Crystalline structure of boron nitride produced by the carbothermic method
The use of graphite boron nitride (GBN) for the synthesis of superhard BN modification presents specific requirements for a degree of perfection of its crystalline structure. In this study the effect of technical parameters of the carbothermic process on the crystalline structure on GBN was investigated. The starting mixture, consisting of chemically pure boric acid and technical carbon P-803, was dehydrated in a muffle furnace at a temperature in excess of 1000/sup 0/K. The obtained sintered mass was ground in a ball mill and was nitrided in a Tamman laboratory furnace in a stream of nitrogen purified from oxygen and moisture. x-Ray-diffraction investigations of the synthesized GBN were done on DRON-3 diffractometer with CuK/sub ..cap alpha../ emission. One of the more important characteristics of the GBN structure perfection was the degree of its three-dimensional orderliness P/sub 3/ determined by the relationship of the number of layers in the Bragg scattering region (BSR), directed as a rule relatively close, to the adjacent total number of layers in the BSR.
- Research Organization:
- Leningrad Technological Institute (USSR)
- OSTI ID:
- 5102426
- Journal Information:
- Sov. Powder Metall. Met. Ceram. (Engl. Transl.); (United States), Vol. 26:5(293); Other Information: Translated from Porshk. Metall. (Kiev.); 26: No. 5(293), 82-84(May 1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON NITRIDES
CRYSTAL LATTICES
GRAPHITE
BRAGG REFLECTION
CRYSTAL-PHASE TRANSFORMATIONS
HEAT TREATMENTS
LATTICE PARAMETERS
LINE WIDTHS
ORDER PARAMETERS
SINTERING
TEMPERATURE EFFECTS
VAN DER WAALS FORCES
X-RAY DIFFRACTION
BORON COMPOUNDS
CARBON
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTAL MINERALS
ELEMENTS
FABRICATION
MINERALS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PHASE TRANSFORMATIONS
PNICTIDES
REFLECTION
SCATTERING
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies