Study The Properties of Sintered Al-Composites Matrix Reinforced With Nano-Al Oxide And/Or Carbon Nano Tubes (original) (raw)
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Acta Physica Polonica A, 2017
In this study, the effects of sintering time on hardness and wear behaviour were investigated of carbon nanotubes reinforced aluminium matrix composites. 1% multi wall carbon nanotubes (90% purity with 9.5 nm in diameter, 1.5 µm in length) and gas atomized 7075 Al alloy powders were mechanical milled for 120 min in a planetary ball mill. Mechanical milled aluminium composite powders were cold pressed under 520 MPa. Pre-shaped samples were sintered in atmosphere controlled furnace at 580 • C for three different sintering times (1, 2, and 3 h). As a result of study, it was observed that the hardness values of composites were decreased with increasing sintering time and the weight loss was decreased. It was determined from worn surface SEM images that adhesive wear mechanisms were dominant.
Carbon Nano tube Reinforced Aluminium Matrix Nano-Composite: a Critical Review
2012
This review is performed mainly to study and summarize the research scenario on carbon nanotube aluminium matrix nano-composite (CNT-AMC) prepared by powder metallurgy route for a wide variety of applications such as aerospace, automobile and sport equipment industries. Many research have been carried out in utilizing CNTs as reinforcement for nano-composite material development on aluminium matrix. The challenge is to distribute CNT uniformly in the matrix to enhance the mechanical and wear properties in the service life of the material. The result showed that powder metallurgy is the simpler and cheaper way of making aluminiumnano-composite with uniform dispersion of CNTs and improved mechanical, wear and frictional properties. This paper summarized the research on carbon nanotube aluminiumnano-composite prepared using powder metallurgy route and clearly stated the importance and benefits of CNT-Al nano-composite on other materials.
Developments in the aluminum metal matrix composites reinforced by micro/nano particles – A review
Journal of Composite Materials, 2019
The micro/nano reinforced particle' aluminum metal matrix composites (Al-MMCs) are widely used in manufacturing sector due to lightweight , superior strength-to-weight ratio, better fracture toughness, improved fatigue, and tensile property, enhanced corrosion resistance to harsh environment, etc. This article provides an overview of the manufacturing processes and different reinforcing elements used during the synthesis of Al-MMCs. Generally, the reinforced particles like carbides, nitrides, and compounds of oxides are used. Different organic, inorganic, industrial and agricultural waste which can be used for reinforcement in the aluminum matrix is highlighted with their feasible applications. The common mechanical properties (i.e. hardness, tensile and compressive strength, etc.) reported by different researchers are thoroughly discussed with the aim to highlight the amount of reinforcement and improvement occurred during processing. The formation and methodology for mixing condition and sintering behaviour of Al-MMCs are discussed to impart knowledge about the processing circumstances in powder metallurgical route. The affecting conditions during operating and responsible factor for the tribological behaviour are deliberated in a precise manner to recognize the potentiality of reinforcing particles in Al-MMCs. Finally, the different shortcomings and future prospects of the Al-MMCs are given to encourage the future research directions.
EFFECT OF Al2O3 COATED Cu NANOPARTICLES ON PROPERTIES OF Al / Al2O3 COMPOSITES
Journal of Petroleum and Mining Engineering, 2020
Aluminum matrix composites reinforced with various contents of Al2O3 nanoparticles coated with Cu (0, 5, 10 and 15 wt. %) were prepared by powder metallurgy technique. Al2O3 particles are coated with 30 wt. % Cu by electroless deposition after surface activation using 10 wt. % silver. Appropriate amounts of Al and Al2O3 (coated with Cu) are well mixed in a ball mill (4:1 balls to powder ratio) for 6 h. Then, the mixture is sintered by hot pressing at 500oC under 700 MPa uniaxial pressure for 45min in argon atmosphere. Phase identification and microstructure of sintered samples are studied. The density, thermal expansion and mechanical properties were measured. Increasing Al2O3 nanoparticles coated with Cu highly influences composite samples. Good distribution of Al2O3 coated with Cu in the Al matrix and their improved wettability, improve the microstructure, hardness, compressive strength and thermal expansion properties. However, addition of Al2O3 coated with Cu shows a deteriorated effect on both densification and ductility.
Article, 2023
In this research, the effects of heat treatment and hybrid reinforcement ratio on the microstructural and mechanical properties of Al-4Cu nanocomposites containing MWCNT and nano Al 2 O 3p were investigated. First of all, the hybrid reinforced Al-4Cu nanocomposites were manufactured with the aid of mechanical alloying and microwave sintering. And then, they were subjected to various heat treatments; annealing and artificial aging at 170, 180 and 200 °C individually. After that, the microstructural observations were made using X-ray diffraction, optical microscope and scanning electron microscopes (SEMs). The secondary electrons (SE), back scattered electrons (BSE), energy dispersive X-ray (EDX) and elemental mapping analyses of the specimens were carried out with the aid of SEMs. In addition, the nanoindentation tests were done to get the nanohardness and elastic modulus of composites. Finally, the composites were subjected to the compression test to clarify their compressive properties. The Al 2 Cu and Al 4 C 3 precipitates were detected in the composite samples either annealed or peak-aged at 200 °C, while the intermetallic compound, Al 7 Cu 2 Fe, precipitated only in the aged samples. A significant increment in the nanohardness of composites was obtained with increasing reinforcement content. Moreover, the elastic modulus of annealed and peak-aged composites, reinforced with 15% hybrid reinforcement in volume, increased by 59% and 57%, respectively compared to the unreinforced alloy. Furthermore, the use of hybrid reinforcement in the alloy matrix allowed an improvement of compressive yield strength at the expense of compressive strain.
