Plasma transferred arc surface modification of atmospheric plasma sprayed ceramic coatings

ULUTAN M., KILIÇAY K., KAYA E., BAYAR İ.

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, vol.30, no.8, pp.3813-3818, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 8
  • Publication Date: 2016
  • Doi Number: 10.1007/s12206-016-0744-y
  • Journal Name: JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3813-3818
  • Keywords: Plasma welding, Atmospheric plasma spray (APS), Ceramic coating, Wear, WC-CO COATINGS, TRIBOLOGICAL BEHAVIOR, CR2O3 COATINGS, WEAR BEHAVIOR, MICROSTRUCTURE, FRICTION, STEEL
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

In this study, a 90MnCrV8 steel surface was coated with aluminum oxide and chromium oxide powders through the Atmospheric plasma spray (APS) and Plasma transferred arc (PTA) methods. The effects of PTA surface melting on the microstructure, hardness, and wear behavior were investigated. The microstructures of plasma-sprayed and modified layers were characterized by Optical microscopy (OM), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS). The dry-sliding wear properties of the samples were determined through the ball-on-disk wear test method. Voids, cracks, and nonhomogeneous regions were observed in the microstructure of the APS ceramic-coated surface. These microstructure defects were eliminated by the PTA welding process. The microhardness of the samples was increased. Significant reductions in wear rate were observed after the PTA surface modification. The wear resistance of ceramic coatings increased 7 to 12 times compared to that of the substrate material.