Unveiling a 72.5 GPa peak hardness in sustainable nanodiamond composite hard coatings via discharge energy control: A nanoindentation-Raman approach

• DOI: 10.1016/j.matlet.2024.136684
• Publication Date: 2024-05-26T21:40:07Z
• Authors: Mohamed Egiza; Mohamed Ragab Diab; Hoda Atta; Mahmoud M. Abdelf...; Abdelhamid El-Shaer; Tsuyoshi Yoshitake
• Keywords: Nanodiamond

Sustainable nanodiamond composite (NDC) films hold promise for high-performance hard coatings thanks to coaxial arc plasma deposition (CAPD). This eco-friendly technique eliminates the need external heating, chemical reactions, or Co substrate pre-treatment. CAPD boasts lower energy consumption and faster rates, making it a sustainable solution growing demand high-quality, environmentally friendly coatings. study investigates influence of discharge on nanostructure mechanical properties these NDC films. Optimal energy, ranging from 2.3 12 J/pulse, was meticulously explored. A combined nanoindentation-Raman approach reveals significant correlation between film properties. Remarkably, at 7 peak hardness 72.5 GPa is achieved, surpassing other levels. Raman spectroscopy confirms maximum content this level (evidenced by maximized Adia/AG ratio, indicating higher diamond-to-graphite ratio), along with minimal graphitization. Additionally, presence trans-polyacetylene (t-PA) peaks (denoted as At-PA) revealed existence grain boundaries ratio (At-PA/AG), contributing enhanced Optimizing tailors nanostructure, enhancing performance advanced