Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation
We report the formation and phase separation response of nickel-graphite composites with variable-architecture phases by graphitization-accompanied consolidation via Spark Plasma Sintering and hot pressing. It was shown that the application of pressure during consolidation is crucial for th...
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| Format: | Article |
| Language: | English |
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International Institute for the Science of Sintering, Beograd
2015-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2015/0350-820X1503237D.pdf |
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| author | Dudina D.V. Ukhina A.V. Bokhonov B.B. Mali V.I. Anisimov A.G. Bulina N.V. Skovorodin I.N. |
| author_facet | Dudina D.V. Ukhina A.V. Bokhonov B.B. Mali V.I. Anisimov A.G. Bulina N.V. Skovorodin I.N. |
| author_sort | Dudina D.V. |
| collection | DOAJ |
| description | We report the formation and phase separation response of nickel-graphite
composites with variable-architecture phases by graphitization-accompanied
consolidation via Spark Plasma Sintering and hot pressing. It was shown that
the application of pressure during consolidation is crucial for the
occurrence of graphitization and formation of 3D graphite structures. We
evaluated the suitability of the synthesized composites as precursors for
making porous structures. Nickel behaved as a space holder with the particle
size and spatial distribution changing during consolidation with the
temperature and determining the structure of porous graphite formed by phase
separation by dissolution in HCl. The response of the consolidated Ni-Cgr to
separation of carbon by its burnout in air was studied. The result of the
carbon removal was either the formation of a dense and continuous NiO film on
the surface of the compacts or oxidation through the compact thickness. The
choice between these two options depended on the density of the compacts and
on the presence of carbon dissolved in nickel. It was found that during the
burnout of graphite from Ni-Cgr composites, sintering, rather than formation
of pores, dominated. |
| first_indexed | 2024-12-11T07:46:50Z |
| format | Article |
| id | doaj.art-1b762ca4a22644dd9146ada14f422262 |
| institution | Directory Open Access Journal |
| issn | 0350-820X 1820-7413 |
| language | English |
| last_indexed | 2024-12-11T07:46:50Z |
| publishDate | 2015-01-01 |
| publisher | International Institute for the Science of Sintering, Beograd |
| record_format | Article |
| series | Science of Sintering |
| spelling | doaj.art-1b762ca4a22644dd9146ada14f4222622022-12-22T01:15:27ZengInternational Institute for the Science of Sintering, BeogradScience of Sintering0350-820X1820-74132015-01-0147323724810.2298/SOS1503237D0350-820X1503237DNickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separationDudina D.V.0Ukhina A.V.1Bokhonov B.B.2Mali V.I.3Anisimov A.G.4Bulina N.V.5Skovorodin I.N.6Institute of Solid State Chemistry and Mechanochemistry SB RAS, Novosibirsk, Russia + Novosibirsk State University, Novosibirsk, RussiaInstitute of Solid State Chemistry and Mechanochemistry SB RAS, Novosibirsk, RussiaInstitute of Solid State Chemistry and Mechanochemistry SB RAS, Novosibirsk, Russia + Novosibirsk State University, Novosibirsk, RussiaLavrentiev Institute of Hydrodynamics SB RAS, Novosibirsk, RussiaLavrentiev Institute of Hydrodynamics SB RAS, Novosibirsk, RussiaInstitute of Solid State Chemistry and Mechanochemistry SB RAS, Novosibirsk, RussiaInstitute of Automation and Electrometry SB RAS, Novosibirsk, RussiaWe report the formation and phase separation response of nickel-graphite composites with variable-architecture phases by graphitization-accompanied consolidation via Spark Plasma Sintering and hot pressing. It was shown that the application of pressure during consolidation is crucial for the occurrence of graphitization and formation of 3D graphite structures. We evaluated the suitability of the synthesized composites as precursors for making porous structures. Nickel behaved as a space holder with the particle size and spatial distribution changing during consolidation with the temperature and determining the structure of porous graphite formed by phase separation by dissolution in HCl. The response of the consolidated Ni-Cgr to separation of carbon by its burnout in air was studied. The result of the carbon removal was either the formation of a dense and continuous NiO film on the surface of the compacts or oxidation through the compact thickness. The choice between these two options depended on the density of the compacts and on the presence of carbon dissolved in nickel. It was found that during the burnout of graphite from Ni-Cgr composites, sintering, rather than formation of pores, dominated.http://www.doiserbia.nb.rs/img/doi/0350-820X/2015/0350-820X1503237D.pdfspark plasma sinteringhot pressingnickelgraphitizationphase separationmicrostructureelectron microscopy |
| spellingShingle | Dudina D.V. Ukhina A.V. Bokhonov B.B. Mali V.I. Anisimov A.G. Bulina N.V. Skovorodin I.N. Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation Science of Sintering spark plasma sintering hot pressing nickel graphitization phase separation microstructure electron microscopy |
| title | Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation |
| title_full | Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation |
| title_fullStr | Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation |
| title_full_unstemmed | Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation |
| title_short | Nickel-graphite composites of variable architecture by graphitization-accompanied spark plasma sintering and hot pressing and their response to phase separation |
| title_sort | nickel graphite composites of variable architecture by graphitization accompanied spark plasma sintering and hot pressing and their response to phase separation |
| topic | spark plasma sintering hot pressing nickel graphitization phase separation microstructure electron microscopy |
| url | http://www.doiserbia.nb.rs/img/doi/0350-820X/2015/0350-820X1503237D.pdf |
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