| 摘要 |
FIELD: machine building.SUBSTANCE: invention can be used to improve operational characteristics of friction surfaces of railway wheels and for other purposes. Method of surface hardening of steel wheels of railway transport comprises application of boron-containing coating, which is a homogenised mixture consisting of phenol-formaldehyde resin with coke number in hardened condition of not less than 52 % (A), boric anhydride (B) and iron carbonyl (C) with ratio of A:B:C from 90:8:2 to 50:40:10, followed by two-step thermal treatment. At the first stage heating is performed by means of an infrared lamp to 200÷350 °C during 2÷8 minutes, and then at the second stage heating is performed by action of a gas-flame burner for 10÷30 minutes while ensuring coating temperature of 850÷1,000 °C.EFFECT: higher efficiency of penetration of boron-containing components, reduced temperature and time of saturation of steel surface of the wheel and simpler process due to application of coating, containing components in the form of a mixture homogenised to molecular dimensions.1 cl, 1 tbl, 1 ex |
