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Industrial Lubrication and Tribology5
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International Journal of Automotive Science And Technology3
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Materials Testing2
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European Mechanical Science1
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International Journal of Advanced Engineering and Technology1
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International Journal of Automotive Engineering and Technologies1
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International Journal of Research in Engineering1
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Journal of Current Research on Engineering, Science and Technology1
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Journal of Current Research on Engineering, Science and Technology1
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Journal of Current Researches on Engineering, Science and Technology1
Investigation of The Effect of Solid Lubricant Particle Sizes on Friction and Wear Properties in Friction Composites: An Experimental Case Study with Graphite
Sugözü, İlker | Sugözü, Banu
Friction composites consist of many materials with various properties. Solid lubricant is one of these materials. The task of the solid lubricant in the compo-site is to protect the counter surfaces against wear and to reduce noise and vibra-tion. Typical solid lubricants used in the friction composite are graphite, antimo-ny trisulfide, molybdenum disulfide, copper sulfide, etc. The selection suitable solid lubricants for better braking performance is an important issue, as solid lubricants may decompose at high temperatures, leading to undesirable results. The particle size of the solid lubricant used is at least as important as itself. In this study, the effect of micro and nanoparticle-sized graphite on friction and wear behavior of friction composites was investigated experimentally. ...
Tribological properties of brake friction materials containing fly ash
Sugözü, Banu
Purpose The purpose of this study is to investigate the potential of fly ash in automotive brake lining materials. Design/methodology/approach Three brake linings containing fly ash (36, 41 and 46 Wt.%) were designed and produced by dry-mixing, pre-forming and hot pressing. The surface hardness of all brake lining samples was measured by using Brinell hardness tester. The density of the specimens was determined based on Archimedean principle in water. The friction and wear characteristics of the brake lining samples were determined using a real brake disc-type tester. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings Fly ash can be good alternative as space filler to reduce the cost for brake lining. Originality/value The present study h...
Tribological and thermal characteristics of copper-free brake friction composites
Sugözü, Banu | Sugözü, İlker
The effects of zinc, steel, aluminum, and brass materials that can be used instead of copper in brake friction composites on braking performance were investigated in this study. The specimens containing three different ratios of metallic shavings were produced by the dry mixing method. In terms of comparison, a total of 16 specimens were examined by producing the specimen containing copper at the same rates and the specimen containing no metallic chip. The weight loss, specific wear rate, and friction coefficient of the specimens were determined by the brake test results. The hardness and density tests were carried out. Thermal conductivity tests of the specimens were carried out to determine the thermal characteristic of copper. Among the metallic chips used, aluminum and steel wool were ...
The effect of ulexite to the tribological properties of brake lining materials
Sugözü, İlker | Sugözü, Banu
Recently, 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
Modeling and Predicting of Tribological Behaviour of the Automotive Brake Pad Using Response Surface Methodology
Sugözü, Banu
In the present study, wear and frictional behaviours of automotive brake pad sliding against GG 20 cast iron counter face have been investigated experimentally using a pin on disc type friction tester. Wear tests were carried out under dry conditions. A central composite design was used to describe response and to estimate the process parameters in the model. Empirical models have been developed to predict wear loss and friction coefficient as a function of contact pressure and sliding velocity using multiple regression. The statistical analysis show that the contact pressure is identified as the most dominant factor affecting wear loss, sliding velocity is identified is the most dominant factor affecting friction coefficients.
The Effect of Wearing Brake Lining Surface on Braking Performance
Sugözü, İlker | Sugözü, Banu
After braking, different wear types and micro-macro gaps occur on the brake lining surface. This situation varies depending on the amount of binder, friction modifier, reinforcement, lubricant and filler materials used in the brake lining content and braking conditions. In this study, the effect of brake lining surface morphology, which is worn after braking, on the tribological properties of the brake lining was investigated. In this context, the wearing surfaces of the brake lining after braking were examined. It has been observed that the braking performance increases depending on the rate of wear types seen on the brake lining surface.
