A diffusion model for tungsten powder carburization |
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Authors: | Lewis V McCarty Richard Donelson and Robert f Hehemann |
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Affiliation: | (1) retired from the Lamp Metals Laboratory of the General Electric Company, 44112 Cleveland, OH;(2) Advanced Materials Engineer with the Institute of Gas Technology, 60616 Chicago, IL |
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Abstract: | A mathematical model describes the carburization kinetics of tungsten powders mixed with carbon and heated in hydrogen. It
is based on diffusion of carbon through a shell of WC growing into particles which are modeled as spheres. The activation
energy is 58 kcal/mole in the temperature range 1056 to 1833 °C. Hydrogen gas is important to transport carbon as methane
or acetylene, but increased hydrogen pressure increases the rate of carburization so little that an adsorbed species such
as CH probably controls the carbon concentration at the particle surface.
Formerly with the Lamp Metals Laboratory, deceased, was Professor of Metallurgy at Case Western Reserve University Cleveland
OH. |
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