRON MICROSCOPY, ELECTRON DIFFRACTION, AMORPHOUS MATERIALS, PYROLYTIC GRAPHITE, FILMS, METHANE, PYROLYSIS

Subject Categories : Ceramics, Refractories and Glass
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE