Browsing by Author "Ceyhun V."

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    Tribological behaviour of plasma immersion ion implanted AISI 304 stainless steel against polymer and ceramic counterfaces
    (2007) Saklakoǧlu N.; Saklakoǧlu I.E.; Ceyhun V.; Aǧaçhan N.; Short K.T.; Collins G.A.
    Type 304 austenitic stainless steel samples were implanted with nitrogen using plasma immersion ion implantation (Pill) at different temperatures between 350 and 500°C. Treated and untreated samples have been studied by wear-friction testing, microhardness measurement and scanning electron microscopy (SEM).The experimental results indicated that the hardness and wear resistance is improved by increasing the penetration depth of nitrogen, whereas the friction coefficient is significantly increased by PIII. © 2007 Institute of Materials, Minerals and Mining.
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    The life of WC-Co cutting tools treated by plasma immersion ion implantation
    (2007) Saklakoglu I.E.; Saklakoglu N.; Ceyhun V.; Short K.T.; Collins G.
    In this study, the tool life of plasma immersion nitrogen-implanted cutting inserts while machining AISI 4140 steel has been investigated. The implantation time was 5 h and the temperature was in the range 320-520 °C. Implantation dose was ∼2×1018 ions cm-2 for all treatments. Surface topography of the implanted surfaces was obtained from atomic force microscopy. Results of the turning tests are discussed in terms of tool life (flank wear) and surface roughness of the workpieces. The results show that plasma immersion nitrogen implantation increased tool life by about 85%. © 2006 Elsevier Ltd. 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.