İlker Sugözü

The Effect of Borax on the Friction Performance of an Automotive Brake Lining

Abstract In this study the effect of refined boron product borax on friction and wear performance of various brake friction couples were investigated. Different amounts of borax were used in the mix with other regular ingredients in the respective brake pad. Newly formulated brake pad material with nine different ingredients was tested using friction assessment and screening test (FAST). Among such specimens, only half of the samples (shown with H indices) were heat treated for 4 h at 180 °C. The friction coefficient as well as the wear rate were determined and the friction surfaces were examined by scanning electron microscope (SEM) to assess the performance of these samples. The heat treated sample that was reinforced with 12 % borax exhibited the optimum friction and wear behaviour. With increasing friction surface temperature, a reduction of the friction coefficient of the samples was observed. The lowest reduction of the friction coefficient was observed the 8 % and 12 % borax reinforced and heat treated samples.

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

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 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 indi...

Friction behavior of granite powder added brake pads

Abstract Brake linings used in automotive disks are usually composed of various components. The expected properties of a brake lining are the standard values of wear resistance, friction coefficient and the economical manufacturing. Brake lining extremely warms up during braking due to friction. The braking performance of braking lining can change or the braking lining undergoes mechanical deformation due to excessive temperature. In this study, the effect of granite powder in the brake friction material on various aspects of friction characteristics were investigated. Three friction material specimens were produced based on an experimental formulation, and they contained 2, 6 and 10 % granite powder, respectively, with fixed composition of the other ingredients. Tribological properties of the friction materials were obtained using a brake dynamometer. Results showed that the friction materials containing 2 and 6 % granite powder had improved friction stability and fade resistance.

Investigation of using Calabrian pine cone dust and borax in brake pads

Purpose – The purpose of this paper is to investigate use of calabrian pine (pinus brutia) cone (CPC) dust along with borax (BX) to assess the effect of friction coefficient. Despite the number of research studies completed on the mechanism of friction in automotive brake lining materials, the phenomenon is still not fully understood. Complex mechano-chemical processes occurring on the friction interface of a composite friction material make it difficult to understand the correlation between the formulation of brake lining and the frictional performance. Design/methodology/approach – In this study, the use of CPC dust along with BX has been investigated for assessing the effect on friction coefficient. CPC has resin in it. BX is a boron production which is widely used in boron glass production and in ceramic industry for increasing the heat- resistant and -forming abrasion resistant. Newly formulated brake lining material with five different ingredients has been tested under Friction Assessment and Screen...

The Influence of Diesel Fuel-biodiesel-ethanol-butanol Blends on the Performance and Emission Characteristics of a Diesel Engine

In this study, performance and exhaust emissions of a diesel engine fueled with Fuel A (60% diesel–30% biodiesel–5% ethanol–5% butanol) and Fuel B (40% diesel–50% biodiesel–5% ethanol–5% butanol) were investigated. The biodiesel produced from trap grease was obtained with an oil separator. Fuel A and Fuel B were tested in a single cylinder, four-stroke diesel engine at full load conditions. Compared with diesel fuel, the performance characteristics of blend fuels slightly deteriorated while the emission characteristics improved significantly. CO and HC emissions decreased by 87.01 and 87.50%, respectively.

The effects of porosity in friction performance of brake pad using waste tire dust

This research is focused on the effect of porosity on the friction-wear properties of automotive brake pads. Waste Tire Dust (WTD) was used as a new friction material in brake pads. Newly formulated brake pad materials with five different components have been produced by conventional techniques. In the experimental studies, the change of the friction coefficient, the temperature of the friction surface, the specific wear rate, and the hardness, density and porosity were measured. In addition, the micro-structural characterizations of brake pads are determined using Scanning Electron Microscopy (SEM). The mean coefficient of friction, porosity and specific wear are increased due to a WTD rate increases, on the other hand, hardness and density are decreased. As a result, WTD can be considered as an alternative to revalorize this kind of waste products in the brake pads and the amount of porosity of the brake pad affected the friction coefficient and wear behavior of the pad.

Investigation of using rice husk dust and ulexite in automotive brake pads

Abstract In this study, the use of rice husk (RH) dust in addition to ulexite (UX) has been investigated for estimating the effect on friction coefficient. RH includes silica which gives the pad materials a ceramic like behavior. To obtain RH, rice husk was grained after it had been dried. Different amounts of RH were included in the brake pad mix in addition to the other regular components. UX is a boron mineral which is widely used in boron glass production and in ceramic industry for increasing heat resistance and abrasion resistance. The newly formulated brake pads have been tested by the friction assessment and screening test (FAST). The friction coefficient and wear rate have been determined and investigations by scanning electron microscope (SEM) of the friction surfaces have been carried out to estimate the performance of these samples.

Experimental investigation of effect of stratified charging system adopted to gasoline engine running with LPG on engine performance

AbstractThe energy conversation and values of limited emission level are very important issue for manufacturers and engine designers. Therefore the investigations about homogeneous charge engine and stratified charge (SC) engine have commonly been considered by the literatures. Homogeneous charge engines run with stoichiometric mixture, and SC engines run with lean mixture. The main purpose of this study, in order to run with poor mixture of gasoline engine like diesel engine, the shape of charge was converted to SC and used liquid petroleum gases (LPG) fuel. In this point of view, LPG–air mixture is prepared in two different environments and rates, and the mixture was taken into the engine as stratified by two steps. The effects of engine performance, fuel consumption and emission characteristics are investigated for SC application. The experiments were made under full load and full throttle position. According to the results of the experiments, both the engine power and torque did not change and the fue...

The effect of using heat treated ulexite and cashew in automotive friction materials

Abstract In this experimental study, the use of heat treated ulexite and cashew as a new material in brake pads was investigated. The change of friction coefficient, the temperature of friction surface and amount of wear were examined to assess the performance of these samples. Additionlly, microstructural characterizations of braking pads were carried out using scanning electron microscopy. The results showed that the heat treated samples containing ulexite and cashew have an important effect on friction stability and fade resistance. It can be concluded that heat treated ulexite and cashew can be used as friction materials in the automotive brake pads.