Fabrication, mechanical properties and electrical conductivity of Al2O3 reinforced Cu/CNTs composites

Yu, Peng; Shi, Xiao Ming; Lu, Xin; Zhou, Chuan; Li, Yang; Liu, Zhi‐Wei; Liu, Bo Wen; Xu, Wei; Cheng, Junyi; Qu, Xuanhui

doi:10.1016/j.jallcom.2018.12.222

Cited by 102 publications

(31 citation statements)

References 38 publications

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“…It can be seen from the data in table 3 that at the same temperature, as the content of Al 2 O 3 whiskers increases, the corrosion current density generally increases first and then decreases. And it is able to see through the polarization curve in figure 7 that with the further increase of the potential, the anode curve does not show a clear peak, which indicates that the formed copper chloride salt film is unstable [24,25]. This shows that the protective film generated during the corrosion process has been destroyed, so the current density has not decreased.…”

Section: Methodsmentioning

confidence: 95%

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Jiang

Xiao

et al. 2020

Mater. Res. Express

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The corrosion behavior of copper matrix composites with different Al 2 O 3 whisker content in NaCl solution (3.6 wt%) at different temperatures was studied by electrochemical test and electron microscope. The results showed that with the increase of Al 2 O 3 whisker content, the corrosion tendency of the composites first increases and then decreases. The charge-transfer resistance (Rct) value and corrosion current density tend to decrease first and then rise slowly. The whiskers can cause huge differences in performance in different directions so that it is easy to agglomerate and entangle in the matrix, which can increase the heterogeneity of materials in copper matrix alloys, hence, the addition of whiskers will cause the increase of corrosion phenomenon. As the whisker content continues to increase, a large number of reinforcing phases will form a natural protective layer when exposed on the metal surface, which will slow down the corrosion situation. As the temperature increases, the corrosion resistance decreases first and then increases. When the temperature increases from 25°C to 50°C, the electrochemical reaction is accelerated, the free electrons between the metal atoms obtain external energy, the ion migration rate is accelerated, and the corrosion reaction is more likely to occur. When the temperature increases from 50°C to 75°C, the corrosion reaction rate is mainly controlled by the diffusion of oxygen. As the temperature increases, the solubility of oxygen decreases and the cathode reaction requires oxygen to participate, consequently, the corrosion rate decreases. For the microstructure of the corrosion specimen, corrosion mainly occurred at or around the reinforcement phase/matrix interface. Intermetallic compound particles often appear near corrosion initiation points along the reinforcement phase/matrix interface, and the corrosion behavior of composites is mainly determined by copper. Copper is used as the anode of the battery, and the corrosion products are mainly copper chloride salts.

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Section: Methodsmentioning

confidence: 95%

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Jiang

Xiao

et al. 2020

Mater. Res. Express

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“…It is clear that the composite matrix has more refining grains and more orderly texture. This enhancement in microstructure related to the ability of the Al phase to induce the formation of the physical bonding between CNTs and Cu phases that play a necessary factor in developing the physical and mechanical characteristics [12,20]. Figure 6b reveals the EDX elemental analysis of a very dark black zone that appears in the SEM micrograph in Fig.…”

Section: Microstructure and Phases Characteristicsmentioning

confidence: 99%

“…The electrical resistivity and/or electric conductivity of tested alloys was measured by Motwane Digital Micro ohm meter (LR-2045) which is capable of measuring very low resistances in micro ohm as low as 0.1 μΩ. Then, the electric conductivity (σ) is dependent on electrical resistance (R) of the specimen was evaluated using the following formula [18,20].…”

Section: Microstructural Characterization and Measurementsmentioning

confidence: 99%

“…Also, the addition of the Al 2 O 3 nanoparticles has more effective hardening than the addition of CNTs. The CNTs have low bonding behavior with the AB composite alloy owing to its poor wetting with the Cu phase as well as their large surface area prohibits the motion of Cu or Al atoms during sintering process [18,20]. Moreover, Fig.…”

Section: Microstructure and Phases Characteristicsmentioning

confidence: 99%

“…These findings can be interpreted according to the different magnitudes of the thermal expansion coefficient (CTE) of ingredients and the AB matrix. Also, the large alteration between the density of AB Matrix (7.56 g/cm 3 ) and their additives ( Al 2 O 2 = 3.98 g/cm 3 and CNTs = 1.8 g/cm 3 ) lead to a decrement of the density of the composite alloys [20]. Thus, the augment in the density of AB/Al 2 O 3 /CNTs alloy owing to merging a minor amount of CNTs that gives a uniform dispersion plus the adding of Al 2 O 3 NP leads to enhance density due to filling up the intrinsic voids of AB alloy.…”

Section: Microstructure and Phases Characteristicsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of individual and hybrid additions of Al2O3 NP and CNTs on the mechanical strengthening of aluminum-bronze alloy

Eid

Ragab

2020

SN Appl. Sci.

