A diffusion model for tungsten powder carburization |
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Authors: | Lewis V. McCarty Richard Donelson 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. |
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