Strengthening and Toughening CNTs/Mg Composites by OpTimizing the Grinding Time of Magnesium Powder

Abstract

In this paper, CNT/Mg composites with high compressive properties were prepared by using Ni-plated CNT and pure magnesium powder as raw materials through the grinding of magnesium powder, ball-milling mixing and hot-pressing sintering. The effect of grinding time for finer magnesium powder on the microstructure and properties of the final composites was studied mainly by SEM, XRD, HRTEM and compression tests. The results show that with the prolongation of milling time, the magnesium particle size decreases gradually and the CNT dispersion becomes more uniform. Moreover, the nickel layer on the surface of CNT reacts with highly active broken magnesium powder in the sintering process to generate MgNi2 intermediate alloy, which significantly improves interface bonding. The strength and fracture strain of composites are significantly increased by the combined action of the uniform distribution of CNTs and strong interface bonding from the MgNi2 phase. The compressive strength, yield strength and fracture strain of the composites, prepared with a 60 h grinding of magnesium powder, reached 268%, 272% and 279% of those in composites without the grinding of magnesium powder.

Understanding the anti-corrosion characteristics of surface modification of h-BN and carbon nanotubes/magnesium composites in simulated seawater

“…The reason for this was that the thickness of the molten metal prevented the CNTs and h-BN's in the Mg matrix from becoming improperly wettable. In the work of, 31,32 the stir casting method yielded similar results.…”

Fabrication of NiFe-LDHs Modified Carbon Nanotubes as the High-Performance Sulfur Host for Lithium–Sulfur Batteries

“…The TEM image (Figure 2d) clearly shows that NiFe-LDH nanosheets grow at the cross-linking points of CNTs, forming a 3D network structure for sulfur loading. HRTEM image of NiFe-CNT (Figure 2e) reveal lattice fringes with a spacing of 0.341 nm, corresponding to the layers of multiwalled CNTs [16]. Lattice fringes with a spacing of 0.203 nm, which correspond to the (018) The morphology and structure of NiFe-LDHs and NiFe-CNT were observed using scanning electron microscopy (SEM).…”