LEAD-FREE BRUSH GRADE FOR HIGH TEMPERATURE APPLICATIONS

摘要

Sliding contact element for electric motors working with high current densities, such as gear reduced starters, comprising copper particles, black mix particles that result from milling a mixture of graphite particles and organic binders, containing also as lubricant additives one or more lead-replacing metals or compounds thereof, typically tin, zinc, bismuth, manganese, their oxides or their carbonates, characterized in that it also comprises a solid lubricant that has a decomposition temperature in air higher than 450°C, such as tungsten disulphide or boron nitride.