Microstructure and antibacterial properties of microwave plasma nitrided layers on biomedical stainless steels

Li Hsiang Lin, Shih Chung Chen, Ching Zong Wu, Jing Ming Hung, Keng Liang Ou

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27 Citations (Scopus)


Nitriding of AISI 303 austenitic stainless steel using microwave plasma system at various temperatures was conducted in the present study. The nitrided layers were characterized via scanning electron microscopy, glancing angle X-ray diffraction, transmission electron microscopy and Vickers microhardness tester. The antibacterial properties of this nitrided layer were evaluated. During nitriding treatment between 350 °C and 550 °C, the phase transformation sequence on the nitrided layers of the alloys was found to be γ → (γ + γN) → (γ + α + CrN). The analytical results revealed that the surface hardness of AISI 303 stainless steel could be enhanced with the formation of γN phase in nitriding process. Antibacterial test also demonstrated the nitrided layer processed the excellent antibacterial properties. The enhanced surface hardness and antibacterial properties make the nitrided AISI 303 austenitic stainless steel to be one of the essential materials in the biomedical applications.

Original languageEnglish
Pages (from-to)7375-7380
Number of pages6
JournalApplied Surface Science
Issue number17
Publication statusPublished - Jun 15 2011



  • Antibacterial property
  • Antibacterial stainless steel
  • Microstructure
  • Microwave plasma
  • Nitridation

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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