Development of silver-containing austenite antibacterial stainless steels for biomedical applications Part I: Microstructure characteristics, mechanical properties and antibacterial mechanisms

Chiung Fang Huang, Hsi Jen Chiang, Wen Chien Lan, Hsin Hua Chou, Keng Liang Ou, Chih Hua Yu

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The as-quenched (AQ) microstructure of the Ag-containing alloys was found to be essentially a mixture of austenite (γ) and Ag phases. The Ag phase precipitates had a face-centered-cubic structure and lattice parameter a = 4.09 Å. When the alloy contained Ag ≥0.2 wt%, the mechanical properties were slightly enhanced because of the precipitate strengthening by the Ag phase precipitates. Moreover, the Ag-containing alloys exhibited ductile fracture after tensile testing. The results of an antibacterial test revealed that the Ag phase precipitates play a key role in the antibacterial mechanism of Ag-containing alloys: Ag+ ions released from the Ag phase precipitates can kill bacteria. It is suggested that as AISI 316L alloy has an Ag content ≥0.2 wt%, it will have excellent antibacterial properties against both Staphylococcus aureus and Escherichia coli, with an antibacterial rate of nearly 100%.

Original languageEnglish
Pages (from-to)449-457
Number of pages9
JournalBiofouling
Volume27
Issue number5
DOIs
Publication statusPublished - May 2011

Keywords

  • Ag phase
  • Ag ion release
  • Antibacterial mechanism
  • Antibacterial stainless steel
  • Mechanical properties
  • Microstructure

ASJC Scopus subject areas

  • Aquatic Science
  • Water Science and Technology
  • Applied Microbiology and Biotechnology

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