Abstract
In situ experiments of a thermobalance in a reaction chamber for cold plasma activated carburizing together with mass spectroscopy allow for a determination of an overall carbon mass balance. This technique is applied to the carburizing of iron-base alloys under argon+methane atmospheres at low pressure. The major aspects of carbon balance have been established: • -for given fixed temperature and input flow-rate, the carbon transfer into the sample during the treatment takes place at constant carbon flow-rate; • -the output flow-rate of methane essentially depends on the total input flow-rate; • -the effective carbon transfer rate for carburizing is equal to the product of the CH 4 input flow-rate and the glow discharge induced reaction efficiency. Carbon is transferred both to the specimen and to the reactor walls. There is no flow-rate corresponding to carbon accumulation in the plasma. The net transfer towards the sample is given as a function of operation temperature and input flow-rate.
Published Version
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