Abstract
In this work, the viability of the plasma use is demonstrated for the oil removal of metallic pieces sintered at 850°C, compacted at 250, 450 and 600 MPa. The sintered samples of pure iron, stored in oil, were treated in an abnormal glow gas mixture discharge of Ar and H 2 . The electric discharge was generated in a confined anode-cathode configuration, with the samples placed on the anode. The samples were characterized by measures of mass loss, optical microscopy and X-ray diffractometry. The results show that a H 2 discharge at a pressure of 267 Pa for 600 seconds is sufficient to remove the oil from sintered metallic pieces, maintaining temperature at 200°C for pieces compacted at 250 MPa, at 250°C for pieces compacted at 450 MPa and at 300°C for pieces compacted at 600 MPa. Confirming these results, the samples treated under these conditions were submitted to nitriding treatment in the confined cathode-anode configuration and they presented similar results to the ones obtained for samples not stored in oil.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have