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EFFECTS OF COPPER ION IMPLANTATION ON ANTIBACTERIAL ACTIVITY OF AISI420 STAINLESS STEEL

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Acta Metallurgica Sinica(English Letters) 2005年第2期18卷 153-158页

作者： Z.G.Dan H.W.Ni B.F.Xu J.Xiong P.Y.Xiong schoolofmaterialandmetallurgy WuhanUniversityofScienceandTechnologyWuhan430081China SchoolofMedicineScience WuhanUniversityofScienceandTechnologyWuhan430081China

Antibacterial activity of AISI420 stainless steel (SS) implanted by copper was investigated. Ions extracted from a metal vapor vacuum arc (MEVVA) are sourced with 100keV energy and a dose range from 0.2×1017 to 2.0×1017ions·cm-2. The saturation dose of Cu implantation in AISI420 SS and Cu surface concentration were calculated at the energy of 100keV. The effect of dose on the antibacterial activity was analyzed. Results of antibacterial test show that the saturation dose is the optimum implantation dose for best antibacterial activity, which is above 99% against both Escherichia coli and Staphylococcus aureus. Novel phases such as Fe4Cu3 and Cu9.9Fe0.1 were found in the implanted layer by glancing angle X-ray diffraction (GXRD). The antibacterial activity of AISI420 SS attributes to Cu-contained phase.

关键词： antibacterial stainless steel copper ion implantation saturation dose Cu-contained phase

EFFECT OF COPPER IMPLANTATION ON ANTIBACTERIAL ACTIVITY OF AUSTENITIC STAINLESS STEEL

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 870-875页

作者： J.Xiong B.F.Xu H.W.Ni P.Y.Xiong Z.G.Dan schoolofmaterialandmetallurgy WuhanUniversityofScienceandTechnologyWuhan430081China SchoolofMedicineScience WuhanUniversityofScienceandTechnologyWuhan430081China

Antibacterial activity has been studied by copper ion implantation into 0Cr18Ni9 stainless steel. Ions extracted from a metal vapor vacuum arc (MEVVA) are sourced with 60-100keV energy and a dose range (0.2-2.0)×1017 ions cm-2. Saturation doses, surface concentration were calculated and the relationships between energy, dose and antibacterial activity were analyzed. Novel phases such as Fe4Cu3 and Cu0.81Ni0.19 were found after copper implantation by X-ray diffraction. The novel phases, effects on antibacterial activity have been investigated. The results show that saturation dose varies with the ions' energy. Antibacterial activity has close relation with copper,s concentration in implanted layer and Cu-rich phase.

关键词： stainless steel copper ion implantation saturation dose concentration in implanted layer antibacterial activity

High temperature oxidation behavior of high speed steel for hot rolls material

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Journal of University of Science and Technology Beijing 2005年第2期12卷 166-171页

作者： LiZhou FangLiu ChangshengLiu DaleSun LisongYao schoolofmaterialandmetallurgy NortheasternUniversityShenyang110004China TechnologyCenter BaoshanIron＆SteelCo.Ltd.Shanghai201900China

The oxidation characteristics of high speed steel (HSS) were studied at 500 to 800°C. The non-isothermal oxidation and isothermal oxidation (500, 575, 650, 725, 800°C) of HSS were investigated by thermo-gravimetric analysis (TGA). The microstruc- ture, morphology and oxide scale thickness of the isothermal oxidation samples were analyzed by optical microscope (OM), electron probe micro analyzer (EPMA), X-ray diffraction spectrum (XRD) and scanning electron microscope (SEM). The results indicate that the oxidation rate of HSS is very slow at 500 to 650°C, increasing gradually at 650 to 750°C, and drastically at 750 to 800°C, be- cause the phase transformation happens at about 750°C.

关键词： high speed steel high temperature oxidation isothermal oxidation non-isothermal oxidation oxide kinetics

EFFECTS OF Pb COMPOUND ADDITIVES ON THE PROPERTIES OF YBa_2Cu_3O_(7-δ)

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Acta Metallurgica Sinica(English Letters) 2005年第2期18卷 145-148页

作者： F.H.Li Z.G.Fan J.Wang C.S.Liu D.W.Soh Y.J.Cho schoolofmaterialandmetallurgy NortheasternUniversityShenyang110004China MyongjiUniversity Yongjin449-728SouthKorea

The melting temperature and critical transition temperature Tc of YBa2Cu3O7-δ with deferent content additives of PbO and BaPbO3 were studied. When PbO was doped in YBa2Cu3O7-δ, the melting temperature of YBa2Cu3O7-δ was reduced, however its superconductivity was weakened. From the XRD pattern of the sintered mixture of YBa2Cu3O7-δ and PbO, it was known that there was a reaction between YBa2Cu3O7-δ and PbO, and the product was BaPbO3. Hence different contents of BaPbO3 (10mass%, 20mass% and 30mass%) were added in YBa2Cu3O7-δ. It was proved that there were no reactions between YBa2Cu3O7-δ and BaPbO3. And the superconductivity of the mixtures was much better than that of the samples with PbO additive.

关键词： YBa2Cu3O7-δ PbO additive melting temperature superconductivity