Effect of Sintering Temperature on Properties of CNT/Al Composite Prepared by Capsule-Free Hot Isostatic Pressing Technique

Trinh, Pham Van; Luan, Nguyen Van; Minh, Phan Ngoc; Phuong, Doan Dinh

doi:10.1007/s12666-016-0886-8

Cited by 18 publications

(16 citation statements)

References 30 publications

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“…The more CNT clusters at higher CNT contents led to the more difficult for consolidation of the composites. Previous study has indicated that the existence of CNT clusters acts as barriers to restrict the particle boundary diffusion during sintering and hence limits the densification of the composites [9]. The results had also shown a higher relative density of ultrasonic-assisted compaction samples compared to the sample without ultrasonic-assisted compaction at the same CNT content.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 81%

“…Commercial carboxyl-functionalized multi-walled carbon nanotubes (MWCNTs -COOH) (95 % purity), supplied by Chengdu Organic Chemicals Co. Ltd., with 1.24 wt.% -COOH content, were used as reinforcement material. According to previous study, the density of multi-walled carbon nanotubes was calculated to be about 1.85 g/cm 3 [9]. The used CNTs were firstly ultrasonic dispersed in absolute ethanol for 3h to obtain an ethanol-CNTs suspension.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

“…This is resulted from the agglomeration of CNTs clusters in the Cu matrix. The weak bonding at the interface of Cu and CNTs clusters due to the poor wettability of CNTs with Cu will restrict the load transfer to CNT and therefore, it leads to a reduction of the reinforced effect of CNTs [2,3,9]. The more CNTs clusters were presented, the lower strength of the composite was achieved.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

“…An increasing of researches concerning with CNTs reinforced metal matrix composites (CNT-MMC) has been carried out in recent years. There are several techniques to fabricate CNT-MMC including powder metallurgy, electrodeposition, electroplating, melting and spray coating methods [3][4][5][6][7][8][9]. In which, powder route is the most popular method being used.…”

Section: Introductionmentioning

confidence: 99%

“…These CNT clusters will bring to an enhancement of porosity and a reduction of properties of composites. Several methods have been proposed to restrict the effect of these CNT clusters such as hot extrusion [7], hot isostatic pressing [9], spark plasma sintering [10,12] or severe plastic deformation [13,14] and the results have shown the improvement of density and properties of composites. Recently, ultrasonic have been used to obtain better dispersion of a range of nanomaterials including CNTs [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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EFFECT OF ULTRASONIC-ASSISTED COMPACTION ON DENSITY AND HARDNESS OF Cu-CNT NANOCOMPOSITES SINTERED BY CAPSULE-FREE HOT ISOSTATIC PRESSING

Trung¹,

Phuong²,

Luan³

et al. 2017

Acta Metall Slovaca

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Cu-CNTs composites were prepared with and without ultrasonic-assisted compaction in this work. The samples were sintered by capsule-free hot isostatic pressing at 920 o C and 50 MPa Ar gases. The results showed that the higher relative density and Brinell hardness were obtained for ultrasonic assisted compaction samples (at the same CNT content). For both cases, the highest hardness values was achieved at 0.5 wt.% CNT (49.2 HB and 45.8 HB for specimens with and without the ultrasonic-assisted compaction, respectively). The hardness was then decreased as the CNT content increased. The higher hardness values were resulted from higher densification of the sintered samples with ultrasonic-assisted compaction compared to the others.Keywords: Cu-CNT composites, carbon nanotubes, ultrasonic, compaction, hot isostatic pressing 1 Introduction Due to the unique properties of carbon nanotubes (CNT) such as high strength, good thermal conductivity and electrical properties, it's considered to be an ideal reinforcement for metal matrix composites [1][2][3]. An increasing of researches concerning with CNTs reinforced metal matrix composites (CNT-MMC) has been carried out in recent years. There are several techniques to fabricate CNT-MMC including powder metallurgy, electrodeposition, electroplating, melting and spray coating methods [3][4][5][6][7][8][9]. In which, powder route is the most popular method being used. The basic steps of the method include mixing CNT with metal powder (Al, Cu, Ni, etc.) via a mechanical alloying, and following by compaction and sintering. Up to date, the challenge is how to induce a uniform dispersion of CNT in metal matrix, especially, for high CNT amount. The strong van der Waal's force of attraction among CNT, the density discrepancy between CNT and metal matrix, the tendency to agglomeration and tangle together of CNT are attributed to the poor dispersion of CNT in the metal matrix. Besides that the weak interface bonding between CNT and metal matrices due to the poor wettability characteristic of CNT with metal matrices also restrict the incorporation of CNT with metal matrix. And so, these cause the reduction in their expected properties of the composites. Several methods have been proposed to improve the homogeneity

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Section: Experimental Materials and Proceduresmentioning

confidence: 81%

Section: Experimental Materials and Proceduresmentioning

confidence: 99%