Van Hau Tran, Van Trinh Pham, Hoai Nam Nguyen Phuong, Van Tu Nguyen, Lam Vu Dinh, Phuong Doan Dinh, Minh Phan Ngoc, Thang Bui Hung
Institute of Materials Science, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Str., Cau Giay Distr. Hanoi Vietnam
VNU University of Engineering and Technology 144 Xuan Thuy Str., Cau Giay Distr. Hanoi Vietnam.
RSC Adv. 2020 Jun 9;10(37):22080-22090. doi: 10.1039/d0ra03776a. eCollection 2020 Jun 8.
In this study, the effect of graphene nanoplatelet (GNP) size on the microstructure and hardness of the electrodeposited nickel-graphene nanocomposite coatings were investigated. GNPs with different sizes were prepared by using a high energy ball milling technique. The experimental result revealed the high energy ball milling technique could reduce the size, increase the surface area, and improve the dispersion ability of GNPs. The microstructure, hardness, and components of the nanocomposite coatings were greatly affected by GNP sizes. The highest microhardness was measured to be 273 HV for the nanocomposite coatings containing 5 h-milled GNPs, which is increased up to ∼47% compared to pristine Ni coating. The enhancement in the hardness is attributed to the uniform dispersion of the small GNP sizes inside the Ni matrix and the Ni grain size reduction when using milled GNPs.
在本研究中，研究了石墨烯纳米片（GNP）尺寸对电沉积镍-石墨烯纳米复合涂层微观结构和硬度的影响。采用高能球磨技术制备了不同尺寸的GNPs。实验结果表明，高能球磨技术可以减小GNPs的尺寸，增加其表面积，并提高其分散能力。纳米复合涂层的微观结构、硬度和成分受GNP尺寸的影响很大。对于含有经过5小时球磨的GNPs的纳米复合涂层，测得的最高显微硬度为273 HV，与原始镍涂层相比提高了约47%。硬度的提高归因于小尺寸GNP在镍基体中的均匀分散以及使用球磨后的GNPs时镍晶粒尺寸的减小。
