Abstract
In this work an influence of cold spray nozzle displacement parameters on the properties of copper-silicon carbide cold spray deposits is considered. In particular the influence of nozzle traverse speed and distance between deposited tracks on the coating porosity and behavior during compressive tests was analyzed. It was shown that cold spraying at low nozzle traverse speed leads to formation of thick tracks with quasi-triangular cross-section. As a consequence, the particle impact angle on the sides of spraying track increases that. Thus, the particle deformation at impact on the track periphery becomes insufficient and local porosity value rises. Increase of nozzle traverse speed allows increasing coating density and mechanical properties due to amelioration of particle deformation conditions. Compressive tests revealed significant anisotropy of mechanical properties of copper-silicon carbide cold spray deposits. In particular, compressive strength measured in vertical direction (perpendicular to the substrate) was significantly higher than one measured in horizontal plane (parallel to substrate). This anisotropy could be explained by the orientation of particle deformation pattern during impact.
Highlights
The cold spray (CS) technology is a technique of a solid-state coating deposition using high velocity and preheated gas flow for acceleration of micron-sized particles of powder through converging-diverging supersonic nozzle
This process is operated at relatively low temperatures and high impact velocities, that leads to the powder bonding and formation of deposits on the substrate due to sever plastic deformation of the powder [1,2,3,4,5]
Previous studies showed that addition of ceramic powder to the metal ones increases the coating adhesion and density; ameliorate its mechanical properties and corrosion resistance, mechanical properties and the corrosion resistance in comparison of the cold spray deposits of the same but pure metal without ceramic inclusions [10,11,12,13,14,15,16,17]
Summary
The cold spray (CS) technology is a technique of a solid-state coating deposition using high velocity and preheated gas flow (typically nitrogen or helium) for acceleration of micron-sized particles of powder through converging-diverging supersonic nozzle. This process is operated at relatively low temperatures and high impact velocities, that leads to the powder bonding and formation of deposits on the substrate due to sever plastic deformation of the powder [1,2,3,4,5]. The work was performed in the frame of “COCONUT” research project supported by ANDRA agency [18]
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