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AssigneesA/S Roulunds Fabriker, Volvo Truck Corporation
InventorsOle Kr.ae butted.mer, Niels Brams.o slashed., Erik Simonsen, Noel De Leon, Knud Strande, Rolf Tornberg, Claes Kuylenstierna
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A friction material comprising a sintered mass of iron in which graphite particles are dispersed, which sintered mass is formed from between 13 and 22 vol. % of iron fibers, between 13 and 22 vol. % of iron particles having a particle size of 10-400 .mu.m, between 40 and 70 vol. % of graphite particles having a particle size of 25-3000 .mu.m, and between 10 and 15 vol. % of a metallic binder having a melting point of 800-1140.degree. C., and a method of preparing such a friction material, wherein a mixture of these components is compressed at a pressure of at least 100 MPa so as to form a compact having a desired form and size, and where the compact thus formed is sintered at a temperature between 800 and 1140.degree. C. for a period of time which is sufficiently long for achieving concretion of iron fibers, iron particles and metallic binder.
A friction material comprising a sintered mass of iron in which graphite particles are dispersed, the sintered mass comprising from between 13 and 22 vol. % of iron fibres, between 13 and 22 vol. % of iron particles having a particle size from 10 to 400 .mu.m, between 40 and 70 vol. % of graphite particles having a particle size from 25 to 3000 .mu.m, and between 10 and 15 vol. % of a metallic binder having a melting point from 800 to 1140.degree. C.
A friction material according to claim l, wherein the iron fibres have a length from 0.5 to 5 mm and a thickness from 10 to 100 .mu.m.
A method of preparing a friction material in the form of a sintered mass of iron in which graphite particles are dispersed, comprising the steps of compressing a mixture comprising 13-22 vol. % of iron fibres, 13-22 vol. % of iron particles having a particle size between 10 and 400 .mu.m, 40-70 vol. % of graphite particles having a particle size between 25 and 3000 .mu.m, and 10-15 vol. % of metallic binder at a pressure of at least 100 MPa so as to form a compact having a desired form and size, and sintering the compact thus formed at a temperature between 800 and 1140.degree. C. for a sufficiently long period of time to achieve concretion of iron fibres, iron particles and metallic binder.
Dependencies are inferred from the claim text.