Yehia Hossam M, Elmetwally Reham A H, Elhabak Abdelhalim M, El-Kady Omayma A, Shash Ahmed Yehia
Mechanical Department, Faculty of Technology and Education, Helwan University, Cairo 11795, Egypt.
Faculty of Engineering, Cairo University, Cairo 12613, Egypt.
Materials (Basel). 2023 Nov 15;16(22):7174. doi: 10.3390/ma16227174.
In this study, the nano-aluminum powder was reinforced with a hybrid of copper and graphene nanoplatelets (GNPs). The ratios of GNPs were 0 wt%, 0.4 wt%, 0.6 wt%, 1.2 wt% and 1.8 wt%. To avoid the reaction between aluminum and graphene and, consequently, the formation of aluminum carbide, the GNP was first metalized with 5 wt% Ag and then coated with the predetermined 15 wt% Cu by the electroless coating process. In addition, the coating process was performed to improve the poor wettability between metal and ceramic. The Al/(GNPs-Ag)Cu nanocomposites with a high relative density of 99.9% were successfully prepared by the powder hot-pressing techniques. The effects of (GNPs/Ag) and Cu on the microstructure, density, hardness, and compressive strength of the Al-Cu nanocomposite were studied. As a result of agitating the GNPs during the cleaning and silver and Cu-plating, a homogeneous distribution was achieved. Some layers formed nano-tubes. The AlC phase was not detected due to coating GNPs with Cu. The CuAl intermetallic was formed during the sintering process. The homogeneous dispersion of Cu and different ratios of GNs, good adhesion, and the formation of the new CuAl intermetallic improved in hardness. The pure aluminum sample recorded 216.2 HV, whereas Al/Cu reinforced with 1.8 GNs recorded 328.42 HV with a 51.9% increment. The compressive stress of graphene samples was improved upon increasing the GNPs contents. The Al-Cu/1.8 GNs sample recorded 266.99 MPa.
在本研究中，纳米铝粉用铜和石墨烯纳米片（GNPs）的混合物进行增强。GNPs的比例分别为0 wt%、0.4 wt%、0.6 wt%、1.2 wt%和1.8 wt%。为避免铝与石墨烯之间发生反应从而形成碳化铝，首先用5 wt%的银对GNP进行金属化处理，然后通过化学镀工艺涂覆预定的15 wt%的铜。此外，进行涂覆工艺是为了改善金属与陶瓷之间较差的润湿性。通过粉末热压技术成功制备了相对密度高达99.9%的Al/(GNPs-Ag)Cu纳米复合材料。研究了(GNPs/Ag)和铜对Al-Cu纳米复合材料的微观结构、密度、硬度和抗压强度的影响。由于在清洗以及镀银和镀铜过程中对GNPs进行了搅拌，实现了均匀分布。一些层形成了纳米管。由于用铜包覆了GNPs，未检测到AlC相。在烧结过程中形成了CuAl金属间化合物。铜和不同比例的GNs的均匀分散、良好的附着力以及新形成的CuAl金属间化合物提高了硬度。纯铝样品的硬度为216.2 HV，而用1.8 GNPs增强的Al/Cu的硬度为328.42 HV，增幅为51.9%。随着GNPs含量的增加，石墨烯样品的压应力得到改善。Al-Cu/1.8 GNs样品的压应力为266.99 MPa。
