Mechanosynthesis of nanostructured composites copper-fullerite, copper-graphite

Larionova, N. S.; Ніконова, Р. М.; Lad’yanov, V. I.

doi:10.1016/j.apt.2017.11.027

Cited by 23 publications

(7 citation statements)

References 24 publications

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“…The dependence of the hardness has a maximum at 0.5 wt. % FS attaining a value of 160 ± 4 HB, which is higher than the majority of the data reported earlier for any Cu-C composites [ 1 , 2 , 3 , 4 , 5 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. A further increase of FS concentration leads to the hardness falling down to 75 HB that may be explained by increase of Cu-boundaries quantity and appearance of soft FS agglomerates due to its inhomogeneous distribution.…”

Section: Resultscontrasting

confidence: 58%

“…We assume that the decreased carbon concentration may be explained by an interaction of FS with surface copper oxide and the formation of volatile carbon containing product, which is removed through open pores during hot pressing. Reduction of the copper oxide by carbon during milling has been described in [ 30 ] and was observed in [ 28 ] as well. The reduction induces copper recrystallization, which explains the microstructure of the boundaries.…”

Section: Resultsmentioning

confidence: 88%

“…However, to date, Cu-based composites with fullerene additions are barely discussed in the literature. In the recent work in [ 28 ], the influence of fullerene additions on structure and phase composition of Cu-C composite powders was discussed, but properties of compacted materials were not studied. Another type of carbon material, which may be considered a reinforcement to Cu-based composites, is fullerene soot (FS).…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Fullerene Soot Nanoparticles on the Microstructure and Properties of Copper-Based Composites

et al. 2020

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Copper-based composite materials strengthened with nanosized fullerene soot particles were produced by mechanical milling and hot pressing technology with a content of carbon up to 5 wt. %. The microstructure of the composite powders and the compacts prepared using them were examined by light microscopy, SEM, EDS, XRD, and XPS; hardness, heat conductivity, and tribological characteristics were measured. The interesting feature of the observed microstructure was a “marble” pattern formed by a white boundary net. The study shows homogeneous distribution of carbon inside the copper grains and its lower concentration in the grain boundaries. The effect was caused by a reaction of carbon with oxygen adsorbed by the copper particles surface. The maximal hardness of the material is 160 HB for the sample with 0.5 wt. % of fullerene soot; this material has the minimal friction coefficient (0.12) and wear in a dry friction condition. Heat conductivity of the material (Cu-0.5 wt. % C) is 288 W/m*K.

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Section: Resultscontrasting

confidence: 58%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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The Effect of Fullerene Soot Nanoparticles on the Microstructure and Properties of Copper-Based Composites

et al. 2020

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“…Окрім цього, відсутність характерного піку від кристалічного графіту при 2θ = 31° (d 002 = 0,3347 нм) на дифракційних картинках від порошків Al-17Cu/5C та Al-33Cu/5C після 8 годин МЛ (рис. 4, в, г) може бути пов'язана із перетворенням кристалічного графіту на аморфний під дією високоенергетичної обробки [38]. Аналіз всіх дифрактограм порошків після МЛ також засвідчує про відсутність піків від будь-яких оксидів та карбіду Al 4 C 3 .…”

Section: мікроструктура порошків після млunclassified

Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

Matvienko¹,

Поліщук²,

Rud³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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левих фаз. Розглянуто вплив графітових добавок та вмісту Cu (17 і 33% ваг.) на мікроструктуру та механічні властивості спечених композитів Al-Cu. Обговорюються можливі механізми зміцнення композитів Al-Cu і Al-Cu/C. Ключові слова: Al-Cu/C, металоматричні композити, механічне легування, твердофазне спікання, порошкова металургія. Hypoeutectic and eutectic Al-Cu composites with 5% wt. of graphite additives are prepared using mechanical alloying (MA) of elemental powders and following hot pressing of mixtures at 480-510°C and 30 MPa. The obtained powders and sintered samples are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The MA during 8 hours of all powder compositions results in the formation of Cu 9 Al 4 and CuAl 2 phases as well as Al(Cu) solid solution. Subsequent sintering leads to the decomposition of the metastable Cu 9 Al 4 phase. As shown, the crystalline structure of graphite additives transforms into amorphous one during MA, while the consequent sintering results in the Al 4 C 3 carbide formation. Moreover, the introduction of graphite additives leads to increasing of both the highly dispersed particles amount in mechanically alloyed powder and the volume fraction of metastable Cu 9 Al 4 and stable CuAl 2 intermetallic phases. The effects of both graphite additives and Cu content (17 and 33% wt.) on microstructure and mechanical properties of sintered Al-Cu composites are considered. Possible strengthening mechanisms for Al-Cu and Al-Cu/C composites are discussed.

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“…Дифрактограммы (а) и их фрагменты с пиком (111) Al (б) порошков Al-33Cu в исходном состоянии, после МЛ и отжига при 500°С. (002) графита на углах 2θ = 31° (d 002 = 0,3347 нм) не был обнаружен, можно предположить, что кристаллический графит трансформируется в аморфный [32].…”

Section: экспериментальная методикаunclassified

Phase Transformations during Mechanical Alloying of Powders with Eutectic Composition of Al–Cu and Al–Cu/C Systems and Their Effect on the Structure and Mechanical Properties of the Composites

Matvienko¹,

Rud²,

Поліщук³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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Mechanosynthesis of nanostructured composites copper-fullerite, copper-graphite

Cited by 23 publications

References 24 publications

The Effect of Fullerene Soot Nanoparticles on the Microstructure and Properties of Copper-Based Composites

The Effect of Fullerene Soot Nanoparticles on the Microstructure and Properties of Copper-Based Composites

Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

Phase Transformations during Mechanical Alloying of Powders with Eutectic Composition of Al–Cu and Al–Cu/C Systems and Their Effect on the Structure and Mechanical Properties of the Composites

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