Sustainable super-hard and thick nanodiamond composite film deposited on cemented carbide substrates with an interfacial Al-interlayer

•Super-hard NDC films showcase 58 GPa hardness at 10 µm thickness.•Al interlayer boosts adhesion, suppressing Co catalytic effects for improved properties.•Nanostructured NDC film exhibits dense structure with consistent surface roughness.•Raman validates nanodiamond and amorphous carbon phases in N...

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Bibliographic Details
Published in:Materials letters 2024-06, Vol.364, p.136369, Article 136369
Main Authors: Egiza, Mohamed, Ragab Diab, Mohamed, Ali, Ali M., Murasawa, Koki, Yoshitake, Tsuyoshi
Format: Article
Language:English
Subjects:
Al-interlayer
Arc plasma
Catalytic effects
Mechanical properties
Nanocomposites
Surface interface
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Summary:•Super-hard NDC films showcase 58 GPa hardness at 10 µm thickness.•Al interlayer boosts adhesion, suppressing Co catalytic effects for improved properties.•Nanostructured NDC film exhibits dense structure with consistent surface roughness.•Raman validates nanodiamond and amorphous carbon phases in NDC films.•XPS quantifies a significant 70% C sp3 fraction within NDC films. Super-hard nanodiamond composite (NDC) films, synthesized via cathodic arc plasma deposition on unheated WC − Co substrates, offer an eco-friendly solution for cutting tools. A 100 nm-thick Al-interlayer mitigates Co catalytic effects, improving adhesion and yielding smooth and dense 10 µm-thick films at a deposition rate of 3.3 μm/hr. These grain-boundary-rich nanostructured films, with an impressive 58 GPa hardness attributed to a substantial 70 % C sp3 fraction, prove optimal for hard coatings. The Al-interlayer effectively suppresses Co catalytic effects, forming a dense Al-oxide layer, enhancing film hardness and adhesion (Lcr = 18.6 N). NDC films present a promising eco-friendly option for high-performance hard coatings.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.136369