Akademik Veri Yönetim Sistemi
Journal of Thermal Spray Technology, 2025 (SCI-Expanded, Scopus)
In this study, a CNT-reinforced nanocomposite powder containing 2 wt.% carbon nanotubes was synthesized via spray drying and deposited onto an AA7075 aluminum alloy substrate using the low-pressure cold spray (LPCS) technique. The nanocomposite powder was produced by ultrasonically dispersing CNTs onto lead particles in an aqueous solution, followed by spray drying at low temperatures to avoid damaging the CNTs. The resulting powders were spherical and exhibited homogeneous CNT distribution. Coatings obtained through LPCS demonstrated a dense microstructure with a low porosity level of 2.77%, despite the relatively high CNT content. SEM/EDS analyses confirmed CNT preservation, while EDS mapping revealed a uniform carbon distribution within the matrix, indicating effective CNT embedding and reducing the likelihood of localized agglomeration. Elemental analysis verified CNT incorporation, showing 7.30 wt.% carbon and negligible sulfur, which—together with microstructural observations—confirmed CNT retention and their reinforcing effect. Nanoindentation and microhardness tests revealed that the incorporation of 2 wt.% MWCNTs into the lead–alumina matrix increased hardness significantly (from 13.1 to 20.5 HV), while the elastic modulus showed only a small increase (35 to 36 GPa). The CNT-reinforced coating also exhibited more elastic and limited deformation, indicating improved resistance to plastic deformation without a notable change in stiffness. The results indicate that the assumed approach effectively addresses common challenges in CNT/metal powder production, such as agglomeration and poor bonding, and enables the production of dense composite coatings with enhanced mechanical properties.