Barakat Waheed S, Samir Ahmed, Elkady Omayma A, Abu-Okail Mohamed, Mohamed Abdelkarim Y A, El-Nikhaily A, Abu-Oqail A M I
Mechanical Department, Faculty of Technology and Education, Suez University, Suez, 43221, Egypt.
Powder Technology Department, Manufacturing Technology Institute, Central Metallurgical R & D Institute, Helwan, 11421, Cairo, Egypt.
Sci Rep. 2025 Jan 8;15(1):1251. doi: 10.1038/s41598-024-84249-8.
Ball bearings face numerous challenges under harsh operating conditions of elevated pressure between the balls and other contacting parts of the bearing like drop in tribological properties. To address these challenges, this paper presents the first successful experimental investigation of incorporating an innovative hexagonal boron nitride (h-BN) into Aluminum-Carbon nanotube (Al-0.6 wt% CNTs) nanocomposites. This was achieved using electroless chemical deposition technique to coat the materials with silver (Ag) and nickel (Ni), improving the wettability and dispersion between the matrix and reinforcement. Various h-BN ratios (2, 4, 6, 8 and 10 wt%) are incorporated and consolidated through high-energy ball milling and hot compaction techniques. The produced samples were tested and analyzed physically, mechanically, tribologically, and microstructurally. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were used to explore the new morphologies and structures. The study delves into density, hardness, and wear resistance. The optimal h-BN content is determined to be 8 wt%, enhancing wettability and dispersion within the Al-CNTs matrix. Thus, the properties of hardness, compressive strength, wear rate, and COF at 8 wt% of h-BN content were enhanced by 105%, 60%, 74.5%, and 78.5%, respectively, compared to pure Al. This is due to the uniform scattering of h-BN nanoparticles across the entire surface, despite a significant decrease in relative density. In conclusion, the combination of mechanical alloying, electroless deposition, and hot compaction techniques proves to be effective in producing Al-CNTs/h-BN nanocomposites coated with Ag and Ni nanoparticles.
在球与轴承其他接触部件之间存在高压的恶劣运行条件下，滚珠轴承面临着诸多挑战，比如摩擦学性能下降。为应对这些挑战，本文首次成功开展了一项实验研究，将创新的六方氮化硼（h-BN）融入铝-碳纳米管（Al-0.6 wt% CNTs）纳米复合材料中。这是通过化学镀技术用银（Ag）和镍（Ni）包覆材料来实现的，从而改善了基体与增强体之间的润湿性和分散性。通过高能球磨和热压技术加入并固结了各种不同比例（2、4、6、8和10 wt%）的h-BN。对制备出的样品进行了物理、机械、摩擦学和微观结构方面的测试与分析。利用X射线衍射（XRD）和扫描电子显微镜（SEM）分析来探究新的形态和结构。该研究深入探讨了密度、硬度和耐磨性。确定最佳的h-BN含量为8 wt%，这提高了在Al-CNTs基体内的润湿性和分散性。因此，与纯铝相比，h-BN含量为8 wt%时的硬度、抗压强度、磨损率和摩擦系数分别提高了105%、60%、74.5%和78.5%。这是由于h-BN纳米颗粒在整个表面均匀分散，尽管相对密度显著降低。总之，机械合金化、化学镀和热压技术相结合被证明对于制备包覆有Ag和Ni纳米颗粒的Al-CNTs/h-BN纳米复合材料是有效的。
