Production of copper–niobium carbide nanocomposite powders via mechanical alloying

Marques, M.T.; Livramento, V.; Correia, J.B.; Almeida, A.; Vilar, R.

doi:10.1016/j.msea.2005.03.090

Cited by 44 publications

(26 citation statements)

References 10 publications

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“…Details of the milling operation are reported in Ref. [5]. Different powder batches were produced with nominal compositions of 5, 10 and 20 vol.% NbC.…”

Section: Methodsmentioning

confidence: 99%

“…Takahashi [1] has synthesised copper alloys reinforced with NbC and TaC particles by MA. The in situ formation of the carbide phases was not observed in the as-milled powder but only after appropriate heat treatment in the temperature range 873-1323 K. Recently, Marques et al [5] have produced in-situ copper-niobium carbide (Cu-NbC) nanocomposites via mechanical alloying without additional heat treatment. The authors observed that relatively short milling time (less than 20 h) is sufficient to form NbC nanoparticles in a copper matrix.…”

Section: Introductionmentioning

confidence: 99%

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Study of early stages of Cu–NbC nanocomposite synthesis

Marques

Livramento

Correia

et al. 2007

Journal of Alloys and Compounds

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“…Details of the milling operation are reported in Ref. [5]. Different powder batches were produced with nominal compositions of 5, 10 and 20 vol.% NbC.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of early stages of Cu–NbC nanocomposite synthesis

Marques

Livramento

Correia

et al. 2007

Journal of Alloys and Compounds

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“…Samir et al 16 also used a copper composite in For the synthesis of niobium carbide with the copper addition high energy milling followed by sintering is the traditional route. In this process metallic copper and graphite are used as starting materials 17,18,19 . This methodology, however, leads to powders with larger particle sizes and require long processing times.…”

Section: Souza Et Almentioning

confidence: 99%

Synthesis and Characterization of Niobium Carbide with Copper Addition Obtained Via Gas Solid Reaction

et al. 2018

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The use of niobium containing materials' has gained much attention of the scientific community in the late years due its various applications in diverse fields. NbC is a highly versatile material. Copper addition may alter several of its properties, such as morphology, crystal structure etc. as well as enhance its catalytic behavior. Nanostructured NbC with copper addition synthesis' presented here had the precursor [(NH 4 ) 3 [NbO(C 2 O 4 ) 3 ] x H 2 O] as starting material, which was doped with Cu(NO 3 ) 2 at 5% and 10% (molar) ratios. Doped NbC was obtained via gas solid reaction in fixed bed reactor at lower temperature (980°C) and with shorter reaction time (2h) than traditional methods. Reaction products' were characterized by XRD, crystal sizes were estimated according to HWL method, and SEM, XRF, BET and laser particle size analysis were performed. XRD indicated the formation of NbC and Cu phases with cubic crystal structure of ~20nm. SEM showed slight morphological change upon increasing copper content, indicating a less porous structure, which is consistent with BET data (43.7m2 /g for 5%Cu-NbC and 37m 2 /g for the 10% Cu-NbC). Crystal size calculations showed that increasing dopant content particle sizes were also increased, probably due to the presence of the dopant, in some extent, in the crystal structure.

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“…These limitations are often circumvented by dispersing a stronger ceramic material in the copper matrix. In the literature, Al 2 O 3 [2,3], NbC [4], Fe 3 C [5], SiC [6], diamond [7][8][9] have commonly been used as reinforcements for Cu matrix. Among these, nanodiamond particles are quite attractive due to their unique mechanical and tribological properties, including extreme hardness and inertness to chemical attack [10][11][12].…”

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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Production of copper–niobium carbide nanocomposite powders via mechanical alloying

Cited by 44 publications

References 10 publications

Study of early stages of Cu–NbC nanocomposite synthesis

Study of early stages of Cu–NbC nanocomposite synthesis

Synthesis and Characterization of Niobium Carbide with Copper Addition Obtained Via Gas Solid Reaction

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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