Cubic γ-Al2O3 coating modified graphite powder. (November 2020)

• Record Type: Journal Article
• Authors: Zhang, Yongfu; Bu, Aiming; Xiang, Yan; Yang, Yunjie; Chen, Weiwei; Cheng, Huanwu; Wang, Lu
• Is Part Of: Vacuum. Volume 181(2020)
• Publication Date: 2020-11
• Subjects: Graphite powder -- Cubic Al2O3 coating -- Non-electrode plasma electrolysis technology -- Wettability -- Oxidation resistance; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109739
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Poor wettability and oxidation resistance have limited the application of graphite powder. A key to the problem is the surface modification. A ceramic coating was synthesized in this manuscript by the non-electrode plasma electrolysis technique for the purpose. The result showed that a cubic γ-Al2 O3 coating was deposited on the graphite with a thickness of ~50 nm. The γ-Al2 O3 coating significantly improved the oxidation resistance of the graphite powder and wettability, evidenced by ~80 °C the obvious increase of the initial oxidation temperature and ~50% improvement in wettability. We believe the technology will promote the development of powder surface modification technology and the application of the graphite powder. Highlights: A novel plasma electrolysis was applied to graphite powders. Cubic γ-Al2O3 coating was deposited on the graphite powders. Wettability of the powders was improved by ~50%. The initial oxidation temperatures were increased by ~80 °C. Both the electrochemical process and the plasma effect influence the coating.