METHOD OF MAKING COMPOSITE COATINGS BY COAXIAL LASER SURFACING

摘要

FIELD: metallurgy.SUBSTANCE: part surface to be built up is cleaned, flushed and jet blast to roughness to ensure required coating adhesion and compressed air blowing. Part surface adjoining buildup area are additionally cleaned and flushed. Powder material is prepared and fed by two proportioners to part surface buildup area by argon flow for surfacing by pulse laser beam in argon medium. One proportioner feeds reinforcing nonmetallic dispersed powder of sintered tungsten carbide in 80.0-150.0 mcm-fraction while another one feeds metallic powder of cobalt alloy B3K in 53-106 mcm-fraction. Surfacing is performed in at least two layers by 2 kW laser beam at its displacement at 2 m/min. In first layer buildup, tungsten carbide powder and cobalt alloy powder are fed at 1:4 ratio while in second layer buildup said ratio makes 1:5.EFFECT: higher wear resistance, adjustable coating thickness.5 cl, 2 tbl, 1 ex