Abstract
Diamond-like carbon (DLC) films have a high hardness and a low friction coefficient. Therefore, DLC films are applied in industrial fields to reduce energy consumption. However, DLC films can only be obtained as coatings, and DLC films of only micrometer thickness can be deposited on substrates. In this study, we focused on the cold spray (CS) technique as a means of obtaining a DLC-containing metal composite. DLC-containing metal composite films with a millimeter thickness and a low friction coefficient were obtained by depositing DLC-coated metal [copper (Cu) and titanium (Ti)] particles by the CS technique. For Cu particles, DLC-coated particles were prepared with two different deposition times. Then, composite films were fabricated by the CS technique using these particles. The thickness of the DLC-containing Cu(Cu-DLC) composite film was 200 μm and that of the DLC-containing Ti (Ti-DLC30) composite film was 252 μm, and the introduction of DLC into the metal films was demonstrated by Raman spectroscopy. Then, we conducted a sliding test using a ball to evaluate the sliding characteristic of each film. The Cu-DLC composite films deposited from thin DLC-coated Cu particles behaved as a solid lubricant in the ball-on-disk test and Cu-DLC composite films deposited from thick DLC-coated Cu particles acted as an abrasive. For Ti particles, DLC was graphitized and acted as an abrasive.
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Acknowledgments
Part of this work was financially supported by Ohata foundation. Part of work was supported by JSPS KAKENHI Grant No. 17KK0111. We would like to acknowledge the support of CS process by Startack Co., Ltd.
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Okimura, N., Choi, J., Nakayama, W. et al. Metal Matrix Composites Using Diamond-like Carbon-Coated Particles Fabricated by Cold Spray Technique. J Therm Spray Tech 29, 1660–1668 (2020). https://doi.org/10.1007/s11666-020-01071-0
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DOI: https://doi.org/10.1007/s11666-020-01071-0