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Abstract

The present contribution deals with the influence of tribological conditions on coating quality. Two types of coatings were selected for analysis WC-WB-CO and WC-FeCrAl, to advise that a new type of coating - carbide green. These coatings were applied to the base material AISI 316L of technology HVOF – High velocity oxygen fuel. The aim of the experimental study was to determine the quality coatings and its resistance to abrasive wear, depending on the number of thermal cycles. It was evaluated hardness, thickness, the resistance to abrasive wear in free abrasives and firmly bonded abrasives. Results of experiments showed a higher resistance of the coating WC-Co-WB.

REFERENCES 1. Brezinová J., Landová M., Guzanová A., Dulebová Ľ., Draganovská D.: Microstructure, Wear Behavior and Corrosion Resistance of WC–FeCrAl and WC–WB–Co Coatings. Metals 2018 , 8(6), 399. 2. Bolelli G., Hulka I., Koivuluoto H., Lusvarghi L., Milanti A.: Properties of WC–FeCrAl coatings manufactured by different high velocity thermal spray processes. Surf. Coat. Technol . 2014 , 247, 74–89. 3. Hulka I., Utu D., Serban V.-A., Dan M.-L., Matikainen V., Vuoristo P.: Corrosion Behavior of WC–FeCrAl Coatings Deposited by HVOF and HVAF Ther mal Spraying

. Experimentálne hodnotenie adhézneho opotrebenia povlakov na báze WC-FeCrAl , Novus Scientia:Košice, 105–109, 2016. ISBN 978-80-553-2495-1 5. Murthya J.K.N. Effect of grinding on the erosion behaviour of a WC–Co–Cr coating deposited by HVOF and detonation gun spray processes, Wear 2001, 294, 592–600. 6. Sahraouia T. et al. HVOF sprayed WC–Co coatings: Microstructure, mechanical properties and friction moment prediction, Materials & Design 2010 , 31, 1431–1437. 7. Żórawski W. The microstructure and tribological properties of liquid-fuel HVOF sprayed nanostructured WC–12Co

Abstract

The paper presents results of research of the essential characteristics of two kinds of advanced coatings applied by HVOF technology. One studied coating: WB-WC-Co (60-30-10%) contains two types of hard particles (WC and WB), the second coating is eco-friendly alternative to the previously used WC-based coatings, called “green carbides” with the composition WC-FeCrAl (85-15%). In green carbides coating the heavy metals (Co, Ni, NiCr) forming the binding matrix in conventional wear-resistant coatings are replaced by more environmentally friendly matrix based on FeCrAl alloy. On the coatings was carried out: metallographic analysis, measurement of thickness, micro-hardness, adhesion, resistance to thermal cyclic loading and adhesive wear resistance (pin-on-disk test). One thermal cycle consisted of heating the coatings to 600°C, dwell for 10 minutes, and subsequently cooling on the still air. The number of thermal cycles: 10. The base material was stainless steel AISI 316L, pretreatment prior to application of the coating: blasting with white corundum, application device JP-5000.

Characterization, Journal of Thermal Spray Technology 2001 , 10, 311-325. 8. Brezinová J. et al. Microstructure, Wear Behavior and Corrosion Resistance of WC–FeCrAl and WC–WB–Co Coatings, Metals 2018 , 8, 399. 9. Brezinová J. et al. Quality Evaluation of HVOF Coatings on the Basis of WC–Co in Tribocorrosive Conditions, Materials Science Forum 2015 , 811, 63–66. 10. Thakur L. et al. An investigation on erosion behavior of HVOF sprayed WC–CoCr coatings, Applied Surface Science 2011 , 258, 1225–1234. 11. Cui S.Y. et al. Slurry Erosion Behavior of F6NM Stainless Steel and High