Automatic Welding, 2017, №09



2017 №09 (03)

DOI of Article 10.15407/as2017.09.04

2017 №09 (05)

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Avtomaticheskaya Svarka (Automatic Welding), #9, 2017, pp. 23-32
 

Features of the structure of plasma-arc coatings produced at application of flux-cored wires with a steel sheath and filler from B₄C AND ZrO₂ nanopowder

G.M. Grigorenko, L.I. Adeeva, A.Yu. Tunik, V.N. Korzhik and L.M. Kapitanchuk

E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03150, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
Features of the structure of coatings made by high-speed plasma-arc spraying of wire with a steel sheath and B₄C powder filler with addition of nanosized ZrO₂ powder were studied. Coatings with low porosity (about 1 %), lamellar structure and high hardness were produced on a low-carbon steel substrate. Processes of interaction, running in plasma-arc spraying between the sheath, making up 90 wt.% of the wire, and the filler, were analyzed. Ferrite matrix of the coating is alloyed with boron and carbon, and contains an amorphous phase. It is strengthened by dispersed carbide, borocarbide and oxide particles. Addition of 0.5 % of ZrO₂ nanopowder promotes refinement of the coating structure with formation of dispersed borocarbides Fe₃(B, C), Fe(B, C)₂, and oxides of iron FeO and boron B₃O₅. Coating microhardness reaches 6.86 GPa that is 4 times greater than that of the ferrite sheath. Coatings of this class can be applied as wear-resistant ones for protection of equipment from gas-abrasive wear in chemical engineering, in manufacturing parts of pumps, compressors and other items, as well as reconditioning worn parts. 22 Ref., 7 Tables, 7 Figures.
Keywords: plasma-arc spaying, flux-cored wire, carbide filler, nanopowders, phase transformation, lamellar structure, dispersed strengthening of coatings, iron boro-carbide, microhardness
 
Received:                07.04.17
Published:               10.10.17
 
 
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