High-energy ball milling (HEBM) combined with powder metallurgy route was used to fabricate carbon nanotube (CNT) reinforced 7055Al composites. Two powder morphology evolution processes (HEBM-1 and HEBM-2) were designed to investigate the dispersion and damage of CNTs during HEBM process. HEBM-1 evolution process involved …
During high energy ball milling, nano-reinforcements can be gradually dispersed in metal powders with the severe plastic deformation of metal powder particles. However, prolonged deformation soon results in intrinsic cold-welding of metal powder particles, leading to unpleasant dispersion effect and great difficulty in dispersing high …
To evaluate the mixing effectiveness of dry ball-milling, multi-walled carbon nanotubes were ball-milled with boron carbide powder, and the resulting mixtures were hot pressed to consolidated tiles. Density, hardness, Young's modulus, and fracture strength of the tiles were measured; all decreased with increasing nanotube content.
Bimodal carbon nanotube reinforced 2009Al (CNT/2009Al) composites were fabricated by powder metallurgy followed with extrusion. It indicated that the width, length and grain size in the coarse grain (CG) bands increased with the increase of the extrusion temperature, while no obvious grain size change was observed in the ultra-fine grain …
This investigation is motivated by increasing interest in ferrimagnetic materials and composites, which exhibit electrical capacitance. It addresses the need for the development of magnetic materials with enhanced capacitive properties and low electrical resistance. γ-Fe2O3-multiwalled carbon nanotube (MWCNT) composites are developed …
In order to overcome the limitations of standard ball-mill mixing processes to fabricate a uniformly dispersed carbon nanotube (CNT) reinforcement composite without damaging CNTs in matrix powder, a unique and easy solution-mixing process was developed. The present study aims to synthesize Al-0.5 wt % CNT composites using …
The recent advancements in carbon nanotube (CNT) science have opened up promising possibilities for the development of novel materials and devices in the biomedical field . ... The ball-milling treatment breaks the tubes, being responsible for the increase in the surface area observed for sample p-BM . In the case of the sample f-BM, …
In the present work, the flake powder metallurgy as a slurry based method and the ultrasound-assisted then ball milling as a semi-wet based route were applied to modify the carbon nanotube dispersion within the aluminium powder.For this purpose, two types of long and short fiber CNTs-COOH were selected as reinforcement to strengthen …
Aluminum matrix composites reinforced by carbon nanotubes (CNTs) were fabricated by ball-milling (with aluminum powder; average diameter 30 µm), followed by hot extrusion of the powders encapsulated in aluminum containers (at 550° with an extrusion ratio of 9).The CNTs were intended to improve the mechanical properties and …
Ball milling, also called mechanical alloying, is a favorable technique for generation of equilibrium and non-equilibrium materials, like the amorphous or nanocrystalline materials. ... In a group of experiments for observation on evolution of carbon nanotube structure, milling times of 5 min, 10 min, 15 min and 60 min were …
Synthesis and growth of boron nitride nanotubes by a ball milling–annealing process. Acta Materialia 59, 2807–2813 (2011). Article CAS Google Scholar Zhong, B. et al. Large-scale fabrication ...
