Diamond synthesis in aluminum matrix in molten alkali-halide at ambient pressure

Yolshina, L.A.; Muradymov, R. V.; Вовкотруб, Э. Г.; Смирнов, С. В.

doi:10.1016/j.diamond.2015.02.005

Cited by 12 publications

(2 citation statements)

References 33 publications

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“…According to the data reported in [16][17][18][19][20], there exist various techniques of introducing carbon nanomaterials into a metal matrix: infiltration of liquid metal into the fibers [16], ball milling [17], implantation of carbon ions into the Al target [18], selective laser melting [19], SPD [20], etc. Among new experimental methods of obtaining graphenereinforced composites, one should mention the in sit synthesis of graphene nanoparticles from carbon-containing precursors directly in the metal matrix in molten salt media [21][22][23][24][25]. Among the key advantages of such a technique is the elimination of porosity, which is characteristic of composites produced ex situ, when previously obtained ultrafine nanoparticles are introduced into the metal matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on the Properties of Aluminum Matrix Composites with Graphene

Бродова

Yolshina²,

Разоренов³

et al. 2022

Metals

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The structure and mechanical properties of composites consisting of a metal matrix based on aluminum and its alloys of different compositions (AA-3003 and AA-5154) and graphene synthes sized in situ under a layer of molten salts were investigated depending on the chemical composition and grain size of the matrix. Aluminum matrix composites of three compositions were studied in as-cast coarse-grained, deformed fine-grained (grain size < 1 mm), and deformed sub microcrystalline (grain size < 1 μm) states in order to compare the structural characteristics of composites with different grain sizes. The composites were subjected to deformation with a split Hopkinson (Kolsky) bar and to dynamic-channel angular pressing. The hardness and dynamic mechanical properties of the composites were measured at strain rates ε˙ from 1.8 − 4.7 × 103 to 1.6 − 2.4 × 105 s−1. It was found that grain refinement induced a sharp increase in the hardness of composites with various compositions (by a factor of 1.6–2.6). A correlation of the elastic-plastic properties of the aluminum matrix composites with the grain sizes and chemical compositions of the matrices was established. A transition from coarse-grained to sub microcrystalline structure was shown to improve the elastic-plastic properties on average by a factor of 1.5. It was proved that the reinforcing effect of graphene increased with the decreasing grain size of the matrix. Mechanisms of reinforcement of the aluminum matrix composites using graphene were proposed.

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Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on the Properties of Aluminum Matrix Composites with Graphene

Бродова

Yolshina²,

Разоренов³

et al. 2022

Metals

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“…According to the results of theoretical studies [8][9][10][11], for particle sizes in the nanorange, diamond is a more stable form of carbon compared to graphite. According to [12], the boundaries of the stability regions for diamond and graphite are 10.2 nm at room temperature, 6.1 nm at 525 °C, 4.8 nm at 800 °C, and 4.3 nm at 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Obtaining nanocrystalline superhard materials from surface-modified nanodiamond powder

Vityaz

Senyut

Kheifetz

et al. 2022

JAMT

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During sintering of a nanodiamond powder with a coating based on non-diamond forms of carbon with a thickness of about 10 Å at relatively low pressures and temperatures, a nanostructured diamond material is formed by the transition of graphite-like carbon to diamond. It has been shown that nanodiamond powder modified with non-diamond forms of carbon is an "active" base on which a nanometer layer of graphite-like carbon transforms into diamond during thermobaric sintering. The influence of preliminary annealing of nanodiamonds in a disammonia atmosphere and in oxidizing and hydrocarbon-containing atmospheres on the structure and microhardness of nanodiamond polycrystals has been shown. It has been established that the atmosphere in which modifying annealing is carried out affects the content of the diamond phase and the size of nanodiamond crystallites in a polycrystalline material. The preliminary modification (functionalization) of the nanodiamond surface with carbon-containing compounds stimulates the process of diamond formation. In this case, the most significant increase in the microhardness of diamond polycrystals is observed after the modification of nanodiamonds in oxidizing and hydrocarbon atmospheres. It has also been established that the modifying treatment of nanodiamonds with hydrocarbons stimulates the processes of diamond synthesis, and an increase in pressure suppresses the graphitization of diamond and activates the transformation of graphite-like carbon into diamond, which contributes to sintering of diamond grains.

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Introduction

Simakov,

Scribano,

Melnik

et al. 2023

SpringerBriefs in Earth Sciences

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Diamond synthesis in aluminum matrix in molten alkali-halide at ambient pressure

Cited by 12 publications

References 33 publications

Effect of Grain Size on the Properties of Aluminum Matrix Composites with Graphene

Effect of Grain Size on the Properties of Aluminum Matrix Composites with Graphene

Obtaining nanocrystalline superhard materials from surface-modified nanodiamond powder

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