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...

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

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.

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.

Otomotiv fren balatalarında farklı bağlayıcı malzeme kullanımının frenleme performansına etkisinin araştırılması

Kahya, Kürşat

Effect of process for manufacturing a brake lining on tribological properties: an experimental study for hot pressing pressure

Sugözü, Banu | Sugözü, İlker

Production of composite brake linings; mixing, cold and hot pressing (molding) and heat treatment steps. The aim of this study is to investigate the effect of hot-pressing pressure on friction performance in the production of composite brake linings. As the pressure applied during the hot-pressing step increases, the density of the product increases as the gap between the materials forming the product decreases. Therefore, the pressing pressure, which is one of the production parameters, is very important for the friction performance of composite brake lining materials. In this study, composite brake lining samples having the same content were produced by applying three different hot-pressing pressures such as 8000, 13000, 18000 kPa and friction performances were examined. The friction coe...

Effect of the size on the friction characteristics of brake friction materials: a case study with Al2O3

Sugözü, Banu

Purpose The purpose of this paper is to study the potential of alumina (Al2O3) in nanometer size in automotive brake friction materials. Design/methodology/approach Four brake linings containing alumina differing in particle size (355 µm and 80 nm) and various amount (5 and 10 Wt.%) were designed and produced. The hardness, density and porosity of the samples were measured. All samples were tested on a full-scale brake dynamometer with gray cast iron disc to determine the tribological properties. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings It was concluded that all performance parameters were beneficially affected because of nano alumina. Originality/value This paper emphasizes the importance of nano-composites in the automotive in...

Investigation of Friction and Wear Behavior of Boron Carbide Reinforced Composite Materials

Sugözü, Banu | Sugözü, İlker

In this study, the usability of boron carbide as a reinforcement material in friction composites was investigated experimentally. Hence, composite samples containing different amounts of boron carbide (5%, 10% and 15%) were produced and compared with boron carbide-free sample. Friction and wear tests were determined by a full scale brake friction tester according to TS 555 and TS 9076 standards. The hardness of the samples was calculated by Rockwell hardness tester and the density was calculated according to Archimedes' principle. The results showed that boron carbide could be used as a reinforcement material in friction composites.

Investigation of the Effect of Surface Roughness on Friction Performance of Brake Pad

Sugözü, Banu | Sugözü, İlker

Vehicle brake pads are produced by combining more than one material. Having different properties of the material forming the brake pad composition is affect to the friction performance of the vehicle. During braking, high temperatures occur in the vehicle brake pads. Depending on the temperature change, the friction coefficient and wear resistance of the brake pad are desired to be high. In this study, the effect of brake pad surface roughness on friction performance was investigated. The friction coefficient and wear tests of the brake pads with different surface roughness values were examined and their effect on the friction performance was determined.

The effect of colemanite on the friction performance of automotive brake friction materials

Sugözü, İlker | Sugözü, Banu

Purpose 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 ...

Otomotiv fren balatası sürtünme test cihazı tasarımı ve imalatı

Yüce, Selvi

INVESTIGATION OF ULEXITE USAGE IN AUTOMOTIVE BRAKE FRICTION MATERIALS

Sugözü, Banu

The automotive brake pads are multi-component composites made up of many materials. There are many studies in the literature exploring the use of many different materials in brake pads. In this study, the use of ulexite which is a commercially valuable derivatives of boron that 65% of the total world reservations exists in Turkey were researched for brake pad material. For this purpose, three brake pad specimens containing ulexite differing in amount (3, 6 and 9 wt.%) were produced by a conventional procedure for a dry formulation following dry-mixing, pre-forming and hot pressing. The density of the specimens was determined based on Archimedes principle in water. The surface hardness of all brake pad specimens was measured using Rockwell hardness tester. The friction performance of the br...

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...

Taşıt fren balatalarında katı yağlacı olarak grafit, molibden disülfit ve Boron nitrit kullanımının frenleme performansına etkisinin araştırılması

Çalışkan, Hasan

Investigation of Usage of Milled Pine Cone in Brake Pads

Sugözü, İlker | Sugözü, Banu

Automotive brake pads are polymer composites containing polymer matrix and various fibers and obtained by mixing and pressing different powder materials. Each material added to the content has one or more tasks. Therefore, the properties and quantities of the materials added to the content are very important in terms of braking performance. In this study, the use of milled pinus brutia cone and pinus nigra cone from the pine cone family in the automotive brake pad was investigated experi-mentally. First of all, cones are ground and powdered. The milled 10% pinus brutia cone and 10% pinus nigra cone were added to the pad com-ponent. The performance tests of the pads were carried out on pin on disk type test device. Friction coefficient, wear, density and hardness tests of the pads were done...