Investigation of The Effect of Solid Lubricant Particle Sizes on Friction and Wear Properties in Friction Composites: An Experimental Case Study with Graphite

Abstract

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. Two brake lining were prepared containing 10 wt.% nanographite and micrographite, were produced by powder metallurgy technique. The brake lining samples have been tested under Friction Assessment and Screening Test (FAST). The frictional and physical properties of the produced samples were determined by appropriate tests. According to the test results obtained, micro and nanoparticle size were compared in many respects and the most ideal size was determined for graphite.

Transfer film formation and dissipation and its effect on friction coefficient in NAO friction materials containing FeS2 lubricant

“…For this reason, many attempts have been made to improve friction properties by controlling the composition and content of lubricants (John and Menezes, 2021). In industry, FeS 2 is frequently used (Sugözü and Sugözü, 2021; Makoto Miyajima et al 2016). The component is very cheap, easy to obtain and has lubricating properties when used properly in friction material manufacturing.…”

Effect of limestone usage on tribological properties in copper and asbestos-free brake friction materials

“…Fillers are used to reduce costs and increase thermal stability (Öktem and Uygur, 2019). Researchers frequently use barite as a filler material due to its positive effect on brake friction materials (Singh, 2021a; Sugözü and Sugözü, 2021). Researchers have reported that different fillers other than barite also increase friction performance.…”

Comparative Studies on the Dry Sliding Behavior of a Low-Metallic Friction Material with the Addition of Graphite and Exfoliated g-C3N4

“…This is due to their lamellar structure, which assists in the formation of a robust friction/transfer layer on the mating surfaces with strong adhesion [19][20][21][22]. The metal sulfides can either be used individually or can be added in a mix in the composition [23]. Graphite is primarily known for its good lubrication characteristics, high thermal conductivity, reduction in excessive wear of contact surfaces by contributing towards the formation of the friction/tribo-layer, high damping, and superior seizure resistance [6,24].…”