Sliding and Rolling Wear Behavior of HVOF-Sprayed Coatings Derived from Conventional, Fine and Nanostructured WC-12Co Po
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JTTEE5 23:262–280 DOI: 10.1007/s11666-013-0038-1 1059-9630/$19.00 ASM International
Sliding and Rolling Wear Behavior of HVOF-Sprayed Coatings Derived from Conventional, Fine and Nanostructured WC-12Co Powders W. Tillmann, I. Baumann, P. S. Hollingsworth, and L. Hagen (Submitted June 6, 2013; in revised form October 17, 2013) Fine structured and nanostructured materials represent a promising class of feedstock for future applications, which has also attracted increasing interest in the thermal spray technology. Within the field of wear protection, the application of fine structured or nanostructured WC-Co powders in the High Velocity Oxy-Fuel flame spraying technique (HVOF) provides novel possibilities for the manufacturing of cermet coatings with improved mechanical and tribological characteristics. In this study the tribological behavior of HVOF sprayed coatings derived from conventional, fine and nanostructured WC-12Co powders under sliding and rolling wear are investigated and the results are compared to C45 steel (Mat.-No. 1.0503). In addition, sliding and rolling wear effects on a microscopic level are scrutinized. It has been shown that under optimized spray conditions the corresponding fine and nanostructured WC-12Co coatings are able to obtain higher wear resistances and lower friction coefficients than the conventional coatings. This can be attributed to several scaling effects of the microstructure and to the phase evolution of the coating, which are discussed.
Keywords
HVOF, Nanostructured coatings, Fine structured coatings, WC-Co, Wear effects, Wear resistant coatings, Wear testing, Scaling effects
1. Introduction It is well known that wear has a great impact on the performance, reliability, safety, and economy of manufacturing processes because it does not only determine the lifetime of tools or other machine components but also decisively affects the quality of the products. Wear naturally arises when functional parts underlie tribological interactions with another counter body as well as intermediate and / or ambient media. Wear represents an important system property, which depends on the configuration of the tribological system and the way, the material is removed (wear mechanisms). During a manufacturing process the successive wear-related material removal leads to a significant alteration of the geometrical, This article is an invited paper selected from presentations at the 2013 International Thermal Spray Conference, held May 13-15, 2013, in Busan, South Korea, and has been expanded from the original presentation. W. Tillmann, I. Baumann, P.S. Hollingsworth, and L. Hagen, Institute of Materials Engineering, Faculty of Mechanical Engineering, Technische Universita¨t Dortmund, LeonhardEuler-Str. 2, 44227 Dortmund, Germany. Contact e-mails: [email protected] and [email protected].
262—Volume 23(1-2) January 2014
structural and the strength properties of the functional parts. These alterations and the intermediate medium thereby incurred are the reaction of the material a
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