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Öğe Biodiesel production from animal fat-palm oil blend and performance analysis of its effects on a single cylinder diesel engine(SILA SCIENCE, 2011) Sugozu, Ilker; Eryilmaz, Tanzer; Ors, Ilker; Solmaz, OzgurNowadays, the decrease in fossil based energy reserves and their negative impact on the environment have increased the interest in alternative energy sources. Vegetable oils and animal fats are used as alternatives of fuels that are used in diesel engines. High viscosity of vegetable oils and animal fats cause several problems in diesel engines. Methods such as dilution, pyrolysis, and transesterification are utilized to eliminate these problems. In this study, using transesterification method, biodiesel is produced from 30% animal fat 70% palm oil blend which has a substantial potential for being an alternative fuel for diesel engines. The impact of biodiesel on engine performance and exhaust emissions are investigated on a single cylinder, air cooled, pre-combustion chamber diesel engine. Engine performance values of biodiesel are obtained close to those values of diesel fuel. A decrease in CO emission and a slight increase in NO emission are observed. Following the experimental results, it is concluded that biodiesel produced from 30% animal fat and 70% palm oil could be used as an alternative fuel for diesel engine. Moreover, the positive impacts of biodiesel on environment in terms of exhaust emissions also increase its potential of being an alternative fuel.Öğe The effect of colemanite on the friction performance of automotive brake friction materials(EMERALD GROUP PUBLISHING LTD, 2016) Sugozu, Ilker; Mutlu, Ibrahim; Sugozu, Kezban BanuPurpose - The purpose of this paper is to investigate use of colemanite (C) upon friction and wear performance of automotive brake lining. Brake lining production with the boron product colemanite addition and braking characterization investigated for development of non-asbestos organic (NAO) brake lining because of negative effects on human health and environmental hazard of asbestos containing linings. During the braking, brake lining is warmed up extremely due to friction, and the high temperature causes to decreasing of breaking performance. Colemanite has high melting temperature, and this makes this material valuable for brake lining. Design/methodology/approach - This study investigated the effect of colemanite (C) upon friction and wear performance of automotive brake lining. Based on a simple experimental formulation, different amounts of boron product colemanite were used and then evaluated using a friction assessment and screening test. In these specimens, half of the samples (shown with H indices) were heat treated in 4 h at 180 degrees C temperature. Friction coefficient, wear rate and scanning electron microscope for friction surfaces were used to assess the performance of these samples. Findings - The results of test showed that colemanite can substantially improve properties of friction materials. The friction coefficient of friction materials modified with colemanite varies steadily with the change of temperature, and the wearing rate of friction materials is relatively low by using colemanite. Heat treatment-applied samples (CH) have provided a higher and stable friction coefficient. These results indicate that colemanite has ideal application effect in various friction materials. Originality/value - This paper fulfils an identified information and offers practical help to the industrial firms working with brake lining and also to the academicians working on wear of materials. Parallel results have been presented between previously reported and present study, in view of brake characteristics and wear resistance. Use of the lower cost and productive organic sources of material are the main improvement of the present study.Öğe The effect of different dwell times at a constant pelletization pressure of 6 GPa on superconducting properties of Bi1.8Sr2Ca1.1Cu2.1Oy ceramics(SPRINGER, 2016) Aytekin, M. Ersin; Ozkurt, Berdan; Sugozu, K. Banu; Kose, Ercan; Sugozu, IlkerIn this study, the physical and magnetic properties of Bi1.8Sr2Ca1.1Cu2.1Oy superconductors kept in different dwell times (1, 6, and 12 h) at a constant pelletization pressure of 6 GPa in the pressing step as prepared by standard solid-state reaction method are reported. The X-ray diffraction data shows that all samples have a tetragonal crystal structure with predominant Bi-2212. SEM micrographs for all samples predominately show plate-like grain structure, indicating the presence of Bi-2212 phase. Both T-c (onset) and T-c (offset) significantly increase with increasing dwell time. M-H measurements were performed at T = 10 and 25 K, respectively. In addition, J(c) values of the samples were calculated from their magnetic hysteresis loops using the Bean's model. It has been found that J(c) in the samples including long dwell times under the pelletization pressure of 6 GPa improves.Öğe The effect of ulexite to the tribological properties of brake lining materials(WILEY, 2018) Sugozu, Ilker; Mutlu, Ibrahim; Sugozu, Kezban BanuRecently, different brake pads have started to be investigated in brake friction industry by replacing the asbestos with new materials. This paper presents the role of Ulexite on friction assessment and screening Test of newly formulated brake pads. Friction coefficient, specific wear ratio, and scanning electron microscope SEM for friction surfaces were examined to assess the performance of brake pads. From the results, they concluded that the friction material containing Ulexite improved friction stability and fade resistance. Further, for heat treated samples they claimed a higher and stable friction coefficient. POLYM. COMPOS., 39:55-62, 2018. (c) 2016 Society of Plastics Engineers
