METHOD OF APPLYING TWO-LAYER ANTIFRICTION COATINGS ON WHEEL-RAIL TRIBOCONTACT SURFACE

摘要

FIELD: metallurgy.;SUBSTANCE: flame spraying of epoxy powder composition is carried out. Prior to flame spraying, first 0.01-3.0 mm-thick layer of coating is applied on metal surface by electric spark method, coating hardness exceeding that of metal to be protected, using the electrode of compacted mix of metal powder A and heat-resistant mineral powder B at the ratio of A:B=99:1-80:20. Thereafter said layer is treated by phosphating composition. Second layer is applied by powder flame spraying. Said powder consists of solid epoxy resin modified by fluorine rubber at stretch equipment with resin-rubber ratio of 97:3-70:30, imidazole hardener and filler composed of metal powder mix and antifriction mineral with high surface hardness. Powder is applied in layer of thickness varying from 0.5 to 3 mm and comprises the following components, in wt %: aforesaid solid epoxy resin modified by fluorine rubber - 100, imidazole hardener - 2-10, metal powder - 90-150, antifriction mineral - 0.4-12.;EFFECT: higher strength and adhesion.;1 cl, 2 tbl, 6 ex