NiCrSiB Thermal Sprayed Coatings Refused under Vibratory Treatment

  • Jelena ŠKAMAT Vilnius Gediminas technical University
  • Algirdas Vaclovas VALIULIS Vilnius Gediminas technical University
  • Krzysztof Jan KURZYDŁOWSKI Warsaw University of Technology
  • Olegas ČERNAŠĖJUS Vilnius Gediminas technical University
  • Raimonda LUKAUSKAITĖ Vilnius Gediminas technical University
  • Marta ZWOLINSKA Warsaw University of Technology
Keywords: thermal spray, NiCrBSi-system alloy coating, vibratory treatment, coating, and microstructure

Abstract

The influence of mechanical vibrations on microstructure and some properties of Ni-based thermally sprayed and fused coatings deposited on a steel substrate has been studied. Self-fluxing powder with about 67 % Ni was used as a sprayed material. As-sprayed coatings were refused using conventional flame technique and with introducing of mechanical vibrations. During investigation of coatings by different methods it was found that vibratory treatment influences the solidified microstructure, corrosion resistance, microhardness, and surface state. It was found that in addition to thin planar solidification layer, obtained near the interface in conventional coatings, vibrations promote the forming of relatively thick boride-free layer. Several possible mechanisms are presented. Corrosion resistance tends to be improved with increasing of amplitude or frequency of vibratory treatment. The application of vibrations in set range has also allowed reducing coatings roughness up to 3 times. Comparison of results showed that vibrations amplitude proved as more effective parameter of vibratory treatment.

DOI: http://dx.doi.org/10.5755/j01.ms.19.4.3386

Author Biographies

Jelena ŠKAMAT, Vilnius Gediminas technical University

PhD student

Department of Materials science and welding

Algirdas Vaclovas VALIULIS, Vilnius Gediminas technical University
Prof., Dean of faculty of Mechanics
Krzysztof Jan KURZYDŁOWSKI, Warsaw University of Technology
Prof., A head of Materials Design Division
Olegas ČERNAŠĖJUS, Vilnius Gediminas technical University

Docent of Department of Materials science and welding,

Vice-dean of faculty of Mechanics

Raimonda LUKAUSKAITĖ, Vilnius Gediminas technical University

PhD student

Department of Materials science and welding

Published
2013-12-11
Section
METALS, ALLOYS, COATINGS