Browsing by Author "Islak, S, Kir, D, Celik, H"

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    Investigation of the usability of cubic boron nitride cutting tools as an alternative to diamond cutting tools
    (2013-12-01) Islak S., Kir D., Çelik H.; Islak, S, Kir, D, Celik, H
    Diamond and cubic boron nitride cBN cutting segments were produced using hot pressing technique for this study to be used in cutting natural stone. cBN grains were added to bronze powder, the chosen matrix, at a rate of 0%, 20%, 40%, 60%, 80%, and 100% (according to percentage by weight). Segments were produced under a pressure of 35 MPa, at a sintering temperature of 600°C, over a sintering time of 3 minutes. The cutting properties of the produced segments were determined by cutting Ankara andesite. A Scanning Electron Microscope SEM and an X-Ray Diffractometer XRD were used to analyse the microstructure, phase compound, and wear surfaces of each segment type.
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    Wear characteristics of circular cBN/diamond saws produced by hot pressing
    (2014-01-01) Islak S., Kir D., Çelik H.; Islak, S, Kir, D, Celik, H
    This study describes the investigation of wear characteristics of circular cBN/diamond saws produced by hot pressing. In order to determine the usability of cBN instead of diamond, cBN and diamond grains were added to the bronze matrix. Production of the saws was performed at a sintering temperature of 600-700 °C for a sintering time of 3 minutes. Sawing tests were carried out to determine the wear characteristics of the saws by sawing natural stone. It is concluded that cBN together with diamond could be added to the matrix with a concentration of 12 (the rest of concentration of 30 is diamond) and that the saws will have more wear if this concentration is exceeded. After sawing, SEM analyses of the saws indicate that there were more fractures and wear in cBN grains in comparison to the diamond grains. The results concluded that cBN can be used to saw softer natural stones, or can be added to the matrix together with diamond. © Carl Hanser Verlag, München Materials Testing.