Bu çalışmada ülkemizde kullanılan otomobillere ait yerli ve yabancı olmak üzere 3 adet fren disk balatasının bileşenleri; aşınma-sürtünme karakteristikleri, mekanik ve fiziksel özellikleri açısından deneysel çalışmalarla incelenmiş, yerli, yabancı ve orijinal (OEM) olanların birbirleri ile çevre ve kullanım açısından karşılaştırılmaları yapılmıştır. Kimyasal analizlerde, tarama elektron mikroskobu EDS sistemi ve XRF kullanılmıştır. Balata malzemelerinin sıcaktaki kütle kayıplarını belirlemek için TG (Termo Gravimetrik) analizleri yapılmıştır. Ayrıca ısısal değişiklikleri tespit amacıyla DT (Diferansiyel Termal) analizleri gerçekleştirilmiştir. Balataların aşınma sürtünme testleri JIS 4411 standardına göre yapılmıştır. Bunların dışında balataların sertlik, yoğunluk, iç kesme dayanım değerleri ölçülmüştür. Deneysel veriler yabancı ve yerli balatalar için çevre ve kullanım açısından karşılaştırılmıştır.

Brake linings are a key brake part because they are the component that contacts and applies pressure and friction to a vehicle’s brake rotors– – those flat, shiny discs that you can sometimes see just behind the wheels of some vehicles. The pressure and friction applied to thebrake rotor is what slows and stops the wheel. Once the wheels stop turning, the vehicle stops moving, too. Though the role of brake liningsas braking parts is pretty simple, the brake linings themselves are anything but. If the car in motion cannot be stopped, there may be situationsthat could lead to loss of life and property. For this reason, the most important system in terms of safety of life and property in roadvehicles such as automobiles is brake system. The most important part of the brake mechanism, which provides friction to the vehicle byslowing down, is the brake lining. Brake linings must be at an acceptable cost proportional to a balanced coefficient of friction, low wearrate, low noise level, lightness, environmental damage, good mechanical strength, corrosion resistance and performance. High temperatureduring braking; fading phenomenon, premature wear, evaporation of brake fluid, bearing failures, thermal cracks and thermally inducedvibrations. Brake decline is a decrease in stopping power, especially in overload or repeated braking situations in high speed conditions.Brake weakening is a phenomenon that occurs due to temperature in vehicles such as cars, trucks, motorcycles, planes and bicycles thathave a friction wheel. Proper driving style, brake equipment, material design and choice are factors that can significantly affect brake attenuation.Brake pads were formerly manufactured using mainly asbestos as the friction material. That’s because brake pads are exposed to[Açıklamalar]a lot of friction, which generates a lot of heat. Asbestos is a good material for absorbing and dissipating heat. So what was theproblem? When asbestos breaks down, it’s creates dust that’s dangerous to breathe – – and brake pads can create a lot of brake dust whenthey’re slowing and stopping vehicles on the roads. Now, some brake pads and other brake parts are made from safer organic materials.Organic brake pads, sometimes called nonasbestos organic brake pads, are made from natural materials liked glass and rubber, as well asresins that can withstand high heat.All these features can be provided by composite brake linings containing many different components. These components are used as binders(phenolic resins and rubber), as abrasives (steel, copper, brass, aramid, potassium titanate, rock wool, glass fiber), abrasive (zirconiumsilicate, aluminum oxide, SiO2), fillers (barium sulphate, calcium carbonate, vermiculite), as a lubricant and as a friction modifier(graphite, petroleum coke, molybdenum sulfur, antimony trioxide, zinc sulphide). For a composite brake lining, at least 10 of the above components are used in different quantities to produce pillars withvery different compositions and performances. Brake linings,which are mainly produced by powder metallurgy, are obtained bypassing through mixing, molding and sintering steps. The materialsthat make up the lining material are first mixed homogeneously fora certain period of time. This mixture is then pressed into the moldin the shape of a lining at a certain pressure, temperature and time.After pressing, the mixture, which has been shaped like a mold, issubjected to heat treatment in a sintering furnace at a certain temperatureand for a certain period of time. After the heat treatment,the cooled sample of the lining becomes ready for the pre-use tests.Composite brake linings are important safety elements used in frictionbrake systems. Composite materials in brake linings; metallic,semi-metallic, composite and carbon based. Some performancecharacteristics of composites such as friction coefficient and wearin brakes and clutches are the complex functions of matrix componentsand compound components that the process cannot ignore.In this study, the components of 3 disk brake linings, local and foreign,belonging to automobiles used in our country; abrasion-frictioncharacteristics, mechanical and physical properties of thesematerials were investigated by experimental studies and comparedwith those of local, foreign and original (OEM) in terms of environmentand usage. In chemical analyzes, scanning electron microscopyEDS (energy dispersive X-ray analysis) system and XRF(X-ray fluorescence spectrometry) were used. TG (Thermo Gravimetric)analyzes were performed to determine the mass losses inthe disc brake lining materials. In addition, DT (Differential Thermal)analyzes were performed to detect the thermal changes. Wearfriction tests of linings were made according to JIS 4411 standard.Apart from these, the hardness, density and internal shear strengthvalues of the linings are measured. The experimental data are comparedfor the environment and use for foreign and local linings.