Increase of quality of strengthening coatings

Abstract

The features of forming of the restoration coverages on the basis of nickel, got the flame
spraying by a brush instrument combined with tooling on steel basis, are analyzed. It is shown that
tooling creates unfolded microrelief on the surface of basis, providing forming of reliable adhesive
bond between coverage and basis. Application of a brush treatment in the process of forming of
coverage provides the increase of their closeness, decline of porosity as in coverage so on a border
coverage is basis. Destruction of oxydic tapes on separate particles, in the process of forming of
coverage a metallic brush provides the meltback of metallics and their connection under the action of
forces of Van-der-Waals, providing of increase of cohesive durability of coverage. There is an
increase in the hardness of the sprayed surface layer, a decrease in the microhardness of the
subsurface layers, and an increase in hardness in the deeper layers of the coating. The fine particles of
oxides appearing in the coating play the role of additional centers of crystallization, a fine-grained
structure of the coating is provided. Mechanical treatment with a brush tool is proposed as a method
of preparing the surface before gas flame coating and coating layers treatment during its formation.