Journal of materials science and engineering, 2015
The nanocomposite based on carbon nanotubes/aluminum (CNT/Al) was one-step prepared by the DC arc discharge method under an argon/acetone mixed atmosphere. Synthesis was performed by arc plasma on a pure graphite rod, filled by aluminum powder as an anode and aluminum plate as a cathode. Discharge conditions of 85 A and 20 V were used at a pressure range of 375 to 750 Torr. The CNT/Al was characterized by Scanning Electron Microscopy with Energy Dispersive Spectroscopy; Transmission Electron Microscopy; Laser Diffraction Particle Size Analysis; X-Ray Diffraction; Raman Spectroscopy; Thermogravimetric Analysis; and, its reinforcement effect of the CNTs on the aluminum matrix was measured by Vickers microhardness test. This nanocomposite shows agglomerates of multiwalled carbon nanotubes filled with Al 4 C 3 and blended with aluminum particles; moreover, in the nanocomposites was found a hardness increase of 40% for nanocomposites with 1.0 wt.% of CNT/Al.
Aluminum alloys and aluminium based composites are used presently in engineering applications. Aluminium matrix composites are imparting such superior properties which are very difficult to achieve by any existing monolithic material. These composites (MMCs) pursued over other conventional materials in the field of aerospace, automotive and marine applications due to their outstanding improved properties. These materials are of much interest to the researchers from few decades. These composites primarily replaced ferrous based such as cast iron and alloyed high temperature nonferrous based materials such as brass or bronze alloys but because of their poor wear and seizure resistance, they were subjected to many experiments and the wear behavior of these composites were explored to a maximum extent and were reported by number of research scholars for the past couple of years. Properties of aluminum matrix composites are highly influenced by the type and geometry of reinforcement such as particle size, continues or discontinues fiber form. It also depends on the processing techniques adopted for the fabrication of aluminum matrix composites which also depends on many factors including type of matrix and reinforcement the extent of microstructural integrity desired and their structural, mechanical and thermal properties. Present paper reports an overview on synthesis routes or processing methods as solid or liquid state techniques used to produce specimens with different reinforcements including carbon nanotubes. Mechanical and tribological behavior and its challenges of aluminum matrix composites are discussed. © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 430
DEVELOPMENT OF ALUMINIUM MATRIX NANO COMPOSITE THROUGH POLYMERIC METHOD
Multiwalled Carbon nano tubes have emerged as promising reinforcement for metallic matrix for their exiting strength, stiffness as well as conductivity property. In this present work, Aluminium composites were produced by combining pure Aluminium powder and Multiwalled carbon nano tubes through Mechanical milling and polymeric method. Compaction was performed by using Hydraulic Press Equipment. Controlled Sintering Process can be used to strength of composites throughout the structure. Mechanical properties of aluminium composites at various proportions of reinforcements were investigated. Microstructure analysis was carried out to identify the in-situ formed particles present in the composites.
Materials & Design - MATER DESIGN, 2009
It is well known that Cu–Al2O3 nanocomposite materials have high potential for use in structural applications in which enhanced mechanical characteristics are required. Therefore, the present work is intended to produce nano-sized powder of Cu–Al2O3 nanocomposites, with various alumina contents, and to investigate their properties. Mechanochemical method with two different routes, were used to synthesize the Cu–Al2O3 nanocomposite powders. First, route-A was carried out by addition of Cu to aqueous solution of aluminum nitrate, and second, route-B was also carried out by addition of Cu to aqueous solution of aluminum nitrate and ammonium hydroxide. In both routes, the mixtures were heated in air and milled mechanically to get the oxides powders of CuO and Al2O3. The CuO was reduced in preferential hydrogen atmosphere into fine copper. The composite powders have been cold pressed into briquettes and sintered in hydrogen atmosphere. The structure and characteristics of powders as well...
CNT-Aluminum Metal Matrix Nanocomposites
2012
Carbon Nanotubes-Aluminum (CNT-Al) agglomerates were synthesized by DC arc discharge method under argon/acetone mixed atmosphere. Synthesis was performed by arc plasma on high pure graphite rod, filled by aluminum powder as anode and aluminum plate as cathode. Discharge conditions of 85 A and 20 V were used at a pressure range of 0.5 to 1 MPa. This new method allows obtaining nanotubes agglomerated with aluminum. Metal matrix composites were produced with this agglomerates dispersed in an aluminum matrix. Mixtures of CNT-Al agglomerates, 0.5 and 1.0 wt%, with Al powders were pressed and sintered at 625 oC. A poor dispersion of the agglomerates in the metal matrix was obtained. For both compositions large clusters were observed at aluminum grain boundary junctions. Although the poor dispersion of CNT in the composite, a 40% increase in hardness is obtained in the 1.0 wt% CNT agglomerates composite.