Metal matrix composites using surface modified particles fabricated by cold spray technique

Monday, May 27, 2019
Ms. Nana Okimura , Tokyo Institute of Technology, Tokyo, Japan
Mr. Wataru Nakayama , Tokyo Institute of Technology, Tokyo, Japan
Dr. Yuki Hirata , Tokyo Institute of Technology, Tokyo, Japan
Prof. Naoto Ohtake , Tokyo Institute of Technology, Tokyo, Japan
Dr. Hiroki AKASAKA , Tokyo Institute of Technology, Tokyo, Japan
Cold spray (CS) technique can deposit gmmh thick metal films by colliding solid particles to substrate at a supersonic velocity. CS technique is expected to be the process to obtain the metal matrix composite (MMC) from the surface modified metal particles. In this study, we fabricated the MMC by CS technique using surface treated metal particles. To obtain the MMC for tribological application, the Diamond-Like Carbon (DLC) contained metal composite film deposited from the DLC coated metal particles by the CS technique. Friction coefficient of DLC is very low, such as 0.1. To fabricate Cu-DLC composite film, DLC films were deposited on copper particles by pulse plasma chemical vapor deposition process. From the results of Ball on Disk test, friction coefficient of the Cu-DLC composite film was 30% lower than that of Cu film. These results indicated that, characteristic of functional materials can be introduced to the metal matrix film by use of the surface modified particles.
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