Kratka analiza materialov, razvitih skupaj s tornimi materiali
At the same time as the development of organic friction materials, another type of friction material that is more commonly used is powder metallurgy friction materials. Before 1929, the Soviet Union's Schwarzkopf applied for the first patent for a sintered material for friction. The material was an alloy containing a small amount of lead, tin and copper. The United States also started the research of this work in 1929. In the late 1930s, the material was first used on the clutch plates of D-7 and D-8 scrapers. The American General Company organized the production of sintered materials for clutch plates in 1932, which was adopted by the aviation industry at that time.
Bolj zrelo osnovno načelo procesa na področju tornih materialov prašne metalurgije je utelešeno v patentih, ki so jih Willman in njegovi kolegi pridobili v Združenih državah med letoma 1937-1941. Ta patent uporablja kositrni bron kot kovinsko matrico tornega materiala, kositrni bron pa je mogoče legirati s cinkom. Za povečanje koeficienta trenja sta dodana železo in silicijev dioksid, kot mazalni komponenti pa grafit in svinec.
Približno v obdobju med 1950-1980 so bili torni materiali prašne metalurgije uspešno uporabljeni na delovnih mestih s suhim in mokrim trenjem. Njegova področja uporabe so razširjena na zavore in sklopke za srednja in težka vozila, kmetijske stroje itd. Od leta 1958 British Frood Company sodeluje z ameriškim podjetjem SK Wellman Company in Bendix Aviation za proizvodnjo brona-na osnovi železa{ {4}}torni materiali in materiali na osnovi keramike.