Fabrication of Nd:Y2O3 transparent ceramics by pulsed compaction and sintering of weakly agglomerated nanopowders

Simulation of the macromechanical behavior of oxide nanopowders during compaction processes

“…At present time high hopes concerning the development of promising structural and functional materials are pinned on the production and the investigation of nanostructured ceramics based on different oxides, for example, Al 2 O 3 , ZrO 2 , Y 2 O 3 , YSZ, and so on [1,2,3,4,5]. The powder metallurgy methods, which include such stages as the nanopowder production, compaction, and sintering, are the most debugged and fruitful methods for manufacture of the nanosized ceramic materials [2,3,4,5,6,7].…”

“…The powder metallurgy methods, which include such stages as the nanopowder production, compaction, and sintering, are the most debugged and fruitful methods for manufacture of the nanosized ceramic materials [2,3,4,5,6,7]. The nanostructure preservation during the sintering stage needs the use of reduced temperatures that makes great demands of compacts prepared in previous stage [2,3,4,5].…”

“…Such high pressures are achieved, for example, in the processes of magnetic pulsed compaction owing to the application of inertial effects [7]. In spite of the considerable experimental progress in this line [2,3,4,5], it can be claimed that the further progress is impeded by the lack of theoretical description of nanosized powders.…”

“…Such high pressures are achieved, for example, in the processes of magnetic pulsed compaction owing to the application of inertial effects [7]. In spite of the considerable experimental progress in this line [2,3,4,5], it can be claimed that the further progress is impeded by the lack of theoretical description of nanosized powders.As a rule, present-day theoretical approaches to nanopowder description are the application of principles, which have developed for larger particle powders and do not take into account the peculiarities of new subjects of inquiry. So, for example, the theory of the plastically hardening porous body [6,7,17] and the related models of sintering and hot-pressing [18,19] appear to be the powerful tools for the theoretical analysis.…”

Fabrication of transparent ceramics by millimeter‐wave sintering

“…Green samples of different compositions were prepared by three collaborating groups using different methods. 1.0 and 3.3 mol.% Nd:Y 2 O 3 samples were fabricated by magnetic pulse compaction of nanosized powder obtained by target evaporation with a pulse-periodic CO 2 laser at the Institute of Electrophysics (IEP), Russia [16]. The samples of 1.0, 5.0, and 9.8 at.% Yb:YAG compositions were prepared from commercial powders, 3N-4N in purity, at the Institute of Science and Technology for Ceramics (ISTEC CNR), Italy, following the procedure described in detail elsewhere [17][18][19].…”