Fabrication of Carbon Nanotube/ Aluminum Matrix Functionally Graded Materials Using Centrifugal Slurry Methods

Carbon nanotube (CNT) has received broad scientific and industrial attention due to their excellent mechanical and functional properties. However, CNT has not been effectively used for high performance composites because of degradation of mechanical properties due to insufficient dispersibility of CNT in the matrix. In this study, CNT/ aluminum (Al) matrix functionally graded materials (FGMs) have been focused on. The processes of dispersion of CNT have been carried out with the solvent of dimethylacetamide, and the dispersing agent of potassium carbonate, which is an inorganic salt, under ultrasonic sonication conditions. Centrifugal slurry methods have been applied to obtain gradient of content of CNT in CNT/ Al matrix FGMs. Tribological characteristics on CNT/ Al matrix FGMs have been investigated using a ball-on-disk tribometer. It has been demonstrated that CNT contributes to enhance wear resistances.

Download Full-text

Tribological Characterization of Carbon Nanotube/Aluminum Functionally Graded Materials Fabricated by Centrifugal Slurry Methods

Journal of Composites Science ◽

10.3390/jcs5100254 ◽

2021 ◽

Vol 5 (10) ◽

pp. 254

Author(s):

Hideaki Tsukamoto

Keyword(s):

Mechanical Properties ◽

Carbon Nanotube ◽

Functionally Graded Materials ◽

Potassium Carbonate ◽

High Performance ◽

Functionally Graded ◽

Graded Materials ◽

Tribological Characterization ◽

Al Matrix

Although carbon nanotube (CNT) is a promising material due to its excellent mechanical and functional properties, CNT has not been effectively used for high performance composites due to the degradation of its mechanical properties as a result of insufficient dispersibility of CNT in its matrix. In this study, CNT/aluminum (Al) matrix functionally graded materials (FGMs) were fabricated by centrifugal slurry methods. The dispersion of CNT was carried out with the solvent of dimethylacetamide (DMAs), and the dispersant of potassium carbonate (K2CO3) under ultrasonic sonication conditions. Tribological characteristics on the FGMs were investigated using a ball-on-disk tribometer. It was demonstrated that the presence of CNT contributed to an increase of the coefficients of friction and an enhancement of wear resistances.

Download Full-text

Effects of Particle Size on Fabrication of Al-TiO2 Functionally Graded Materials by Centrifugal Mixed-Powder Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.1691 ◽

2016 ◽

Vol 879 ◽

pp. 1691-1697 ◽

Cited By ~ 2

Author(s):

Hisashi Sato ◽

Junya Maeda ◽

Motoko Yamada ◽

Yoshimi Watanabe

Keyword(s):

Particle Size ◽

Wear Resistance ◽

Functionally Graded Materials ◽

Casting Process ◽

Functionally Graded ◽

The Other ◽

Mixed Powder ◽

Graded Materials ◽

Powder Method ◽

Al Matrix

As one of processing methods of functionally graded materials (FGMs), centrifugal mixed-powder method has been proposed. The centrifugal mixed-powder method is the casting process combined of centrifugal casting and powder metallurgy. This processing method has advantage that fine ceramics-particles, whose wettability with matrix melt is low, can be compounded into metallic material. However, effects of particle size on microstructure and mechanical properties of the FGMs fabricated by the centrifugal mixed-powder method are unclear. In this study, two kinds of Al-TiO2 FGMs rings are fabricated by the centrifugal mixed-powder method. One contains TiO2 particles having similar diameter with Al matrix particles (hereafter, small different-size (SD) TiO2 particles), and the other one compounds TiO2 particles with much smaller diameter than Al matrix particles (hereafter, large different-size (LD) TiO2 particles). In case of the Al-TiO2 FGMs ring containing SD-TiO2 particles, the TiO2 particles are homogeneously dispersed in Al matrix on outer surface of the ring. On the other hand, the TiO2 particles in the Al-TiO2 FGMs ring with LD-TiO2 particles are distributed along grain boundary of Al matrix. Moreover, Vickers-hardness and wear resistance around outer surface of the Al-TiO2 FGMs ring containing the SD-TiO2 particles is higher than that of the Al-TiO2 FGMs ring with LD-TiO2 particles. Since Al particles in the mixed-powder with LD-TiO2 particles are surrounded by the TiO2 particles, the Al particles can be hardly melted by heat of molten Al at casting process. As a result, the Al-TiO2 FGMs ring with LD-TiO2 particles has low hardness and wear resistance. Therefore, it is found that TiO2 particles having similar diameter with Al matrix particles are more suitable for fabrication of the Al-TiO2 FGMs rings.

Download Full-text

Thermal Conduction Analysis of Carbon Nanotube Reinforced Aluminum Composite-Ceramic Functionally Graded Materials for High Technology Applications

Proceedings of the Ninth International Conference on Engineering Computational Technology ◽

10.4203/ccp.105.60 ◽

2014 ◽

Author(s):

S. Daviran ◽

S. Mohasseb ◽

P. Bakhshaei

Keyword(s):

Carbon Nanotube ◽

Functionally Graded Materials ◽

Thermal Conduction ◽

High Technology ◽

Composite Ceramic ◽

Functionally Graded ◽

Aluminum Composite ◽

Graded Materials ◽

Technology Applications

Download Full-text

Research on W/Cu Functionally Graded Materials as Divertor Material in China

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.1371 ◽

2005 ◽

Vol 475-479 ◽

pp. 1371-1376 ◽

Cited By ~ 1

Author(s):

Chang Chun Ge ◽

Zhang Jian Zhou

Keyword(s):

Melting Point ◽

Research And Development ◽

Functionally Graded Materials ◽

High Performance ◽

Functionally Graded ◽

Next Generation ◽

Graded Materials ◽

Processing Technologies

Tungsten has the highest sputtering threshold of all possible candidates and the highest melting point in metal. It will be the first candidate in selecting divertor materials. Great efforts are made on research and development on W/Cu functionally Graded Materials as high performance divertor material for next generation divertor-mounted Tokamak facilities in China recently. Four different processing technologies are used and compared and some results of evaluation of plasma-relevant characteristics of these materials are reported.

Download Full-text