Microstructure Characterization of Alumina/Carbon Nanotubes Composite Coating

Abstract

Alumina/carbon nanotubes (Al2O3/CNTs) composite coating was synthesized by plasma spray employing mixtures of Al2O3-coated CNTs and nano-sized α-Al2O3 at atmosphere. This coating was characterized for the microstructure and the composition by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), high resolution transmission electron microscopy (HRTEM), thermo gravimetric analysis (TG), differential scanning calorimetry analysis (DSC) and scanning electron microscopy (SEM). The results show that the thickness of the coating is about 0.5mm and the constituent elements were changed to α-Al2O3, CNTs and γ-Al2O3 duo to the superhigh temperature during the plasma spray process. The great mass of the mixtures were melted well and the CNTs were dispersed uniformly in the melted ceramic. The oxidation resistance and the microwave absorption properties were discussed simply to describe the functions of the composite coating.

Preparation and characterization of flexibility and lightweight CF-RGO composites

“…Among the pursued nanoscale fillers, carbon nanomaterials, one-dimensional (1D) carbon nanotubes (CNTs) and two dimensional (2D) graphene nanosheets (GNs) in particular, have received great attention coupled with extensive development effort due to their exclusive chemical structures and tunable electrical properties [6][7][8][9]. In the past decades, CNT-and GN-based nano-fillers with low percolation threshold and appropriated electrical loss have already demonstrated dramatically enhanced microwave absorption performance in the pursed composites [10][11][12][13][14]. Among various strategies, combination of electrical loss and magnetic loss has shown great potential owing to the excellent flexibility in manipulating complex permittivity and permeability, and thus has been extensively explored.…”