Aspects of the formation of a nitrogen-modified layer upon the ion-beam treatment of hypersonic thermal spray coating of austenitic steel

Resumo

The effect of the ion-beam nitriding of a hypersonic thermal coating made of steel wire STT 06Kh19N9T of austenitic grade on the phase composition and structure of the nitrided layer is investigated. The distribution of nitrogen atoms in the surface coating layer is studied. It is found that sputtered particles with a relatively small oxide-layer depth are characterized by an elevated concentration of the dopant and microhardness. A model is proposed that relates the concentration inhomogeneity of the distribution of the dopant in the sputtered particles of the coating with the diffusion impermeability of oxide layers located on the edges of the sputtered particles.