Browsing by Author "Çelik, Ertuğrul"

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    BOR KARBÜRLÜ ELMASLI KESİCİ SOKETLERİN MİKROYAPI VE MEKANİK ÖZELLİKLER
    (6. ULUSLARARASI TOZ METALURJİSİ KONFERANSI ve SERGİSİ, 2011) Islak, Serkan; Kır, Durmuş; Çelik, Halis; Çelik, Ertuğrul
    Bu çalışmada, doğal taş kesme işlerinde kullanılan elmaslı kesici soketlere bor karbür (B4C) ilavesinin mikroyapı ve mekanik özellikleri üzerine etkisi araştırılmıştır. Bu amaçla, deneylerde B4C ağırlıkça % 2, 5 ve 10 oranlarında kullanıldı. Tüm deneylerde sıcak presleme işlemi 35 MPa basınçta, 700 °C sıcaklıkta ve 3 dakika süreyle yapılmıştır. Soketlerin mikroyapı ve faz bileşimi taramalı elektron mikroskobu (SEM), X-ışın difraktogramı (XRD), X ışını enerji dağılım spektrometresi (EDS) ile belirlenmiştir. Mikrosertlik ve eğme dayanımı değerleri ise sırasıyla sertlik ve üç noktalı eğme test cihazıyla ölçülmüştür. Soketlerin sertlik ve eğme dayanımları bor karbürün oranına bağlı olarak değişmiştir. In this study, effect of boron carbide (B4C) addition on microstructure and mechanical properties of diamond cutting segments that are used in cutting works of natural stones were investigated. For this purpose, the boron carbide was changed as 2, 5 and 10 wt. % percents. In all of the experiments, hot pressing process was carried out at 35 MPa pressure, at 700 °C temperature and 3 minutes sintering time. Microstructure and phase composition of segments were determined by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. Microhardness and bending strength values were measured by hardness and three-point bending test devices, respectively. Hardness and bending strength values of segments changed depending on boron carbide rate.
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    DOĞAL TAŞ KESME İŞLERİNDE KULLANILAN ALTERNATİF KÜBİK BOR NİTRÜRLÜ KESİCİ TAKIMLARIN MİKROYAPI VE MEKANİK ÖZELLİKLERİ
    (INTERNATIONAL POWDER METALLURGY CONFERENCE & EXHIBITION, 2011-05-11) Kır, Durmuş; Islak, Serkan; Çelik, Halis; Çelik, Ertuğrul
    Bu çalışmada, doğal taş kesme işlerinde kullanılan elmaslı kesici takımlarda elmasın yerine alternatif olarak kübik bor nitrürün (cBN) kullanılabilirliği araştırılmıştır. Bu amaçla soketlere farklı oranlarda kübik bor nitrür ilave edildi. Tüm soketler 35 MPa basınç altında, 600 °C sıcaklıkta ve 3 dakika sinterleme süresinde sıcak preste üretildi. Soketlerin mikroyapı ve faz bileşimi taramalı elektron mikroskobu (SEM), X-ışın difraktogramı (XRD), X ışını enerji dağılım spektrometresi (EDS) ile belirlenmiştir. Soketlerin mekanik özellikleri üç noktalı eğme testi kullanılarak tespit edilmiştir. Eğme testi sonuçları kübik bor nitrürlü soketlerin eğme mukavemetlerinin elmaslı soketlerinkinden daha yüksek çıktığını göstermiştir.
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    Effect of boron carbide on the microstructure and the mechanical properties of segments produced using hot pressing method
    (Academic Journals Scientific Research and Essays Vol. 7(23), 2012) Islak, Serkan; Kır, Durmuş; Çelik, Ertuğrul; Çelik, Halis
    In this study, effect of boron carbide (B4C) addition on microstructure and mechanical properties of diamond cutting segments was investigated. For this purpose, the boron carbide addition quantity was changed as 2, 5 and 10 wt%. In all of the experiments, hot pressing process was carried out at 35 MPa, at 700°C and sintering time of 3 min. Microstructure and phase composition of segments were determined by Scanning Electron Microscopy, Energy Dispersive Spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis. Hardness and bending strength values were measured by hardness and three-point bending test devices, respectively. Hardness and bending strength values of segments changed depending on boron carbide rate.
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    Effect of boron carbide on the microstructure and the mechanical properties of segments produced using hot pressing method
    (Academic Journals Scientific Research and Essays Vol. 7(23), 2012) Islak, Serkan; Kır, Durmuş; Çelik, Ertuğrul; Çelik, Halis
    In this study, effect of boron carbide (B4C) addition on microstructure and mechanical properties of diamond cutting segments was investigated. For this purpose, the boron carbide addition quantity was changed as 2, 5 and 10 wt%. In all of the experiments, hot pressing process was carried out at 35 MPa, at 700°C and sintering time of 3 min. Microstructure and phase composition of segments were determined by Scanning Electron Microscopy, Energy Dispersive Spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis. Hardness and bending strength values were measured by hardness and three-point bending test devices, respectively. Hardness and bending strength values of segments changed depending on boron carbide rate.
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    Effect of the cBN Content and Sintering Temperature on the Transverse Rupture Strength and Hardness of cBN/Diamond Cutting Tools
    (Science of Sintering, 44 (2012) 235-243, 2012) Kır, Durmuş; Islak, Serkan; Çelik, Halis; Çelik, Ertuğrul
    The aim of this work was to investigate the effect of cBN content and sintering temperature on the transverse rupture strength (TRS) of cBN/diamond cutting tools produced by hot pressing. The segments containing different cBN content were manufactured under 35 MPa pressure at 600, 650 and 700 °C with a 3 minutes sintering time. The TRS of segments were determined using three-point bending test. Microstructure and phase composition of fracture surface of segments were determined by scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. The obtained results show that the TRS of the segments with cBN were higher than that of the segments with diamond.
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    Effect of the cBN Content and Sintering Temperature on the Transverse Rupture Strength and Hardness of cBN/DiamondCutting Tools
    (Science of Sintering, 2012) Kır, Durmuş; Islak, Serkan; Çelik, Halis; Çelik, Ertuğrul
    The aim of this work was to investigate the effect of cBN content and sintering temperature on the transverse rupture strength (TRS) of cBN/diamond cutting tools produced by hot pressing. The segments containing different cBN content were manufactured under 35 MPa pressure at 600, 650 and 700 °C with a 3 minutes sintering time. The TRS of segments were determined using three-point bending test. Microstructure and phase composition of fracture surface of segments were determined by scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. The obtained results show that the TRS of the segments with cBN were higher than that of the segments with diamond