Browsing by Author "Brown I.G."

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    Investigation on the tribology of Zr ion implanted tool steel
    (2002) Akbas N.; Oztarhan A.; Monteiro O.R.; Brown I.G.
    AISI D3 tool steel was ion implanted with zirconium and the improvement in surface tribological properties investigated. The Zr ion implantation was done using a metal vapor vacuum arc (Mevva) broad-beam ion source, with a mean ion energy of 130 keV and at doses of 3.6 × 1016, 5 × 1016 and 1 × 1017 ions/cm2. Wear, friction and hardness of the implanted samples were measured and compared to the performance of unimplanted steel. The wear resistance was increased by about a factor of two, the friction remained about the same or was possibly increased by a small amount and the near-surface hardness was improved by a factor of five or more by the ion implantation. We also investigated the effect on the Zr implantation profile of the multi-component energy distribution of the ion beam. © 2002 Elsevier Science B.V. All rights reserved.
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    High fluence effects on ion implantation stopping and range
    (2005) Selvi S.; Tek Z.; Öztarhan A.; Akbaş N.; Brown I.G.
    We have developed a code STOPPO which can be used to modify the more-widely used ion implantation codes to more accurately predict the mean nuclear and electronic stopping power, preferential sputtering and range of heavy ions in monatomic target materials. In our simulations an effective atomic number and effective atomic mass are introduced into conveniently available analytical stopping cross-sections and a better fitting function for preferential sputtering yield is carefully evaluated for each ion implantation. The accuracy of the code confirmed experimentally by comparison with measured Rutherford backscattering spectrometry (RBS) concentration profiles for 130 keV Zr ions implanted into Be to fluences of 1 × 1017, 2 × 10 17 and 4 × 1017 ions/cm2. We find a steady increase in the mean nuclear and electronic stopping powers of the target; the increase in nuclear stopping power is much greater than the increase in electronic stopping power. © 2004 Elsevier B.V. All rights reserved.
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    Sliding wear behaviour of Zr-ion-implanted D3 tool steel
    (2007) Saklakoglu N.; Saklakoglu I.E.; Ceyhun V.; Monteiro O.R.; Brown I.G.
    The wear and friction characteristics of zirconium-ion-implanted AISI D3 tool steel have been investigated using pin-on-disc methods. Ion implantation was carried out using a vacuum-arc-based ion implanter to form multicharged zirconium ion beams at a mean ion energy of 130 keV, and the implantation doses investigated were approximately 3.6×1016, 5×1016 and 1×1017 ions cm-2. It was found that Zr implantation decreased both the wear and the coefficient of friction. The beneficial effects of Zr implantation in terms of associated Auger electron spectroscopy, Rutherford backscattering spectroscopy and scanning electron microscopy microprobe analyses are described. © 2006 Elsevier Ltd. All rights reserved.
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    Neural cell attachment on metal ion implanted glass surfaces
    (2012) Sokullu-Urkac E.; Oztarhan A.; Deliloglu-Gurhan I.; Gulce-Iz S.; Feyzan O.-K.; Brown I.G.
    We have explored the application of ion implantation as a tool for the enhancement of neural cell growth on glass surfaces. Glass substrates were ion implanted with gold and with carbon using a metal vapor vacuum arc (MEVVA) ion source-based implantation system at Ege University Surface Modification Laboratory. The implantation dose was varied over the range 10 14-1017 ions/cm2 and the ion energy spanned the range 20-80 keV. B35 neural cells were seeded and incubated on the implanted substrates for 48h at 37°C. After 2-days in culture the cell attachment behavior was characterized using phase contrast microscopy. The adhesion and direct contact of neural cells on these ion implanted glass surfaces were observed. © 2011 Materials Research Society.