Fabrication and Microhardness Analysis of MWCNT/MnO₂Nanocomposite

Abstract

Recent research has shown that carbon nanotube (CNT) acts as a model reinforcement material for fabricating nanocomposites. The addition of CNT as a reinforcing material into the matrix improves the mechanical, thermal, tribological, and electrical properties. In this research paper multiwalled carbon nanotube (MWCNT), with different weight percentage (5%, 10%, and 15%), was reinforced into manganese dioxide (MnO 2 ) matrix using solution method. The different weight % of MWCNT/MnO 2 nanocomposite powders was compacted and then sintered. The phase analysis, morphology, and chemical composition of the nanocomposites were examined by X-ray diffractometer, Field Emission Scanning Electron Microscope (FESEM), and Energy Dispersive X-Ray (EDX), respectively. The XRD analysis indicates the formation of MWCNT/MnO 2 nanocomposites. The FESEM surface morphology analysis shows that MnO 2 nanotube is densely grown on the surface of MWCNT. Further, microhardness of MWCNT/MnO 2 nanocomposite was measured and it was found that 10 wt% has higher microhardness in comparison to 5 and 15 wt%. The microhardness of the composites is influenced by mass density, nanotube weight fraction, arrangement of tubes, and dispersion of MWCNT in H 2 SO 4 (aq) solution.

Fabrication and tribological behavior of MnO2/epoxy nanocomposites

“…The diffraction peak of MnO 2 can be indexed to the tetragonal α-MnO 2 single-crystal structure having a space group: I4/m (87) with lattice constants of a = 0.9815 nm, b = 0.9815 nm, and c = 0.2847 nm. The figure shows that the predominant peaks at 2θ values are 12.90°, [59][60][61][62][63] From the XRD data, it is confirmed the formation of MnO 2 nanosheets, and it is single-crystal α-MnO 2 . [59][60][61][62][63] The maximum diffraction peak occurs at 2θ ∼37.66°.…”

“…The figure shows that the predominant peaks at 2θ values are 12.90°, [59][60][61][62][63] From the XRD data, it is confirmed the formation of MnO 2 nanosheets, and it is single-crystal α-MnO 2 . [59][60][61][62][63] The maximum diffraction peak occurs at 2θ ∼37.66°. The formation of pure α-MnO 2 is confirmed by the absence of new peaks other than ascribed crystal planes.…”

The Role of Tetra Hybrid Reinforcements on the Behavior of Aluminum Metal Matrix Composites

“…As Mazen and Ahmed [41] and Dubey et al [42] discovered, the PM production approach provides higher consistency in the distribution of the reinforcing material, which reduces clustering and improves mechanical characteristics. The following are the steps in the powder metallurgy technique [43]. Powder mixing, powder compaction, and sintering process are the three essential phases in powder PM operation.…”

Optimization of MWCNTs/Al nanocomposite fabrication process parameters for mass density and hardness

“…The predicted GRG model may be (i) Linear, (ii) Quadratic, or (iii) Cubic to experimental GRG value. The relationship between the predicted GRG and the experimental GRG are given by equations ( 10) - (12) Predicted value for GRG ¼ 0:05,658 þ 0:8158 * Experimental value for GRG (10) Predicted value for GRG ¼ À0:2296 þ 1:797 * Experimental value for GRG À 0:7409 * Experimental value for GRG^2 (11) Predicted value for GRG ¼ 0:3367 À 1:296 * Experimental value for GRG þ 4:542 * Experimental value for GRG^2 À 2:780 * Experimental value for GRG^3 (12) The R 2 and adjusted R 2 values for the linear model are 0.887 and 0.88, respectively. Similarly, the R 2 and adjusted R 2 values for the quadratic model are 0.91 and 0.902, respectively.…”

“…But, pure Al does not have good mechanical 6 and tribological properties. 7 Carbon nanotubes (CNTs), discovered by Ijima, 8 have a high aspect ratio, 9 high physical, 10 mechanical, 11 tribological, 12 thermal, and electrical properties. 9 Reinforcement of a small amount of multiwalled carbon nanotubes (MWCNTs) into the Al matrix can lead to the fabrication of high-performance nanocomposites with enhanced properties.…”