The Application of Fibers and Nanoparticles in the Form of Copper-Based Powder Sintered Friction Material with Lubricant Cooling

Resumo

The modern development of automotive engineering and special-purpose machines has led to the need to increase the energy loading of friction units and provide smooth switching on and pulling away, as well as to prolong the service lives of vehicles. Domestic experience in using hydromechanical gear-boxes and oil-cooling brakes indicates that sintered friction powdered MK-5 material, a sintered blend of tin bronze reinforced with graphite particles, has become the most widespread material for this purpose. In the present work, various fibers of glass, basalt and carbon have been successfully applied as friction-purpose fillers for enhancing the tribotechnical characteristics of the material. The effect of nanoparticles as filler of sintered friction material has also been studied. In particular, embedding aluminum hydroxide (bumite) nanoparticles increases the coefficient of friction, while intermetallides (aluminides of nickel, iron and titanium) decrease the wear rate.