Briefly analyses and friction materials together with the development of materials
Another type of friction material that was developed in parallel with organic friction materials and is more commonly used is the powder metallurgical friction material. in 1929 Schwarzkopf of the former USSR patented the first sintered material for friction, which was an alloy containing small amounts of lead, tin, and a copper base. the United States began this work in 1929, and the first use of this material was on clutch plates for the D-7 and D-8 Scrapers in the late 1930's. the material was used to make the clutch plates on the D-7 and D-8 Scrapers. The material was first used in the late 1930s in the clutch discs of the D-7 and D-8 scrapers. In 1932, General Motors organised the production of sintered materials for clutch discs, which were adopted by the aerospace industry at the time.
A more mature basic process principle in the field of powder metallurgy friction materials was embodied in a patent obtained by Wilmer and his colleagues in the USA between 1937 and 1941. The patent uses tin bronze as the metal matrix for the friction material, which can be supplemented with zinc for alloying. Iron and silica were added to increase the coefficient of friction, and graphite and lead were added as lubricating components.
Some time around 1950-1980, powder metallurgy friction materials were successfully used in dry and wet friction workplaces. The field of application was expanded to include brakes and clutches for medium and heavy vehicles, agricultural machinery and so on. Since 1958 the British company Frood has been producing bronze-, iron- and ceramic-based friction materials in co-operation with the American companies S.K. Wellman and Bendix Aerospace.
