抄録
Cold spraying has been developed as a high-quality metallic coating process. However, the deposition mechanism and optimum spray conditions have not been well understood. This study investigates the effects of powder morphology on deposition behavior and adhesion strength of cold-sprayed coatings. It was observed that irregular shaped powders were deposited easier than spherical shaped powders. It was also easier to fabricate thick coating using the irregular shaped powders. However, the adhesion strength of the coating fabricated using the spherical shaped powder was higher than that of the irregular shaped powders. Higher adhesion strength was caused by larger adherence contact area of deposited particle-to-substrate and particle-to-particle. It is concluded that although the irregular shaped powders can be deposited easier, but its adhesion strength is lower than that of the spherical shaped powder.
