Effect of Gas-Dynamic Spraying Temperature on Diffusion and Transformations of Phase Composition and Microstructure During Formation of Coatings Based on Copper and Zinc
V. E. Arkhipov, L. I. Kuksenova, G. V. Moskvitin, M. S. Pugachev
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Abstract
The process of formation, the structure, and the phase composition of coatings based on copper and zinc and deposited by cold gas-dynamic spraying are studied. It is shown that a multiphase structure is formed in the coating based on a solid solution of copper in zinc, a solid solution of zinc in copper and solid solutions based on electron compounds CuZn3 and Cu5Zn8. At a low spraying temperature (270°C), the formation of the structure is mainly influenced by interboundary diffusion. The total diffusion rate is Dc = 0.15 × 10–12 m2/sec. When the spraying temperature is increased to 360°C and higher values (450°C), the vacancy diffusion mechanism prevails. The diffusion rate increases to Dc = 0.56 × 10–12 m2/sec, which is accompanied by an increase in the mass fraction of the transformation products. A model of formation of the multiphase gradient coating structure is suggested and the influence of the spraying parameters on the formation of the structure is discussed.
期刊介绍：
Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering.
Topics covered include:
New structural, high temperature, tool and precision steels;
Cold-resistant, corrosion-resistant and radiation-resistant steels;
Steels with rapid decline of induced properties;
Alloys with shape memory effect;
Bulk-amorphyzable metal alloys;
Microcrystalline alloys;
Nano materials and foam materials for medical use.
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