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4552 |
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Thursday, May 12, 2016, Room 3G 11:20 AM Equipment / Consumables & Powders, Wires, Suspensions |
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Structural and phase state of the material between the ceramic layer and the metallic substrate formed by high-speed jet of powder |
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Jeff Jia / Beijing United Coatings Technologies Co., China M. Prozorova / Belgorod State National Research University, Joint Research Center, Russia Yu Tyurin/ E.O. Paton Electric Welding Institute, NASU, Ukraine M. Kovaleva/ Belgorod State National Research University, Joint Research Center, Russia Jeff Jia/ Beijing United Coatings Technologies Co., China N. Vasilik/ N.N. Semenov Institute of Chemical Physics, RAS, Russia O. Kolisnichenko/ E.O. Paton Electric Welding Institute, NASU, Ukraine M. Arseenko*/ Belgorod State National Research University, Joint Research Center, Russia I. Pavlenko/ Belgorod State National Research University, Center for Constructional Ceramics and the Engineering Prototyping, Russia |
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In the present study a new multi-chamber detonation sprayer (MCDS) was employed to deposit Al2O3 ceramic coatings on substrate of alloys based on iron and titanium. MCDS provides a working gas rate up to 3000 m/s with low thermal power excepting overheating of the powder material and substrate. The ceramic powders were fed into the cylindrical chamber barrel. Each of discrete particles had the same conditions for the acceleration and heating in the high-speed jet of product of detonation combustion. The studies have shown that ceramic micropowders accelerated up to 2000 m/s. Generally, only the surface layer of ceramic particles has time to warm up at this speed. When a particle strikes a solid material of substrate a surface layer receives additional energy and cooperates with the metal elements forming the intermetallic compounds. Electron microscopic studies of the layer between the coating and substrate have shown the presence of the intermetallic compound type of FeAl, TiAl formed during plastic deformation and thermal diffusion of the coating and the substrate. The intermetallic materials of this layer were formed in a nanocrystalline state. This increases their plasticity and conducive the relaxation stresses generated in the formation of the ceramic layer. |