Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Microstructural characterization of Fe-Cu-Al-Al2O3 coatings prepared with cold gas spraying technique

nr katalogowy: 79718

Supersonic Cold Gas Spraying (SCGS) is a high-rate material deposition process in which small, unmelted powder particles (typically 1 to 50 m in diameter) are accelerated to velocities between 600 to 1000 m/s in a supersonic jet of compressed gas. In this technique, particles are accelerated to very high speeds by means of a carrier gas forced through a converging-diverging de Laval nozzle [1]. The method was originally developed in the Institute of Theoretical and Applied Mechanics of the Russian Academy of Science in Novosibirsk [2]. Upon impact with a surface, the solid particles deform and bond together, rapidly building up a layer of deposited material [3]. A typical feature of cold spraying is that a deposit can be formed without changing of the original structure and phase composition of sprayed materials. Only particles which reach the velocity higher than the critical velocity can be deposited on a substrate in cold spraying [4]. Figure 1 shows a system in which the main gas stream and the powder stream are both introduced into the mixing chamber of the converging-diverging nozzle. [5]. SCGS coatings in mechanical applications are applied to extend the working time of components, through reduction of abrasive corrosion and wear, and therefore an increase in the efficiency of working elements. The researched coatings will be applied on elements exposed to high wear. The effect of changing the deposition parameters of FeCu23Al10 with 17 wt % Al2O3 (FACAl) coatings was studied through the examination of the microstructure, chemical and phase composition. EXPERIMENTAL Investigated materials The experimental material consisted of carbon steel samples measuring 50×15×4 mm, on which the coatings were deposited using the SCGS method. The following process parameters were used during the deposition: a gas temperature between 600÷800°C, variable pressure 3.2÷4.0 MPa, and stand-off distance 20÷40 mm. The process of co[...]

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