Carburization of iron by CO-based mixtures in nitrogen at 925 °C |
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Authors: | J H Kaspersma R H Shay |
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Affiliation: | (1) Air Products and Chemicals, Inc., 18105 Allentown, PA |
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Abstract: | The rates of carburization by mixtures of CO, CO2, H2 and H2O in N2 have been measured gravimetrically at 925 °. The rate equation which best describes the experimental data is based on a mechanism
which involves a rapid surface dissociation of CO into carbon and oxygen atoms, and a subsequent rate determining step between
this atomic oxygen and either CO or H2. The CO-H2 system carburizes much faster than CO alone, because H2 combines faster with atomic oxygen than does CO. The carburizing rate constant for CO-H2 is 44 times that for CO alone. The mechanism is confirmed by the additivity of the separate rates for the CO-H2 mixtures and for CO alone. |
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