METHOD OF DEPOSITING ANTIFRICTION COATINGS ON SIDE SURFACE OF RAILS Russian patent published in 2014 - IPC C23C28/00 C23C26/00 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: method involves preliminary deposition of rough layer with thickness of 0.01-3.0 mm on a metal surface using an electrical discharge method, followed by deposition of an antifriction layer. Electrical discharge deposition is carried out using electrodes made of medium- and high-carbon steels, and the antifriction layer is deposited with a paint gun with thickness of 0.5-1.5 mm using a composition consisting of mineral oil or a mixture of mineral oils based on saturated hydrocarbons, modified with nanoparticles of iron, formed during thermal decomposition of liquid iron pentacarbonyl, which is premixed in the medium of oil in a reactor with mixer rate of 1000-2500 rpm for 30-120 minutes, followed by feeding a ternary mixture of powdered filler into said reactor while mixing, said mixture consisting of graphite (A), molybdenum disulphide (B) and tetrafluoroethylene polymer (C) in ratio A:B:C from 40:40:20 to 80:10:10. Said composition contains the following, pts.wt: mineral oil or mixture of mineral oils 100, iron nanoparticles 0.3-4.0 and ternary mixture of powdered filler 15-60.

EFFECT: prolonged antifriction action of the deposited coating.

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