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Öğe Abrasive wear behavior and mechanical properties of Al-Si/SiC composites(Elsevier Science Sa, 2004) Ahlatci, A; Candan, E; Çimenoglu, HIn this study, the effect of Si addition up to 8% Si on the abrasive wear and mechanical properties of Al-Si/60 vol.% SiC composites produced by pressure infiltration technique has been investigated. Optimum properties in terms of improved strength and abrasion resistance without significant loss in toughness were obtained when the matrix alloy contained 1% Si. At Si contents higher than 1%, dramatic decrease of toughness was accompanied a reduction in strength and abrasion resistance. (C) 2004 Elsevier B.V. All rights reserved.Öğe Abrasive wear behaviour of Al-SiC composites produced by pressure infiltration technique(Elsevier Science Sa, 2001) Candan, E; Ahlatci, H; Çïmenoglu, HIn this study, abrasive wear behaviours of compacts produced by pressure infiltration technique were investigated. Pure aluminium and SiC particles having 13 and 37 mum mean diameters were used in the infiltration process. The volume fraction of the SiC particles was 60% in the compacts. Abrasive wear tests were carried out under the normal load of 28 N, by rubbing the compacts to abrasive Al2O3 grains with diameters in the range of 85-250 mum. Wear tests revealed that, the effect of the size of SIC particles on the wear resistance of compacts, depends on the size of the Al2O3 abrasive grains being rubbed. The compact which had 13 mum SiC particles exhibited higher wear rate than the compact having 37 mum SiC particles when rubbed on fine abrasive Al2O3 grains (<150 m) Wear tests performed on Al2O3 abrasive grains having diameters higher than 150 mum revealed that, the compact reinforced with 37 mum SiC particles had higher wear rate than the compact reinforced with 13 mum SiC particles. (C) 2001 Elsevier Science B.V. All rights reserved.Öğe Effect of alloying additions on the porosity of SiCp preforms infiltrated by aluminium(Elsevier Science Bv, 2006) Candan, EInfiltrations of SiC powder (SiCp) preforms by a series of Al-based melts have been carried out in a pressure vessel. Effects of alloying additions (Pb, Mg, Cu and Si) on amount of porosity in the infiltrated preforms were investigated. The porosity measurements were carried out by image analysis using an optical microscope in conjuction with a computer having image analysis software programs. The relationship between the amount of porosity was evaluated in the lights of present understanding of the wetting behaviour of the components. Additions of Pb, increased the porosity while Cu, and Si addition did not effect it appreciably. The porosity were significantly reduced by increasing Mg content of Al. (c) 2005 Elsevier B.V. All rights reserved.Öğe Effect of ceramic particle size and applied pressure on time to complete infiltration of liquid aluminium into SiC powder compacts(Kluwer Academic Publ, 2000) Candan, E; Atkinson, HV; Jones, HMonitoring of pressurized advance of liquid aluminium into SiC particle compacts of mean particle sizes 12.8, 22.8 and 36.7 mu m was carried out under applied pressures of 400 to 900 kPa. Infiltration time of liquid aluminium in the compact was recorded by computer logging the output from pairs of open ended wires with a potential difference between them. Results showed that time necessary to complete infiltration in the compacts decreased with increasing particle size and increasing applied pressure. Experimental results are in reasonably good agreement with model predictions. (C) 2000 Kluwer Academic Publishers.Öğe Effect of magnesium addition on wear behaviour of Al-70 vol.-%Al2O3p composites(Taylor & Francis Ltd, 2003) Ahlatci, H; Karakas, MS; Candan, E; Çimenoglu, HIn this study, dry sliding and abrasive wear behaviour of Al - 70 vol.-%Al2O3 particulate composite alloyed with Mg was examined. The composites were produced by a pressure infiltration casting technique. The composition of the matrix varied between 0 and 8 wt-%Mg, and the diameter of the Al2O3 particulates was 60 mum. Dry sliding wear tests were carried out on an unlubricated M2 quality high speed tool steel disc by a pin on disc type wear tester. Abrasive wear tests were run by rubbing the composites on abrasive Al2O3 grains. The results of the wear tests revealed that, both dry sliding and abrasive wear resistance of the composites increased with increasing Mg content in the matrix. MST/5421 Mr Ahlatci. Mr Karakas and Professor Dr Cimenoglu are in the Department of Metallurgical and Materials Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey (heimen@itu.edu.tr). Associate Professor Candan is in the Technical Education Faculty, Division of Metal Casting, Zonguldak Karaehnas University 78100 Karabuk, Turkey. Manuscript received 4 February 2002: accepted 27 August 2002. (C) 2003 IOM Communications Ltd. Published by Maney, for the Institute of Materials, Minerals and Mining.