Abstract
AbstractA current intensive glow discharge, without auxiliary heating, has been used to study the carburization kinetics of 99.9% pure iron in the temperature range 950-11 OO°C. The treatments were all carried out at a total pressure of 1500 Pa in an atmosphere of methane and hydrogen, in the range 1-10% CH4. Spark emission spectrometry was used to generate the resultant carbon profiles. It has been found that the surface carbon concentration is a function of temperature, time and methane partial pressure. A t low partial pressures a limit has been found to the availability of active carburizing species from the plasma, and this is reflected in a low carburization rate. Some limitations on the method of processing are also discussed.
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