Antibacterial Property and Precipitation Behavior of Ag-Added304 Austenitic Stainless Steel
来源期刊:Acta Metallurgica Sinica2014年第3期
论文作者:Yang Xuan Chi Zhang Nianqing Fan Zhigang Yang
文章页码:539 - 545
摘 要:A 304 stainless steel with the addition of 0.27 wt% Ag was found to exhibit excellent antibacterial properties.Based on Thermo-Calc calculation, a special heat treatment was introduced to obtain Ag precipitate in this steel. Antibacterial experiments show that the alloy can kill the adhering Escherichia coli effectively. Since the Ag element plays a key role in killing the adhered bacteria, microstructures of Ag and Ag-rich compounds were characterized by scanning electron microscopy and transmission electron microscopy. Ag-rich compounds with the size of a few microns were found to be embedded within the matrix and along grain boundaries, Moreover, pure Ag particles with a lattice parameter of 0.422 nm were found within the austenite matrix. The orientation relationship between the matrix and Ag particles was identified. Nano-sized Ag particles were precipitated during heat treatment, and the interfacial energy between Ag precipitates and matrix was determined by Becker’s model calculation.
Yang Xuan1,Chi Zhang1,Nianqing Fan2,Zhigang Yang1
1. School of Materials Science and Engineering, Tsinghua University2. Suzhou Nuclear Power Research Institute
摘 要:A 304 stainless steel with the addition of 0.27 wt% Ag was found to exhibit excellent antibacterial properties.Based on Thermo-Calc calculation, a special heat treatment was introduced to obtain Ag precipitate in this steel. Antibacterial experiments show that the alloy can kill the adhering Escherichia coli effectively. Since the Ag element plays a key role in killing the adhered bacteria, microstructures of Ag and Ag-rich compounds were characterized by scanning electron microscopy and transmission electron microscopy. Ag-rich compounds with the size of a few microns were found to be embedded within the matrix and along grain boundaries, Moreover, pure Ag particles with a lattice parameter of 0.422 nm were found within the austenite matrix. The orientation relationship between the matrix and Ag particles was identified. Nano-sized Ag particles were precipitated during heat treatment, and the interfacial energy between Ag precipitates and matrix was determined by Becker’s model calculation.
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