Öğe Effect of the particle size on the mechanical properties of 60 vol. % SiCp reinforced Al matrix composites(Carl Hanser Verlag, 2002) Ahlatci, H; Candan, E; Çimenoglu, HThe effect of the reinforcing particle size on the mechanical properties of 60 vol.% SiC reinforced aluminium matrix composites produced by the pressure infiltration technique was examined by compression, impact and wear tests. The compression strength and the impact resistance decreased with increasing reinforcing particle size. The composites exhibited different abrasion behaviour depending on the size of abrasive Al2O3 grains. On fine abrasive Al2O3 grains (85 mum), the abrasion resistance increased with increasing reinforcing SiC particle size. The contrary result was obtained on coarse abrasive Al2O3 grains (250 mum). The wear tests conducted on M2 quality tool steel revealed that reinforcing of aluminium with coarse SiC particles has a very beneficial effect on the wear resistance with respect to fine reinforcing SiC particles.Öğe Mechanical properties of Al-60 Pct SiCp composites alloyed with Mg(Springer, 2004) Ahlatci, H; Candan, E; Çimenoglu, HIn the present work, the effect of an Mg addition on the mechanical properties of the Al-60 vol pet SiCp composites were investigated by uniaxial compression, three-point bending, impact and wear tests (composite-metal and composite-abrasive types). The composites were produced by the pressure-infiltration technique. The composition of the Al matrix was varied between 0 and 8 pet Mg. The mean diameter of the SiC particles was 23 mum. Upon addition of Mg, Mg2Si precipitated in the matrix and the amount of the porosity dramatically decreased. Mg-alloyed-matrix composites exhibited higher strength, lower toughness, and higher wear resistance than pure-Al-matrix composites. During composite-metal wear testina, wear progressed in two sequential periods (running-in and steady state). Weight loss during wear testing, decreased with increasing Mg content of the matrix. The degree of improvement of abrasive resistance depended on the abrasive-grain size. Above 200 degreesC, the composite-abrasive wear resistance decreased with increasing test temperature for all materials.Öğe Relationship between glass fiber content and particle size of sprayable tundish lining (MgO) on the wettability of molten steel/MgO system(Canadian Inst Mining, Metallurgy And Petroleum, 2004) Turen, Y; Candan, E; Karakas, Y; Sahinturk, CIn this study, wettability between sprayable tundish lining (MgO) and molten steel was investigated by using sessile drop method. Content of glass fiber (SiO2) in the MgO varied between 0 to 8 wt% whereas mean particle sizes of the MgO were 25, 75, 150 and 300 mu m. Experimental results revealed that contact angle (0) of sessile drop on the MgO was not altered by the addition of glass fiber up to 1wt.% whereas above 2 wt.% addition decreased the 0 considerably. Contact angle, theta, increased considerably with increasing MgO particle size. SEM analysis showed deposition of glass phase was present at the interface as the finer MgO particles were used.Öğe Wear behaviour of Al/(Al2O3p+SiCp) hybrid composites(Elsevier Sci Ltd, 2006) Ahlatci, H; Koçer, T; Candan, E; Çimenoglu, HIn this study, dry sliding metal-metal and metal-abrasive wear behaviours of the aluminium matrix hybrid composites produced by pressure infiltration technique were investigated. These composites were reinforced with 37 vol% Al2O3 and 25 vol% SiC particles and contained up to 8 wt% Mg in their matrixes. While matrix hardness and compression strength increased, amount of porosity and impact toughness decreased with increasing Mg content of the matrix. Metal-metal and metal-abrasive wear tests revealed that wear resistance of the composites increased with increasing Mg addition. On the other hand, abrasive resistance decreased with increasing test temperature, especially above 200 degrees C. (c) 2005 Elsevier Ltd. All rights reserved.
