Acquiring well balanced strength and ductility of Cu/CNTs composites with uniform dispersion of CNTs and strong interfacial bonding

Wang, Xinhua; Guo, Baisong; Ni, Song; Yi, Jianhong; Song, Min

doi:10.1016/j.msea.2018.07.046

Cited by 37 publications

(14 citation statements)

References 42 publications

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“…The shifting of the D-band to higher wavenumbers indicated a charge transfer process, which suggested the presence of a chemical interaction between the ε-AgZn 3 phase and the CNT’s surface. Moreover, the shifting of the G-band to higher wavenumbers was due to the cumulative effect of Zn and/or Ag, leading to the distortion of the sp 2 bond structure of CNTs . In addition, the I D / I G values of CNTs, LPBF-prepared Zn-CNTs, and Zn-CNTs@Ag were calculated to be approximately 0.99, 0.97, and 0.96, respectively, indicating the structural integrity of CNTs during laser melting.…”

Section: Resultsmentioning

confidence: 98%

“…As for CNTs@Ag, the D-band and G-band shifted to about 1321 and 1559 cm –1 , respectively, which was due to the charge transfer and chemical interaction between Ag and CNTs . In general, the intensity ratio ( I D / I G ) was regarded as a criterion to evaluate the defect density of CNTs . The I D / I G ratio of CNTs and CNTs@Ag were both approximately 0.99, indicating that the in situ reduction did not induce structural damage on CNTs.…”

Section: Resultsmentioning

confidence: 99%

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Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Shuai

Dong

Yang

et al. 2021

ACS Biomater. Sci. Eng.

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Zinc shows promise for bone repair applications, while its strength and ductility require to be improved. Carbon nanotubes (CNTs) are exceptional reinforcements due to their superior strength, ultrahigh Young’s modulus, and large aspect ratio. However, their strong agglomeration and weak interfacial bonding with the matrix are key bottleneck problems restricting the reinforcing effect. In this study, Ag nanoparticles were in situ reduced on CNTs and then the CNT@Ag powders were used to prepare Zn-CNT@Ag implants by laser powder bed fusion. Results showed that Ag reacted with Zn to form a “knot”-like AgZn3 phase. It had the same lattice structure (HCP) with Zn, which indicated a good lattice matching with the matrix, thus improving the dispersion of CNTs. More significantly, the knot played a “rivet” role and enhanced the load transfer capacity, which advantaged the CNT strengthening effects by assisting in transferring the load. Moreover, it enhanced the heterogeneous nucleation effects during solidification, which weakened the texture strength of the matrix and thus increased the ductility by improving the sliding capacity. The compressive yield strength, ultimate tensile strength, and elongation of the Zn-CNT@Ag implant were increased by 22, 26, and 17% in comparison to Zn-CNTs. Moreover, the Zn-CNT@Ag implant exhibited favorable antibacterial activity with a bacterial inhibition rate of 87.79%. Additionally, it also exhibited a suitable degradation rate and acceptable biocompatibility.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Shuai

Dong

Yang

et al. 2021

ACS Biomater. Sci. Eng.

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“…[ 52 ] The lower the ratio, the better the graphitization of carbon nanotubes. [ 53 ] The results show that the I D / I G values of CNTs/Cu – Al 2 O 3 (0.12) and CNTs/Cu – Al 2 O 3 (0.6) composite powders in the figure are 0.80 and 0.84, respectively. Under the same growth conditions, more carbon nanotubes were formed on the surface of Cu – Al 2 O 3 (0.6) powders, so the overall quality of CNTs was slightly lower than that of CNTs/Cu – Al 2 O 3 (0.12) powders, but the difference was not significant.…”

Section: Resultsmentioning

confidence: 99%

“…Interfacial bonding has a very important influence on the properties of copper‐based carbon nanotube composites. [ 53,56 ] There are no obvious physical gaps or other defects between the CNTs and the copper matrix, but they are tightly bonded. It shows a strong interfacial bonding between the copper matrix and CNTs in the composites, which ensures the effective transfer of load and improves the properties of the composites.…”

Section: Resultsmentioning

confidence: 99%

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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“…Recently, the studies have been noticed and developed in using CNTs for MMCs. Numerous published studies have demonstrated that CNTs can improve the mechanical, thermal and electrical properties of metals and alloys such as aluminum [6][7][8][9][10], copper [11][12][13][14][15], magnesium [16,17] and nickel [18]. Among metals and alloys, titanium and titanium alloys have lightweight, good corrosion resistance, high melting point, biological compatibility and good mechanical properties even at freezing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of MWCNT/Ti6Al4V composites consolidated by vacuum sintering

et al. 2020

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Ti6Al4V alloys with low weight, high corrosion resistance, high melting point, high biocompatibility and unique mechanical properties have been receiving great attention for wide applicability in many industry fields such as automobiles, aerospace and biomedical. However, Ti6Al4V tends to be easily oxidized at high temperature, exhibit low thermal conductivity, low hardness and low yield strength and thus have led to the limitation of applicability in many industries. In this study, we have fabricated Ti6Al4V matrix composites reinforced with multi-walled carbon nanotubes (MWCNT) to enhance the hardness and yield strength. Vacuum sintering technique has been used to prepare MWCNT/Ti6Al4V composites. Microstructural and phase studies indicated that the composite structure consists of two main phases including ?-Ti and ?-Ti and MWCNTs were uniformly dispersed in Ti6Al4V matrix. The relative density of composite decreases as the CNT content increases as resulted from the porous structure of the CNT, which limits the aggregation process of the composite. When the CNT content increased, the hardness and yield strength of the composite increased, reaching maximum values of 378 HV and 356 MPa with 2 vol.% MWCNTs, which are nearly 16 and 38% higher than those of Ti6Al4V alloy. The enhancement in hardness and compressive strength is attributed to the good mechanical properties of MWCNTs and load transfer effect from Ti6Al4V alloy matrix to reinforcement material.

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Acquiring well balanced strength and ductility of Cu/CNTs composites with uniform dispersion of CNTs and strong interfacial bonding

Cited by 37 publications

References 42 publications

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

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

Microstructure and mechanical properties of MWCNT/Ti6Al4V composites consolidated by vacuum sintering

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Acquiring well balanced strength and ductility of Cu/CNTs composites with uniform dispersion of CNTs and strong interfacial bonding

Cited by 37 publications

References 42 publications

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

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

Microstructure and mechanical properties of MWCNT/Ti6Al4V composites consolidated by vacuum sintering

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