Surface modification of austenitic stainless steel with plasma nitriding for biomedical applications |
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| Authors: | Keng-Liang Ou Hsin-Hua Chou Chung-Ming Liu Pei-Wen Peng |
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| Affiliation: | a Research Center for Biomedical Devices, Taipei Medical University, Taipei 110, Taiwanb Research Center for Biomedical Implants and Microsurgery Devices, Taipei Medical University, Taipei 110, Taiwanc Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei 110, Taiwand School of Dentistry, Taipei Medical University, Taipei 110, Taiwane Dental Department, Wan-Fan Hospital, Taipei, Taiwanf Department of Chemical and Material Engineering, Lunghwa University of Science and Technology, Taoyuan 306, Taiwang School of Dental Technology, Taipei Medical University, Taipei 110, Taiwan |
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| Abstract: | In the present study, plasma nitriding of AISI type 303 austenitic stainless steel (SS) specimens was performed using a microwave system. The nitrided layers were characterized by performing scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and a Vickers microhardness test. The antibacterial activities of the nitrided layers were evaluated. XRD and TEM showed that a single γN phase was formed by plasma nitriding at the plasma power of 700 W and 450 °C. The analytical results demonstrated that the hardness of type 303 specimens could be enhanced by plasma nitriding because of the formation of the γN phase. A bacterial test also demonstrated that the nitrided layer exhibited excellent antibacterial properties. |
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| Keywords: | 303 austenitic stainless steel γN phase Plasma nitriding |
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