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Plasma Dewaxing and Sintering of Compacted Unalloyed Iron

This work reports on the use of plasma technology in lubricant removal and sintering of compacted PM components. Unalloyed iron samples were treated in a hydrogen and argon discharge at a pressure of 400 Pa (3 Torr), varying the temperature and soaking time. The discharge was generated in a confined cathode-anode configuration with the sample placed on the anode. Samples were characterized by mass loss and the results were correlated with the plasma parameters. Approximately 80% of zinc stearate was removed using a H 2 discharge at 350 °C during 5 minutes reaching 93% as the time was increased to 30 minutes. After dewaxing, sintering was carried out with the sample placed on a support, which worked as the cathode of a 80% Ar + 20% H2 discharge at a pressure of 1330 Pa (10 Torr) for 30 minutes. Characterization of the sintered samples showed that plasma technology resulted in an efficient process.