Study on the carbon nanotubes reinforced nanocomposite coatings

Abstract

One-dimensional nanocomposite coatings are a new generation of coatings, which have promising applications in versatile fields. In this study, the novel carbon nanotubes (CNTs) reinforced nanocomposite coatings were explored through two-step strategy using both physical vapour deposition (PVD) approach and chemical vapour deposition (CVD) approach. Vertically aligned CNT films were deposited by plasma enhanced CVD at 450 , while density of the VACNT films was modified by using Ag impregnated composite catalyst films. Subsequently, Pt-CNT, Ag-CNT and DLC-CNT nanocomposite coatings were explored to find a feasible way to achieve the well-designed composite structure. Morphologies and microstructures of these nanostructures were characterized by scanning electron microscopy, atomic force microscopy, transmission electron microscopy and Raman spectroscopy, while fourprobe tester was applied to evaluate the electrical conductivity of the nanocomposite coatings. The results indicated that well-composited DLC-CNT nanocomposite coating can be achieved which exhibited better electrical conductivity compare to that of the pristine DLC coating.

Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti13Nb13Zr Alloy

“…Carbon thin coatings continue to attract attention, fueled by their potential for industrial and commercial applications. Carbon nanotubes (CNTs) demonstrate unique properties, such as high aspect ratio, enhanced tensile (tensile strength up to 30 GPa [ 1 ]) and elastic properties (elastic modulus of 1 TPa or more [ 1 ]), and excellent electrical and thermal conductivity, resulting from their unique molecular structure and dependent on the synthesis method [ 2 ]. Extraordinary high mechanical properties led to extensive research on the use of CNTs as a reinforcing agent to produce composites [ 3 , 4 , 5 ] and laminar coatings [ 5 ] with various materials, such as Al 2 O 3 [ 6 , 7 , 8 ], hydroxyapatite (HAp) [ 4 , 9 , 10 , 11 , 12 , 13 ], titanium [ 4 ], titanium dioxide (TiO 2 ) [ 5 , 8 , 14 , 15 , 16 ], ultra-high molecular weight polyethylene (UHMWPE) [ 17 , 18 ], nickel [ 19 , 20 , 21 , 22 ], aluminum [ 23 , 24 , 25 ], chromium [ 26 ], and copper [ 22 ].…”

Synthesis and in-vitro antibacterial properties of a functionally graded Ag impregnated composite surface

“…The results indicated that the sputtered layer would not inhibit the diffusion of nitrogen. The S1 sample presents lower nitrogen concentration in the S-phase layer compare to that of S2 and S3 samples, which may due to the long deposition distance and the interference of the large Ag particles [31].…”

Ultrasonic Deposition of Carbon Nanotubes on Polycrystalline Cubic Boron Nitride Composites

“…Carbon nanotubes (CNT) are widely used in nanocomposite coatings in the automotive and electronics industry. Carbon nanotube has many beneficial properties, which include good tensile strength, good elastic properties, and excellent electrical and thermal conductivity [ 1 ]. It is worth noting that whilst excellent mechanical properties such as elastic modulus of >1 TPa are expected due to sp 2 hybridisation of C-C bonds, factors such as chirality and diameter of the CNTs also impact these properties [ 2 ].…”

“…For example, average elastic modulus of multi-walled carbon nanotubes (MWCNTs) has been reported between 350 [ 3 ] and 1800 GPa [ 4 ] and tensile strength between 11 and 63 GPa. State-of-the-art research [ 1 ] demonstrated that the performance of PcBN cutting tool materials can be improved by adding CNTs to different coating formulations through physical vapour deposition (PVD) processes. Enhanced wear resistance was reported, and hardness and yield strength increased by a factor of 1.3.…”