The Effect of Braking Pressure on Friction and Wear Properties of Brake Lining
Sugözü, İlker | Sugözü, Banu
The brake system is used to slow down or stop the vehicle speed. The brake lining is the most important part of the brake system, which is used to slow down or stop the vehicle by converting friction energy into heat energy. The pressure applied to the linings in the vehicle brake system is an important factor for the lining performance. The brake lining exhibits different properties depending on the pressure applied during braking and the brake lining content. In this study, friction coefficient and wear properties of brake linings at braking pressures of 5, 10 and 15 bar were investigated. The pressure increase increased the disc surface temperature and the wear amount of brake lining.
Effect of micro and nano-sized ZrSiO4 particles on the friction and wear properties of polymer matrix composites
Sugözü, Banu | Sugözü, İlker
In this study, the size effect of zircon (ZrSiO4) on the tribological characteristics of polymer matrix friction composites were investigated. Hence, four friction composites containing micro and nano-sized zircon particles (5 and 10 wt%) were developed and produced using powder metallurgy method. Their wear and friction characteristics were examined using a friction-wear test device. The weight loss and specific wear rate were measured and compared with that obtained for microsized zircon particles. The surfaces of samples were analyzed using a scanning electron microscope, and less wear was observed in the samples containing nano-sized zircon particles. The results revealed that the size of abrasive particles plays a key role in enhancing the friction coefficient and friction stability.
Usage of powder pinus brutia cone and colemanite combination in brake friction composites as friction modifier
Sugözü, Banu
Friction composites are materials used in places such as braking systems of highways and rail transportation vehicles. Composites that are resistant to abrasion and environmental conditions such as temperature and humidity and with high resistance to friction are preferred in brake systems. Therefore, friction composites are formed by the combination of many materials with different properties. In this study, five friction composite samples were prepared with various combination of powder Pinus Brutia cone and colemanite. The amount of other ingredients of samples are constant. Samples were produced by conventional dry mixing method. Friction and wear tests were determined by a full-scale brake friction tester. The specific wear rate, friction coefficient and friction stability parameters ...
Friction and wear properties of friction materials containing nano/micro-sized SiO2 particles
Sugözü, Banu
Purpose Among the components used for a car brake lining, the chemical and structural properties of the abrasives, jointly with the morphology and size of the particles influence the friction parameters and stability of the composite. This paper aims to investigate the effect of nano SiO2 particles in brake pads on friction and wear properties. Design/methodology/approach In this paper, the effects of SiO2 (Silica) particles of varying size on the friction-wear properties of polymeric friction composites are investigated. Four friction composites were prepared containing (5, 10 Wt.%) micro silica (MS) particles and (5, 10 Wt.%) nano silica (NS) particles. The samples were produced by a conventional procedure for a dry formulation following dry-mixing, pre-forming and hot pressing. Friction...
Friction and Wear Behavior of Fiber Reinforced Polymer-Matrix Composites Containing Ulexite and Pinus Brutia Cone Dust
Sugözü, Banu
In this study, the usability of ulexite and pinus brutia cone dust (PBCD) in friction composites were investigated experimentally. Polymer-matrix composite (PMC) samples were manufactured by powder metallurgy method. Produced samples with the same contents were compared with those of heat-treated. A special design friction tester was used to determine friction properties such as wear rate and friction coefficient. The results showed that ulexite and PBCD can be used as filler material in friction composites. The results also indicated that heat treatment improved the properties of the samples.
Tribological Properties of Automotive Brake Pads Containing Peanut Shell Powder
Sugözü, Banu
In this study, the effect of peanut shell powder content on the tribological properties of automotive brake pads was investigated experimentally. Brake pads are intended to be resistant to environmental conditions such as abrasion, friction, temperature and humidity. Therefore, brake pads are formed by a combination of materials with many different properties. In this study, four brake pad samples containing different amounts of peanut shell powder were designed and produced. The added peanut shell powder is balanced with the filler in the content and the amount of other components was constant. Samples were produced by conventional dry mixing method. A special design brake tester with a gray cast iron disc was used to determine the wear and friction characteristics of the samples. All tes...
