Influence of Preliminary Heat Treatment and Ball Milling of Aluminum Powder on Cold Spray Process

Abstract:

This paper presents the results of a study of the effect of preliminary heat treatment and ball milling of aluminum powder on the cold spraying process and the properties of the obtained coatings (porosity and microhardness). The ball milling of aluminum powder leads to an increase in specific surface area, a decrease in apparent density and a decrease in the value of the crystallite size, which indicates a decrease in grain size. It is shown that coatings deposited from ball milled powders have slightly higher coatings hardness averagely. The profilometry of aluminum coatings obtained under the same conditions from the initial and processed powders did not reveal significant changes in the form of coatings and their typical dimensions (width, thickness), which indicates the absence of significant changes in the deposition coefficient of the initial and processed aluminum powders. Ball milled powders on average correspond to slightly higher hardnesses of coatings.

• Periodical: Solid State Phenomena (Volume 313)
• Pages: 127-135
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.313.127
• Online since: January 2021
• Authors: S.V. Klinkov, V.F. Kosarev, A.E. Chesnokov*, A.V. Smirnov, V.S. Shikalov
• Keywords: Aluminum Powder, Coherent Scattering Region, Cold Spraying, High-Energy Planetary Mill, Microhardness, XRD-Analysis

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