Nanodiamond as an effective reinforcing component for nano-copper

Livramento, V.; Correia, J.B.; Shohoji, Nobumitsu; Ōsawa, Eiji

doi:10.1016/j.diamond.2006.05.008

Cited by 55 publications

(36 citation statements)

References 11 publications

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“…The nDiamond powder was prepared by stirred-media milling as previously reported [11], after evaporating the water from the colloid at 65ºC for 24 h to remove 99% of water, which resulted in agglomerates with diameters of 2-3 μm. Pure elemental Cu was used as matrix (99.95% purity with particle size in the 44-149 μm range).…”

Section: Methodsmentioning

confidence: 99%

Production of Cu/diamond composites for first-wall heat sinks

Nunes

Correia

Carvalho³

et al. 2011

Fusion Engineering and Design

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Due to their suitable thermal conductivity and strength copper-based materials have been considered appropriate heat sinks for first wall panels in nuclear fusion devices. However, increased thermal conductivity and mechanical strength are demanded and the concept of property tailoring involved in the design of metal matrix composites advocates for the potential of nanodiamond dispersions in copper. Copper-nanodiamond composite materials can be produced by mechanical alloying followed by a consolidation operation. Yet, this powder metallurgy route poses several challenges: nanodiamond presents intrinsically difficult bonding with copper; contamination by milling media must be closely monitored; and full densification and microstructural homogeneity should be obtained with consolidation. The present line of work is aimed at an optimization of the processing conditions of Cu-nanodiamond composites. The challenges mentioned above have been addressed, respectively, by incorporating chromium in the matrix to form a stable carbide interlayer binding the two components; by assessing the contamination originating from the milling operation through particle-induced X-ray emission spectroscopy; and by comparing the densification obtained by spark plasma sintering with hot-extrusion data from previous studies.

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Section: Methodsmentioning

confidence: 99%

Production of Cu/diamond composites for first-wall heat sinks

Nunes

Correia

Carvalho³

et al. 2011

Fusion Engineering and Design

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“…In order to prevent oxidation of the powders, the containers were first evacuated and then back-filled with Argon. All the powder batches were characterised by X-ray diffraction (XRD), optical microscopy, field emission scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy analysis (EDS), and microhardness measurements (performed under a load of 25 g for 15 s for the as-milled powders and 50 g for 15 s, for the consolidated materials), as previously described [6]. The milled powders were encapsulated in stainless steel cans and consolidated by hot-rolling at 800°C or by Spark Plasma Sintering (SPS) at 800°C and also using both techniques of consolidation (first the powders were consolidated by SPS and then by hot-rolling).…”

Section: Methodsmentioning

confidence: 99%

Novel Approach to Plasma Facing Materials in Nuclear Fusion Reactors

Livramento¹,

Correia²,

Nunes³

et al. 2008

AIP Conference Proceedings

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Abstract.A novel material design in nuclear fusion reactors is proposed based on W-nDiamond nanostructured composites. Generally, a microstructure refined to the nanometer scale improves the mechanical strength due to modification of plasticity mechanisms. Moreover, highly specific grainboundary area raises the number of sites for annihilation of radiation induced defects. However, the low thermal stability of fine-grained and nanostructured materials demands the presence of particles at the grain boundaries that can delay coarsening by a pinning effect. As a result, the concept of a composite is promising in the field of nanostructured materials. The hardness of diamond renders nanodiamond dispersions excellent reinforcing and stabilization candidates and, in addition, diamond has extremely high thermal conductivity. Consequently, W-nDiamond nanocomposites are promising candidates for thermally stable first-wall materials. The proposed design involves the production of WAV-nDiamondAV-Cu/Cu layered castellations. The W, W-nDiamond and W-Cu layers are produced by mechanical alloying followed by a consolidation route that combines hot rolling with spark plasma sintering (SPS). Layer welding is achieved by spark plasma sintering. The present work describes the mechanical alloying processsing and consolidation route used to produce W-nDiamond composites, as well as microstructural features and mechanical properties of the material produced Long term plasma exposure experiments are planned at ISTTOK and at FTU (Frascati).

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“…There are also some reported investigations on the utilization of nanodiamond particles as reinforcement in Cu matrix composites [20,27,28]. In these investigations, the difficulties in obtaining well-structured composites arising from both homogeneous dispersion of nanodiamond and deficient bonding between diamond and copper were explained [20,28].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and wear characterizations of Ultra-Dispersed Diamond (UDD) reinforced Cu-15 wt.% Ti composites fabricated via mechanical alloying and sintering

Kaftelen¹,

Öveçoğlu²

2017

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In this study, effects of ultra-dispersed nanodiamond content on the microstructure and wear properties of Cu-15 wt.% Ti matrix composite were investigated. Samples were prepared by mechanical alloying and sintering at 890• C for 2 h under H2 gas atmosphere. Microstructural changes and dry sliding wear characterizations of sintered samples were investigated by a field emission scanning electron microscope (FESEM), and their phase characteristics were carried out using X-ray diffractometer (XRD). Electron microscopy investigations revealed that a good bonding between nanodiamond particles and Cu matrix could not be maintained due to the formation of free copper layers and the presence of high oxygen amount at the interface. The results taken from worn surfaces showed that high content of nanodiamond (10 wt.%) with oxide particles led to low wear resistance due to poor bonding between Cu-15 wt.% Ti matrix and nanodiamond particles which were pulled out during dry sliding wear.K e y w o r d s : ultra-dispersed nanodiamond powders, microstructure, wear resistance

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Nanodiamond as an effective reinforcing component for nano-copper

Cited by 55 publications

References 11 publications

Production of Cu/diamond composites for first-wall heat sinks

Production of Cu/diamond composites for first-wall heat sinks

Novel Approach to Plasma Facing Materials in Nuclear Fusion Reactors

Microstructural and wear characterizations of Ultra-Dispersed Diamond (UDD) reinforced Cu-15 wt.% Ti composites fabricated via mechanical alloying and sintering

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