Therefore, many researchers attempted to optimize the ball milling process of Al-CNT powder mixtures with varied milling regimes [2], [6], [8], [11], [12].Choi et al. [11] reported that lower ball milling speed led to slower flattening of Al and less damage to CNTs. When the flattening of Al continued for several hours, CNTs could be uniformly …
Fig. 2 shows the morphologies of milled mixture powders under different ball-milling times. It can be seen that more mixture powders became flattened as the ball-milling time increased from 2 to 8 h, which was caused by the shearing effect of the balls.The largest surface areas were achieved in the 8 h ball-milled mixture powders, …
Several TiO 2-carbon nanotube composites were prepared by ball milling procedure. Prepared materials were characterized by several techniques, including N 2 equilibrium adsorption isotherms, thermogravimetric analysis, elemental analysis, X-ray diffraction spectra and transmission emission microscopy, and tested in the …
High-energy ball milling (HEBM) combined with powder metallurgy route was used to fabricate carbon nanotube (CNT) reinforced 7055Al composites. Two powder …
The dependence of multiwall carbon nanotube (MWCNT) length distribution and some nitrogen derived morphological descriptors on various planetary ball milling process parameters was investigated. Ball milling was found to cut nanotubes into smaller pieces, narrow their length distribution and increase their specific surface area and …
In this work, the effects of a functionalization method involving different conditions and milling processes on the dispersion and thermal and electrical conductivity of multiwalled carbon nanotubes were studied. The surfaces of MWCNTs were modified using a mixture of sulfuric and nitric acid as an acid treatment and …
Iron- and nitrogen-doped carbon-based catalysts are one of the most promising alternatives to platinum-group metal-based ones currently used in the fuel cell industry. Here, we study the effect of ball …
The high energy ball milling process has been considered as an effective dispersion technique to achieve well-dispersed MWCNTs-reinforced composite powders for further processing ... Spark plasma extrusion (SPE) of ball-milled aluminum and carbon nanotube reinforced aluminum composite powders. Composites A, 41 (2010), pp. 322 …
It has been reported that CNT/Co was obtained through a ball-milling treatment at a lower speed of 450 r min −1 for 10 h, which reached the capacity of 402.5 mAh g −1 (1.48 wt% hydrogen) for electrochemical hydrogen storage [12]pared with the theoretical hydrogen storage capacities of individual metal Co (3.32 wt% hydrogen) …
Ball milling of carbon nanotubes (CNTs) in the dry state is a common way to produce tailored CNT materials for composite applications, especially to adjust nanotube lengths. For Nanocyl TM NC7000 nanotube material before and after milling for 5 and 10 h the length distributions were quantified using TEM analysis, showing decreases of the …
There has been an increase in interest in developing functional polymer composites based on green chemistry principles. The purpose of this study was to investigate the preparation of functional …
Ball milling–annealing method, which was proposed by Chen et al. [11], afforded a new approach for producing mass quantities BNNTs. ... Fig. 5 (b) and (c) shows the EDS spectrum of the metal nanoparticles located at the tip of large diameter nanotube and small diameter nanotube respectively. Strong peak of Fe, Ni, Cr and Al, Si, Cr was ...
Fabrication and mechanical properties of CNT/Al composites via shift-speed ball milling and hot-rolling - Volume 34 Issue 15 ... Anisotropy of the Wear Behavior for Carbon Nanotube-Reinforced 6061Al Composites. Acta Metallurgica Sinica (English Letters), Vol. 36, Issue. 5, p. 814. CrossRef;
The influence of ball-milling in the texture and surface chemistry of multi-walled carbon nanotubes (MWCNT) was studied in this work. Treatment times up to 360 min at constant frequency (15 vibrations/s) and frequencies from 10 to 20 vibrations/s during 30 min were used for the preparation of the modified samples.These were …
The powder metallurgy (PM) processes have undergone significant advancements with the use of ball milling (BM), facilitating the production of UFG alloys and composites exhibiting improved microstructural and mechanical features [[1], [2], [3]].In general, the deformation process of Al powders during BM can be characterized as …
Fig. 3 (a) and (b) shows the morphologies of the pure Cu and the 3 vol.% CNT/ Cu composite powders obtained after ball milling. As a result of the ball-powder-ball collisions, all two types of powders have a flattened disk shape with rugged edges. Fig. 3 (c) shows that MWCNTs have been well implanted into the copper powders. Some …
Iron- and nitrogen-doped carbon-based catalysts are one of the most promising alternatives to platinum-group metal-based ones currently used in the fuel cell industry. Here, we study the effect of ball-milling conditions and compositions of catalyst precursors comprising a silicon carbide-derived carbon (CDC) on the properties of the …
With ball milling time further increased to 16 h (Fig. 6 g) and then 24 h (Fig. 6 h), the morphology of CNTs/Al composite powder gradually converted to spheres. ... Synthesis of carbon nanotube reinforced aluminum composite powder (CNT-Al) by polymer pyrolysis chemical vapor deposition (PP-CVD) coupled high energy ball milling (HEBM) …
In this work, a cost effective and easy method to prepare N-doped carbon nanotubes by ball milling was developed, which avoids the use of solvents and …
BNNTs are the carbon nanotube BN analog, a one-dimensional high aspect ratio nanostructure of hexagonal boron nitride (h-BN), where the boron and nitrogen atoms …
