Structural and morphological transformations in cobalt-carbon mixtures during ball milling, annealing and Spark Plasma Sintering

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Structural and morphological transformations in cobalt-carbon mixtures during ball milling, annealing and Spark Plasma Sintering. / Bokhonov, Boris B.; Korchagin, Michail A.; Ukhina, Arina V. et al.

In: Vacuum, Vol. 157, 01.11.2018, p. 210-215.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{cb72953f9e9349febb0dcad766003be0,

title = "Structural and morphological transformations in cobalt-carbon mixtures during ball milling, annealing and Spark Plasma Sintering",

abstract = "In this work, powder mixtures of cobalt and amorphous carbon of the Co-17 wt%C composition were processed by high-energy ball milling and annealing/Spark Plasma Sintering in vacuum to study the morphological transformations associated with graphitization of carbon in the powder and consolidated states of the material. High-energy ball milling led to the hcp-fcc transition in cobalt. During annealing of the milled powder, cobalt nanoparticles were encapsulated in graphitic shells. In the consolidated state, graphitization of carbon resulted in the formation of a 3D graphitized structure. Cobalt remained as the fcc phase in the annealed powders and sintered compacts due to the stabilizing action of graphitic shells and graphitic 3D walls, respectively. Selective dissolution of cobalt allowed obtaining porous graphitic materials composed of platelet-shape crystallites 20 nm thick. The specific surface area of the porous graphitized materials obtained from the compacts sintered at 800–1000 °C was of the order of 100 m2 g−1.",

keywords = "Carbon, Cobalt, Encapsulated nanoparticles, Graphitization, Spark plasma sintering, AMORPHOUS-CARBON, GRAPHENE, GRAPHITE, COMPOSITE, NANOPARTICLES, NANOCOMPOSITES, TEMPERATURE, NICKEL, NI, HYDROGEN STORAGE ABILITY",

author = "Bokhonov, {Boris B.} and Korchagin, {Michail A.} and Ukhina, {Arina V.} and Dudina, {Dina V.}",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = nov,

day = "1",

doi = "10.1016/j.vacuum.2018.08.052",

language = "English",

volume = "157",

pages = "210--215",

journal = "Vacuum",

issn = "0042-207X",

publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Structural and morphological transformations in cobalt-carbon mixtures during ball milling, annealing and Spark Plasma Sintering

AU - Bokhonov, Boris B.

AU - Korchagin, Michail A.

AU - Ukhina, Arina V.

AU - Dudina, Dina V.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - In this work, powder mixtures of cobalt and amorphous carbon of the Co-17 wt%C composition were processed by high-energy ball milling and annealing/Spark Plasma Sintering in vacuum to study the morphological transformations associated with graphitization of carbon in the powder and consolidated states of the material. High-energy ball milling led to the hcp-fcc transition in cobalt. During annealing of the milled powder, cobalt nanoparticles were encapsulated in graphitic shells. In the consolidated state, graphitization of carbon resulted in the formation of a 3D graphitized structure. Cobalt remained as the fcc phase in the annealed powders and sintered compacts due to the stabilizing action of graphitic shells and graphitic 3D walls, respectively. Selective dissolution of cobalt allowed obtaining porous graphitic materials composed of platelet-shape crystallites 20 nm thick. The specific surface area of the porous graphitized materials obtained from the compacts sintered at 800–1000 °C was of the order of 100 m2 g−1.

AB - In this work, powder mixtures of cobalt and amorphous carbon of the Co-17 wt%C composition were processed by high-energy ball milling and annealing/Spark Plasma Sintering in vacuum to study the morphological transformations associated with graphitization of carbon in the powder and consolidated states of the material. High-energy ball milling led to the hcp-fcc transition in cobalt. During annealing of the milled powder, cobalt nanoparticles were encapsulated in graphitic shells. In the consolidated state, graphitization of carbon resulted in the formation of a 3D graphitized structure. Cobalt remained as the fcc phase in the annealed powders and sintered compacts due to the stabilizing action of graphitic shells and graphitic 3D walls, respectively. Selective dissolution of cobalt allowed obtaining porous graphitic materials composed of platelet-shape crystallites 20 nm thick. The specific surface area of the porous graphitized materials obtained from the compacts sintered at 800–1000 °C was of the order of 100 m2 g−1.

KW - Carbon

KW - Cobalt

KW - Encapsulated nanoparticles

KW - Graphitization

KW - Spark plasma sintering

KW - AMORPHOUS-CARBON

KW - GRAPHENE

KW - GRAPHITE

KW - COMPOSITE

KW - NANOPARTICLES

KW - NANOCOMPOSITES

KW - TEMPERATURE

KW - NICKEL

KW - NI

KW - HYDROGEN STORAGE ABILITY

UR - http://www.scopus.com/inward/record.url?scp=85052491524&partnerID=8YFLogxK

U2 - 10.1016/j.vacuum.2018.08.052

DO - 10.1016/j.vacuum.2018.08.052

M3 - Article

AN - SCOPUS:85052491524

VL - 157

SP - 210

EP - 215

JO - Vacuum

JF - Vacuum

SN - 0042-207X

ER -

ID: 16245774