Nanomechanical and structural characteristics of nanodiamond composite films dependent on target-substrate distance.

Egiza, Mohamed; Diab, Mohamed Ragab; Murasawa, Koki; Naragino, Hiroshi; Yoshitake, Tsuyoshi

Abstract

This study explores the optimization of target-substrate distance (TSD) in coaxial arc plasma deposition technique for depositing nanodiamond composite (NDC) films on unheated WC–Co substrates, with a focus on enhancing properties relevant to cutting tool applications. TSD significantly impacted film growth and adhesion, while hardness and Young's modulus remained stable within the 10–50 mm TSD range. Increased TSD led to reduced deposition rates and film thickness, but improved quality by eliminating macroparticles and reducing surface roughness. Notably, the NDC film deposited at 10 mm TSD exhibited exceptional adhesion resistance, a thickness of 11.45 μm, low compressive internal stress (2.8 GPa), and a surface roughness (Sa) of 280 nm, coupled with an impressive hardness of 49.12 GPa. This film also achieved a favorable deposition rate of 1.05 nm/s. In comparison, the film deposited at 15 mm TSD displayed a maximum hardness of 51.3 GPa, lower Sa of 179 nm, but a reduced deposition rate of 0.29 nm/s. The estimated C sp3 fraction correlated well with the nanoindentation measurements, while internal stress showed a consistent relationship with film adhesion. These findings suggest that a TSD of 10 mm is optimal for balancing hardness, adhesion, deposition rate, and surface roughness, making NDC films a promising candidate for cutting tool applications.

Citation

EGIZA, M., DIAB, M.R., MURASAWA, K., NARAGINO, H. and YOSHITAKE, T. [2024]. Nanomechanical and structural characteristics of nanodiamond composite films dependent on target-substrate distance. Arabian journal for science and engineering [online], Latest Articles. Available from: https://doi.org/10.1007/s13369-024-09161-9

• Journal Article Type: Article
• Acceptance Date: May 6, 2024
• Online Publication Date: Jun 18, 2024
• Deposit Date: Jun 19, 2024
• Publicly Available Date: Jun 19, 2024
• Journal: Arabian journal for science and engineering
• Print ISSN: 2193-567X
• Electronic ISSN: 2191-4281
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1007/s13369-024-09161-9
• Keywords: Nanodiamond composite films; Cutting; Plasma deposition; Hard coatings; DLC; Coaxial arc plasma; Target-substrate distance; Internal stress; XPS
• Public URL: https://rgu-repository.worktribe.com/output/2377575