Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102180
Title: Compaction and flow rule of oxide nanopowders
Authors: Boltachev, G. S.
Lukyashin, K. E.
Maximenko, A. L.
Maksimov, R. N.
Shitov, V. A.
Shtern, M. B.
Issue Date: 2017
Publisher: Elsevier B.V.
Citation: Compaction and flow rule of oxide nanopowders / G. S. Boltachev, K. E. Lukyashin, A. L. Maximenko, et al. — DOI 10.1016/j.optmat.2016.09.068 // Optical Materials. — 2017. — Vol. 71. — P. 145-150.
Abstract: Transparent Al2O3 ceramics have attracted considerable interest for use in a wide range of optical, electronic and structural applications. The fabrication of these ceramics using powder metallurgy processes requires the development of theoretical approaches to the compaction of nanopowders. In this work, we investigate the compaction processes of two model granular systems imitating Al2O3 nanosized powders. System I is a loosely aggregated powder, and system II is a powder strongly inclined to agglomeration (for instance, calcined powder). The processes of isostatical (uniform), biaxial, and uniaxial compaction as well as uniaxial compaction with simultaneous shear deformation are studied. The energy parameters of compaction such as the energy change of elastic interparticle interactions and dispersion interactions, dissipative energy losses related to the processes of interparticle friction, and the total work of compaction are calculated for all the processes. The nonapplicability of the associated flow rule to the description of deformation processes of oxide nanopowders is shown and an alternative plastic flow rule is suggested. A complete system of determining the relationship of the flow including analytical approximations of yield surfaces is obtained. © 2016 Elsevier B.V.
Keywords: COLD COMPACTION
FLOW RULE
OXIDE NANOPOWDER
YIELD SURFACE
ALUMINA
ALUMINUM OXIDE
ASSOCIATION REACTIONS
CERAMIC MATERIALS
ENERGY DISSIPATION
NANOSTRUCTURED MATERIALS
POWDER METALLURGY
STRUCTURAL CERAMICS
ANALYTICAL APPROXIMATION
COLD COMPACTION
FLOW RULES
INTER-PARTICLE INTERACTION
NANO POWDERS
POWDER METALLURGY PROCESS
STRUCTURAL APPLICATIONS
YIELD SURFACE
COMPACTION
URI: http://hdl.handle.net/10995/102180
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85000786930
PURE ID: 2042552
c66d3641-d047-4a17-8795-7b2aae558f24
ISSN: 9253467
DOI: 10.1016/j.optmat.2016.09.068
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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