Low temperature nitriding of AISI 316L stainless steel and titanium in a low pressure arc discharge |
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| Affiliation: | 1. División Hidrógeno en Materiales, Gerencia Materiales, GAEN, Centro Atómico Constituyentes, Av. Gral. Paz 1499, San Martín B1650KNA, Buenos Aires, Argentina;2. Research Center on Surface Processes, Nanomaterials Unit, National Institute of Industrial Technology (INTI), C.C.157, San Martín B1650KNA, Buenos Aires, Argentina;3. CONICET, Argentina;4. Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, Martín de Irigoyen 3100, Edificio Tornavía, Campus Miguelete, 1650 San Martín, Buenos Aires, Argentina;5. IONAR S.A., Arias 3422, C1430CRB, Buenos Aires, Argentina;6. Surface Engineering Group, Universidad Tecnológica Nacional (UTN-FRCU), Ing. Pereira 676, E3264BTD Concepción del Uruguay, Argentina;1. Dept. of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Karnataka575025, India;2. Dept. of Chemistry, National Institute of Technology Karnataka, Surathkal, Karnataka575025, India |
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| Abstract: | AISI 316L stainless steel (SS) and titanium nitriding were studied in a low pressure arc-assisted nitriding process where the substrate temperature and the plasma parameters are uncoupled. Lower nitriding temperature limits were explored for constant plasma parameters in Ar–N2 gas mixtures and substrates at floating potential. Nitrogen superficial concentration, layer thicknesses and X-ray diffraction analyses were performed on SS specimens nitrided at two temperatures (580 and 680 K) for different times and titanium nitriding was studied in the temperature range 750–1025 K. At low temperature, the nitriding performances are limited by a plasma–surface phenomenon that probably involves recombination of nitrogen atoms. |
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