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Analysis of the cold gas spraying process and determination of selected properties of metallic coatings on polymers

Abstract : The aim of this Phd thesis was to analyze the possibility of metallization of polymers surface using a Low-Pressure Cold Gas spraying method. Two polymers substrate: polyamide 6 (Pa 6) and polycarbonate (PC) were investigated. The coatings were deposited using: tin, aluminium and copper powders. Within the framework of this work powders particles velocity and temperature was calculated during spraying process. The obtained particle velocity was compared to the critical velocity to select initial spraying conditions. Direct spraying on polymers substrate brought acceptable properties only for tin powder. Aluminium coatings delaminated spontaneously after spraying process. In case of copper powder deposition of continuous layer was impossible. Next, the influence of powder morphology, heat treatment of the feedstock material and the use of interlayers on the deposition process was investigated. Consequently, aluminium and copper coatings were obtained on both polymers. For a set of received coatings (Sn, Al, Cu) microstructure was observed and the results of adhesion, resistivity, micro-hardness, Young's modulus, and oxygen content in powders and coatings measurements were given. The bonding mechanism of the powder particles with substrate material was investigated using simulation of impact of copper and tin particle on polyamide substrate in Abaqus program. The simulation results were compared to experimental results. The dissertation was summed up with conclusion and possibilities of further research.
Keywords : Cold spray
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Submitted on : Friday, March 23, 2018 - 1:01:14 AM
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  • HAL Id : tel-01741350, version 1



Aleksandra Malachowska. Analysis of the cold gas spraying process and determination of selected properties of metallic coatings on polymers. Materials. Université de Limoges; Uniwersytet Wrocławski, 2016. English. ⟨NNT : 2016LIMO0012⟩. ⟨tel-01741350⟩



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