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

Abstract

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 industry and helps industrial firms and academicians working on wear of materials.

Effect of zirconium silicate and mullite with three different particle sizes on tribo performance in a non-asbestos brake pad

“…More compressibility and uniform distribution of the finer particles than the medium or coarser particles were attributed to the decreased porosity. 24…”

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

“…It has been proved by studies [21,[30][31][32][33][34][35][36]] that the type, particle size, shape and amount of the materials constituting the composite directly affect the friction and wear properties. Accordingly, the properties of the materials and the previous studies were taken into consideration while creating the composite content.…”

“…In the studies [5][6][7][8][9][10][11][12][13][14][15][16][17], the usability of materials such as aramid fiber, carbon fiber, metal fibers, palm kernel fibers, glass fiber, fly ash fiber, sisal fiber, stone wool fiber and organic fiber as a reinforcement material was investigated experimentally. Necessary tests have been carried out using various materials such as waste vehicle dust, alumina, fly ash, banana peel, powdered pine cone and steel wool as the friction regulator [18][19][20][21][22][23]. In addition, studies on the use of boron products in friction composites [24][25][26][27][28][29] are relatively limited.…”

Investigation of Usage of Milled Pine Cone in Brake Pads

“…where, V is the specific wear rate (cm 3 /Nm), Rd is the distance between centers of the sample and the rotating disc (m), m1 and m2 are the average specimen weights before and after the test (g), respectively, n is the rotating number of disk, ρ is the density of the brake lining (g/cm 3 ) and fm is the average frictional force (N). The density of the produced pads was determined by the formula given in Equation 2 according to the Archimedes principle [24]. In the equation; ρ is density (g/cm 3 ), mh is mass of the sample in air (g) and ms is mass of the sample in water (g).…”