Abrasive Wear Resistance and Tribological Characteristics of Electrometallized Composite Coatings.

We investigate coatings sprayed by the electric-arc method from solid and powder wires, and study their structure, mechanical properties, and tribological characteristics. The drops of the powder and solid wires are present in the coatings obtained from heterogeneous wires. The structure of the coating consists of two different frames, namely, of the soft matrix of solid wire (150–450 HV100) and of the hard matrix of powder wire (600–1000 HV100). Under the conditions of boundary friction, a friction couple formed by a (Fe–Cr–B) + Sv08 powder wire and a BrS-30 counterbody has the best tribological characteristics. The elevated wear resistance of the coatings is explained by the presence of large amounts of iron and boron oxides. We analyze the properties of the coatings under the conditions of boundary friction. The friction coefficient of steel increases from 0.018 under 1 МРа to 0.038 under 10 Ра. This is higher than for a friction couple formed by a coating sprayed from Sv08 and PW (Fe–Cr–B) electrode wires and BrS-30 by 50–70%. The abrasive wear resistance of the coatings sprayed from composite wires with fixed abrasive becomes 2.1 times higher as compared with ShKh15 steel. [ABSTRACT FROM AUTHOR]