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    The effect of Al2O3 on the friction performance of automotive brake friction materials
    (Elsevier Sci Ltd, 2007) Boz, Mustafa; Kurt, Adem
    This study consists of two stages. In the first stage, bronze-based break linings were produced and friction-wear properties of them were investigated. In the second stage, 0.5%, 1%, 2% and 4% alumina (Al2O3) powders were added to the bronze-based powders and Al2O3 reinforced bronze-based break linings were produced. Friction-wear properties of the Al2O3 reinforced samples were asto investigated and compared to those of plain bronze-based ones. For this purpose, friction coefficient and wear behaviour of the samples were tested on the grey cast iron disc. The hardness and density of the samples were also determined. Microstructures of the samples before and after the sintering and the worn surfaces of the wear specimens were examined using a scanning electron microscope (SEM). The sample compacted at 350MPa and sintered at 820 degrees C exhibited the optimum friction-wear behaviour, With increase in friction surface temperature, a reduction in the friction coefficient of the samples was observed. The lowest reduction in the friction coefficient with increasing temperature was for the 2% and 4% Al2O3 reinforced samples. The SEM images of the sample indicated that increase in Al2O3 content resulted in adhesive wear. With increase in Al2O3 content, a reduction in mass loss of the samples was also observed. Overall, the samples reinforced with 2% and 4% Al2O3 exhibited the best results. (c) 2006 Elsevier Ltd. All rights reserved.
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    The Effect of Time of Powder Removal on Powder Particle Size and Shape Copper Powder Produced by Electrolysis Method
    (Trans Tech Publications Ltd, 2011) Kurt, Adem; Boz, Mustafa
    In this study, electrolyze unit, which is used for the production of metal powders, was designed and produced. The production of powder was carried out by using different parameter times of powder removal (5, 10, 20, 30 and 40 min.). The effect of time of powder removal on powder particle size and shape was examined. Laser particle measurement machine and SEM were also used to measure particle size and particle shape respectively. Experimental results indicated that an increase in time of powder removal caused an increase in powder particle size and its shape changed from acicular dentritic to globular dentritic.
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    Selective electrochemical etching of the Sn-3Ag-0.5Cu/0.07 wt% graphene nanoparticle composite solder
    (Elsevier, 2021) Ahmad, Ibrahym; Nazeri, Muhammad Firdaus Mohd; Salleh, Nor Azmira; Kheawhom, Soorathep; Erer, Ahmet Mustafa; Kurt, Adem; Mohamad, Ahmad Azmin
    The morphological changes of SAC305 solder alloy with the addition of 0.07 wt% graphene was investigated using selective electrochemical etching. To evaluate the effect of graphene inclusion, selective electrochemical removal of the beta-Sn phase from SAC305 and SAC305/0.07GNP was performed using a standard three-electrode cell approach at specific potentials determined by cyclic voltammetry. The phase, chemical structure and microstructural changes were observed. The texture and the phases of SAC305 solder paste were retained, while the microstructure of beta-Sn and Ag3Sn was refined owning to graphene addition. Sufficient removal of beta-Sn without affecting other phases was obtained by using etching potential below -350 mV. Due to Van der Waals force attraction, two types of agglomeration of graphene were observed from cross-sectional observation. Large agglomerations seen at the vicinity of solder/substrate interface were found to help in forming diffusion barrier. This contributes to the refinement of microstructure with the presence of graphene. Accurate observation regarding the shape and texture of the intermetallic compound (IMC) phases affected by the addition of graphene provided by selective electrochemical removal helps better insight into understanding the electrochemical dissolution mechanism of SAC alloys. (C) 2021 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.