Effect of Composition and Method of Mechanical Preparation of a Composite TiC-Ni Mixture on of Titanium Carbide Content in Coatings Formed by Cold Spraying
A. E. Chesnokov, A. V. Smirnov, V. F. Kosarev, S. V. Klinkov, K. A. Skorokhod
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: high-energy planetary mill, cold spraying, composite coatings, titanium carbide
Abstract
This paper describes how the method of preparing a composite TiC - n Ni mixture (n = 40, 50, 75% is the volume fraction of nickel) affects the carbide content in the coating material obtained by cold spraying. It is shown that, when coatings are obtained from a powder mixture prepared in a V-shaped mixer, the titanium carbide content is lower than in coatings obtained from powders mechanically processed in a high-energy planetary mill. In the case of mixing the powder mixture in a V-shaped mixer, fine titanium carbide particles do not reach the substrate surface during spraying because they are decelerated in a shock-compressed gas layer when a supersonic jet accumulates on an obstacle. Thus, these particles do not participate in the formation of the coating. Spraying a mechanically treated powder consisting of composite agglomerated TiC-Ni particles allows for a significant (approximately 1.8-fold) increase in the carbide content in the coating
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