Friction materials are applied for manufacturing the components operating in sliding friction, and have a high coefficient of friction. They are characterized by high frictional resistance to heat, low capacity for adhesion, good resistance to thermal shock, resulting from the intensive heat emission during friction.
Friction materials possess the highest possible thermal capacity and thermal conductivity.
These factors contribute to reduce the temperature of friction: heat capacity – due to the absorption of heat, thermal conductivity – due to its transferring from the surface of friction in the interior and then to the heat transfer surface. These materials are presented as requirements for corrosion resistance, running-in, technology, economy.
Friction materials are complex compositions of copper or iron base. The coefficient of friction can be improved by additive asbestos, carbides of refractory metals and various oxides.