COMPOSITE MATERIAL FOR FRICTION CLUTCH OF SWITCH ELECTRIC DRIVE Russian patent published in 2021 - IPC C22C33/02 C22C38/16 B22F3/12 B22F7/00 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to powder metallurgy, namely, a composite sintered material based on iron for a friction clutch of a switch electric drive. The material contains silicon oxide, graphite, copper, barite, zinc stearic acid and iron at the following ratio, wt.%: silicon oxide 2-5, graphite 2-5, copper 8-13, barite 0.5-1.5, zinc stearate 0.1-0.5, iron the rest. The material has open porosity of 25-30%, Brinell hardness of 350-450 MPa, density of 5.00-5.25 g/cm³, a relative immersion depth of at least 12% and oil absorbency of 2-5% of the volume of the material. The iron matrix of the material has a coarse-grained structure with a grain size of 10-210 mcm, at least 70% of which have a size of 25-75 mcm, consists of lamellar perlite with inclusions of up to 20% of granular perlite, has intergranular and intragranular porosity. Inclusions of graphite, silicon oxide, sulfides and copper which is also distributed inside the grains are distributed along the grain boundaries.

EFFECT: invention provides a reduction in the run-in period and an increase in the stability of the friction coefficient when loading conditions change.

1 cl, 6 dwg