National Technical University of Ukraine “Kiev Polytechnic Institute”, Kiev, Ukraine:
A. N. Stepanchuk, Professor, e-mail: astepanchuk@iff.kpi.ua
M. B. Shevchuk, Junior Researcher
A. A. Demidenko, Post-Graduate Student

This paper shows the prospect of use of self-fluxing iron-based alloy for creation of multi-purpose composite materials and coatings. For the first time, there were studied the processes of air and protective medium wetting of hard alloys' wastes and some carbides of transition metals of the ІVa–VІa groups of the Periodic Table by iron-based alloy melt at different temperatures and different wetting time. There is shown that the wetting angle for the most studied systems and mediums is less than 10–20 arc degrees at the temperature of above 1200 ^оС and wetting time of more than 10 minutes. In contrast to wettability of refractory compounds by other metals and alloys, presence of such air wettability is explained by the property of iron-based melts of reduction and dissolution of surface oxides. There were defined the regularities of formation of the structure of composite materials in the process of their obtaining from refractory compounds by saturation of pellets by iron-based alloy melt. It is shown that refractory compounds are dissolved in ironbased alloy melt with following formation during crystallization of secondary structures. During the reaction of iron-based alloy melt with carbides, there can be formed the hypoeutectic, eutectic and hypereutectic structures with crystallization of secondary colonies of grains of Mе₆C/Mе₁₂C-type carbides. There were defined the conditions for manufacturing of composite materials and thick coatings, together with process of manufacturing of details by mold casting with absolute density and determined structure.

1. Voynov B. A. Iznosostoykie splavy i pokrytiya (Wear-resistance alloys and coverings). Moscow : Mashinostroenie, 1980. 120 p.
2. Shan-Ping Lua, Oh-Yang Kwona, Yi Guob. Wear behavior of brazed WC/NiCrBSi(Co) composite coatings. Wear. 2003. pp. 421–428.
3. Yang Q., Senda T. Effect of Carbide Grain Size on Microstructure and Sliding Wear Behavior of HVOF-Sprayed WC – 12 % Co Coatings. Wear. 2003. pp. 23–34.
4. Yan-pei Song, Hua Yu, Mao Xie-Min. Wear behavior of WCP/Fe – C composites under high-speed dry Sliding. Journal of Materials Science. 2008. No. 5. pp. 46–54.
5. Bao J., Newkirk J. W., Bao S. Wear-Resistant WC Composite Hard Coatings by Brazing. The Journal of Materials Engineering and Performance. 2004. Vol. 13, No. 4. pp. 385–388.
6. M. Kasparova, Zahalka F., Houdkova S. WC – Co and Cr₃C₂ – NiCr Coatings in Low- and High-Stress Abrasive Conditions. Journal of Thermal Spray Technology. 2010. Vol. 20, No. 3. pp. 412–424.
7. Duboviy O. M., Stepanchuk A. M. Tekhnologіya napilennya pokrittіv : pіdruchnik (Technology of sputtering of coverings : tutorial). Mykolaiv : Admiral Makarov National University of Shipbuilding, 2007. 236 p.
8. Stepanchuk A. N. Prochnostnye i abrazivnye svoystva plavlenykh tugoplavkikh soedineniy i instrumentalnykh materialov na ikh osnove (Strength and abrasive properties of melted refractory compounds and tool materials on their basis). Sovremennye spechennye tverdye splavy : sbornik nauchnykh trudov (Modern sintered hard alloys : collection of scientific proceedings). Under the general editorship of N. V. Novikov. Kiev : V. Bakul Institute for Superhard Materials (National Academy of Sciences of Ukraine), 2008. 344 p.
9. Lisovskiy A. F. Formirovanie struktury kompozitsionnykh materialov pri obrabotke metallicheskimi rasplavami (Formation of structure of composite materials during the processing by metallic melts). Kiev : Naukova dumka, 2008. 198 p.
10. Panov V. S., Chuvilin A. M. Tekhnologiya i svoystva spechennykh tverdykh splavov i izdeliy iz nikh (Technology and properties of sintered hard alloys and their products). Moscow : National University of Science and Technology “MISiS”, 2001. 428 p.