Enhancement of mechanical and thermal properties of diamond particles via vanadium carbide coatings

• Published in: Diamond and related materials 2024-10, Vol.148, p.111510, Article 111510
• Main Authors: Wang, Xueqi, Tu, Jianbo, Liu, Baochang
• Format: Article
• Language: English
• Subjects: Mechanical properties; Molten salt method; Oxidation resistance; Vanadium carbide coatings
• ISSN: 0925-9635
• DOI: 10.1016/j.diamond.2024.111510

Vanadium carbide coated diamonds were successfully fabricated by molten salt method. The effect of temperature (from 700 °C to 1000 °C) and molar ratio (carbon:vanadium, from 7:1 to 1:1) on the mechanical and thermal performance of vanadium carbide coatings and coated diamond particles were systematically investigated by SEM, EDS, XRD and XPS. The results showed that, compared with uncoated diamonds, the static compressive strength and oxidation resistance of the coated diamonds increased by 42.27 % and 158.82 °C, respectively. The vanadium carbide coatings were mainly composed of V2C and VC. As the temperature rose, the thickness of the coatings increased and cracks and holes appeared on the surface of the coating under thermal stress. With the increasing of the relative content of vanadium in raw materials, the crystal structure of vanadium carbide coatings changed from microcrystalline structure to reticular structure and the microcrystalline structure vanadium carbide coatings showed better performance. [Display omitted] •Successfully prepared vanadium carbide coated diamonds by molten salt method.•Systematically studied the effect of multiple preparation parameters on the properties of coated diamonds.•The strength and oxidation resistance of vanadium carbide coated diamonds increased by 42.7 % and 158.82 °C.