A feasibility study of plasma nitriding of steel with an oxide layer on the surface
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In a traditional DC plasma nitriding furnace, the component to be treated serves as the cathode and forms an integral part of the DC plasma system . It is, thus, an essential requirement that the component to be nitrided is clean and electrically conductive. Components with non-conducting materials such as an oxide layer, contamination of oil or lubricant, ink or paint marks on the surface cannot be directly plasma nitrided due to the risk of arcing and instability of the DC glow-discharge plasma. On the other hand, these non-conductive substances on whole or part a surface of an engineering component are almost unavoidable in industry. For example, oxidation of steel can occur during casting, forging and heat treatment. To facilitate plasma nitriding with the existing DC plasma technology, a component to be treated has to be ground or machined all over to remove the oxide layer before plasma nitriding treatment. This is in spite of the fact that in most cases only the working...
KeywordsOxide Layer Oxidise Sample Plasma Nitriding Iron Nitrides Friction Curve
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