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  • Vpliv frekvence pulziranja na strukturo nitrocementirane spojinske plasti = Influence of pulse frequency on plasma nitrocarburising compound layer structure
    Leskovšek, Vojteh ...
    Pulse plasma nitrocarburising has grown to become a thermochemical heat treating process of particular technological and economic importance for improving the surface characteristics of mechanical ... engineering components. In the paper a short survey of theoretical aspects of pulse plasma nitrocarburising is given and its significance in the industrial pulse plasma nitrocarburising treatment is assessed. Pulse plasma nitrocarburising of gas shock absorber tubes from steel W. No. 0.116 was performed at 580°C in atmosphere containing carbon dioxide gas additions. The pulse frequency used ranges between d.c. and 27 kHz. To obtain uniform nitriding depths and uniform compound layer thickness it is important to emphasise that the process parameters - appiled voltage, pulsing frequency, load configuration, etc. - must be selected empirically. Variations in compound layer structure, thickness, porosity, hardness-depth profile and stability of the process were investigated. It was found that the formation of a predominantly ▫$\epsilon$▫ phase compound layer structure is favoured by the use of high nitrogene atmosphere. The compound layer thickness was found to increase with high (87 vol.-%) nitrogen content, high temperature and pulse and by decreasing carbon dioxide content. The experiments have revaled that the use of high nitrogene atmosphere produces pores in the compound layer on steel W. No. 1.0116. Proper process control and the addition of carbon dioxide to the atmosphere with high content of nitrogen results in a reasonably thick compound layer composed predominantly of ▫$\epsilon$▫ phase.
    Vir: Program in knjiga povzetkov (Str. 95)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 1998
    Jezik - angleški
    COBISS.SI-ID - 122026

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