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Research Status of Cermet Coatings

Author: langfeng Time: 2017-08-16

Research Status of Cermet Coatings

Metal and ceramic materials have their own unique excellent performance and obvious performance weaknesses, how to metal and ceramic materials, the advantages of their respective advantages, has been the material science and engineering research direction. Metal ceramic composite coating technology, that is, the plastic matrix evenly distributed with the shape of particles, the size of the appropriate ceramic phase, the successful realization of the advantages of metal and ceramic combination, the preparation of both the strength and toughness of metal, but also ceramic high temperature , Wear-resistant, corrosion-resistant and other advantages of composite materials, greatly broadening the metal materials and ceramic materials, their respective applications in the aviation, aerospace, chemical, mechanical, power and other industrial applications have been successful [20] [21]. In the industry, the most widely used metal-ceramic coating are: Cr3C2-NiCr, WC-Co. Most use HVOF, plasma and explosive spraying process.
Cr3C2-NiCr cermet coating consists of refractory chromium carbide hard phase and good toughness of the nickel-chromium alloy phase composition, with high temperature hardness, excellent high temperature wear resistance, corrosion resistance, oxidation resistance and higher (530 ~ 9000 ℃) abrasive wear, corrosion wear and erosion wear parts of the work, such as the continuous annealing of the furnace roll, rolling mill continuous production line core roller, cylinder piston ring , Cylinder lining and so on. TiB2-based cermet coating has a high melting point, high hardness, good electrical and magnetic properties and high corrosion resistance, is a potential alternative to Cr3C2 for high temperature, wear-resistant cermet. Than A12O3, Cr3C2-NiCr, WC-Co has a higher wear resistance [22].
WC-based cermet coating commonly used in 450 ℃ below the abrasive wear and erosion wear conditions. Xu Xiangyang et al [23] studied the micro-wear mechanism of plasma sprayed WC / 18Co coating. The results show that the wear of the coating is mainly due to adhesive wear, the coating hardness is high, the anti-adhesion ability is strong and the wear is slight. The stable stage is mainly composed of fatigue delamination and brittle cracking, Low bonding strength, easy to wear. The oxide inclusions in the coating layer are the main reasons for the insufficient wear resistance of the coating.
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