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The plasma carburizing process is basically a low-pressure carburizing process making use of a high-voltage electrical field applied between the load to be treated and the furnace wall producing activated and ionized gas species responsible for carbon transfer to the workpieces. This article begins with an overview of the theoretical background and the range and limitations of glow-discharge plasma. It describes the plasma carburizing process, which is carried out with methane or propane. Plasma carburizing processes of sinter metals and stainless steels, and the influence of current pulse length on carbon input of low-pressure carburizing process are also described. The article presents the basic requirements and process parameters to be considered in plasma carburizing equipment. It also exemplifies a still-working plasma process in industrial measure.

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Brigitte Clausen, Winfried Gräfen, Plasma Carburizing, Steel Heat Treating Fundamentals and Processes, Vol 4A, ASM Handbook, Edited By Jon L. Dossett, George E. Totten, ASM International, 2013, p 591–598,

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