SCHUBERT Jan

Spoluautoři SMAZALOVÁ Eva, HOUDKOVÁ Šárka, ČESÁNEK Zdeněk, PRANTNEROVÁ Michaela

Methodology of remelting thermally sprayed coatings is one of optional subsequent processing which is capable of sealing surface porosity without using additives like polymers. One of its main advantages is ability to further improve the mechanical and corrosion properties of thermally sprayed coatings. The benefits derive from positive influence on the microstructure of the coating and removing inhomogeneities introduced into the coating during thermal spraying process. Methodology of remelting coatings prepared by thermal spraying allows to reduce the inhomogeneities and reduce the amount of porosity contained in the resulting coating, or to eliminate it entirely. The paper presents the results of evaluation of the mechanical properties of samples of coatings based on alloy NiCrBSi. Samples were prepared by thermal spray technology (HVOF and FS) and remelted by standard methods (flame remelting, remelting by resistance, remelting in furnace). The resulting coatings were tested by ASTM G65 (abrasion wear resistance), ASTM G99 (Pin-on-disc), along with measurements of basic mechanical properties (HR15N, HV0.3, roughness). The microstructure of these samples was evaluated by optical microscopy.

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