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Aluminum bronze metallic composite (ABMCs) alloys were fabricated via the powder metallurgy technique. The present work has been incorporated an individual as well as hybrid additions of Al 2 O 3 nanoparticles and multiwall carbon nanotubes (CNTs) into ABMCs. Microstructural characteristics and mechanical properties and sliding wear behavior plus some of the physical properties such as density, electrical conductivity, and thermal conductivity of the composite alloys have been studied. Microstructure features were discovered by utilizing FE-SEM and XRD measurements. The addition of 2 wt% of CNTs was caused more uniform distributed refined grains, but the adding of 2 wt% Al 2 O 3 was formed an agglomeration upon the active grain boundaries. Moreover, the yield stress and ultimate tensile strength of AB/Al 2 O 3 / CNTs hybrid composite alloy were improved up to ≈ 84% and ≈ 52%, respectively with respect to the plain monolithic alloy. Also, the hybrid addition enhanced both hardness and wear resistance by ≈ 12% and ≈ 189%, respectively. This enhancement may be attributed to the physical synergistic reinforcement of the hybrid addition and improvement of the internal microstructure as well as the Zener pinning effect which restricted the growth of the grains. Additionally, the addition of 2 wt% CNTs enhanced the electrical and thermal conductivity up to ≈ 5.3% and ≈ 22.8, respectively. Because the CNTs creating new conductive paths in the Aluminum bronze alloy.

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Preparation and Mechanical Properties of Copper Matrix Composites Reinforced by Carbon Nanotubes and Al₂O₃

et al. 2021

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CNTs/Cu‐Al2O3 composites are successfully prepared by internal oxidation, chemical vapor deposition and spark plasma sintering (SPS) method. The influence of Al content (0.12 and 0.6 wt%) on the morphology of grown carbon nanotubes and the mechanical properties of composites are systematically studied. The results show that under the same growth process, more carbon nanotubes are obtained on the surface of the powders with 0.6 wt% Al content. The CNTs/Cu‐Al2O3 composites with 0.12 wt% Al content displays higher mechanical properties, the tensile strength is 280 MPa, and the micro‐hardness is 123.3 HV, which is increased by 40.7 and 78.2% in contrast with that of pure copper, respectively. Moreover, the electrical conductivity of CNTs/Cu‐Al2O3 (Al content is 0.12 wt%) composites is still at the high level of 83.2% IACS. This work uses chemical vapor deposition to improve the dispersion and interfacial bonding of CNTs in the matrix and increase the properties of the composites, which provides a new idea for the preparation of high strength metal matrix composites.

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Fabrication, mechanical properties and electrical conductivity of Al2O3 reinforced Cu/CNTs composites

Cited by 102 publications

References 38 publications

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Effect of individual and hybrid additions of Al2O3 NP and CNTs on the mechanical strengthening of aluminum-bronze alloy

Preparation and Mechanical Properties of Copper Matrix Composites Reinforced by Carbon Nanotubes and Al₂O₃

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Fabrication, mechanical properties and electrical conductivity of Al2O3 reinforced Cu/CNTs composites

Cited by 102 publications

References 38 publications

Study on corrosion resistance of copper matrix composites reinforced by Al2O3 whiskers

Study on corrosion resistance of copper matrix composites reinforced by Al2O3 whiskers

Effect of individual and hybrid additions of Al2O3 NP and CNTs on the mechanical strengthening of aluminum-bronze alloy

Preparation and Mechanical Properties of Copper Matrix Composites Reinforced by Carbon Nanotubes and Al2O3

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Product

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Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Study on corrosion resistance of copper matrix composites reinforced by Al₂O₃ whiskers

Preparation and Mechanical Properties of Copper Matrix Composites Reinforced by Carbon Nanotubes and Al₂O₃