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2017 year, number 5

Creation of Heterogeneous Materials on the Basis of B4C and Ni Powders by the Method of Cold Gas-Dynamic Spraying with a Subsequent Layer-by-Layer Laser Action

V. M. Fomin, A. A. Golyshev, V. F. Kosarev, A. G. Malikov, A. M. Orishich, N. S. Ryashin, A. A. Filippov, V. S. Shikalov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: карбид бора, никель, покрытие, холодное газодинамическое напыление, лазерное воздействие, микроструктура, шероховатость, морфология, boron carbide, nickel, coating, cold gas-dynamic spraying, laser action, microstructure, roughness, morphology

Abstract

A method is proposed for creating principally new functionally graded heterogeneous materials on the basis of B4C ceramic powders with different mass fractions in the initial mixture and plastic metallic additive of Ni by a combined method of cold gas-dynamic spraying with a subsequent layer-by-layer laser action. Mechanical properties of the resultant tracks are examined. It is shown that the track microhardness increases with increasing B4C concentration in the initial mixture. The track structure is found to depend on the size of ceramic particles in the interval from 3 to 75 μm. Reduction of the B4C particle size (approximately by a factor of 2-3) inside the track owing to fragmentation under the action of the laser beam is observed for the first time.