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Effect of Boron on Polytype Phase Transformation Occurring During Sintering of Si-C-B Powders Obtained By Combustion (SHS)
Published online by Cambridge University Press: 10 February 2011
Abstract
Silicon carbide powders were synthesized by SHS method with boron added in various quantities as either amorphous elemental or boric acid additive. The powder samples were then heat treated at a selected temperature (up to 22000°C). Crystallographic structure of the powders were analyzed by means of X-ray powder diffraction technique. It was found that boron added in the form of H3BO3 tends to precipitate in the form of small clusters and does not dissolve evenly in the SiC lattice. Upon annealing the boron clusters dissociate. The boron atoms diffusing across the SiC lattice generate a large number of stacking faults with simultaneous transformation of hexagonal polytype 6H (α-phase) present in as-synthesized powders into the cubic 3C (βphase) modification.
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- Copyright © Materials Research Society 1996