Research ArticleOpen AccessGoogle Scholar indexed

Electrospark Coatings Based on WC-Co Alloys with Aluminium Oxide and Carbon Additives

¹ Institute of Materials, Khabarovsk Scientific Centre, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia.
² Institute of Materials, Khabarovsk Scientific Centre, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia.
³ Institute of Materials, Khabarovsk Scientific Centre, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia.
⁴ Institute of Materials, Khabarovsk Scientific Centre, Far East Branch, Russian Academy of Sciences, Khabarovsk, Russia.

Materials Sciences and Applications·Volume 04 (2013)·Pages 186–190·Published 29 March 2013·DOI10.4236/msa.2013.43022

Abstract

The structure and properties of coatings based on WC-Co alloys containing additives of 1 % - 5% aluminium oxide and 2.5 % - 4.5% carbon were investigated. The coatings had a nanocrystalline structure. Depending on the duration and frequency of the discharge pulses, the ratio between WC and W 2 C in the coatings was different. The additives in the hard alloy allowed us increase the microhardness and wear resistance of the coatings by a factor of 2 - 3 in comparison to coatings created using a conventional WC-10%Co alloy.

KeywordsElectrospark DepositionCoatingsTungsten CarbideCarbonAluminium OxideWearMicrohardness

N. I. Lazarenko, “Electrospark Coating of Metal Surfaces,” M. Mashinostroenie, Russia, 1976, p. 44. (in Russian)
R. N Johnson and G. L. Sheldon, “Advances in the Electrospark Deposition Coating Process,” Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 4, No. 6, 1986, pp. 2740-2746. doi:10.1116/1.573672
E. A. Brown, G. L. Sheldon and A. E. Bayoumi, “A Parametric Study of Improving Tool Life by Electrospark Deposition,” Wear, Vol. 138, No. 6, 1990, pp. 137-156. doi:10.1016/0043-1648(90)90173-8
A. V. Ribalko and O. Sahin, “A Modern Representation of the Behaviour of Electrospark Alloying of Steel by Hard Alloy,” Surface and Coatings Technology, Vol. 201, No. 3-4, 2006, pp. 1724-1730. doi:10.1016/j.surfcoat.2006.02.044
E. A. Levashov, E. I. Zamulaeva, A. E. Kudryashov, P. V. Vakaev, M. I. Petrzhik and A. Sanz, “Materials Science and Technological Aspects of Electrospark Deposition of Nanostructured WC-Co Coatings onto Titanium Substrates,” Plasma Processes and Polymers, Vol. 4, No. 3, 2007, pp. 293-300. doi:10.1002/ppap.200600148
N. Radek and K. Bartkowiak, “Performance Properties of Electro-Spark Deposited Carbide-Ceramic Coatings Modified by Laser Beam,” Physics Procedia, Vol. 5, 2010, pp. 417-423. doi:10.1016/j.phpro.2010.08.163
E. I. Zamulaeva, E. A. Levashov, A. E. Kudryashov, P. V. Vakaev and M. I. Petrzhik, “Electrospark Coatings Deposited onto an Armco Iron Substrate with Nano- and Microstructured WC-Co Electrodes: Deposition Process, Structure, and Properties,” Surface and Coatings Technology, Vol. 202, No. 15, 2008, pp. 3715-3722. doi:10.1016/j.surfcoat.2008.01.008
R. J. Wang, Y. Y. Qian and J. Liu, “Interface Behavior Study of WC92-Co8 Coating Produced by Electrospark Deposition,” Applied Surface Science, Vol. 240, No. 1-4, 2005, pp. 42-47. doi:10.1016/j.apsusc.2004.05.299
S. V. Nikolenko, A. D. Verkhoturov and M. I. Dvornik, “Use of Nanopowder Al2O3 as the Inhibitor of the Grain Growth in WC-8%Co Alloy,” Voprosju Materialovedenia, No. 2, 2008, p. 100. (in Russian)
P. Bague, J. P. Morizot and G. Desgardin, “Evidence for the Phenomenon of Carburization-Decarburization of Tungsten Carbide,” Journal of Physics D: Applied Physics, Vol. 27, No. 2, 1994, pp. 402-406. doi:10.1088/0022-3727/27/2/034
J. M. Guilemany, S. Dosta and J. R. Miguel, “The Enhancement of the Properties of WC-Co HVOF Coatings through the Use of Nanostructured and Microstructured Feedstock Powders,” Surface and Coatings Technology, Vol. 201, No. 3-4, 2006, pp. 1180-1190. doi:10.1016/j.surfcoat.2006.01.041

Menu

Menu

Menu

Electrospark Coatings Based on WC-Co Alloys with Aluminium Oxide and Carbon Additives

Abstract

References (11)