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[en] An original hot pressing method which may be applied to ceramics, metals, and refractory powders is described. The products obtained are fine grained polycristalline materials, with homogeneous structure, very high density, unstrained and of very large dimensions (several square meters). This process equally applies to composite materials including powders, fibers, etc..
[fr]Le procede original presente s'applique a la densification des poudres a faible plasticite ceramiques, metalliques ou refractaires par frittage a retrait accompagne en vue d'obtenir des materiaux polycristallins a grains fins, de structure homogene, de tres haute densite, sans contraintes, pouvant atteindre plusieurs metres carres. Procede egalement applicable a la mise en oeuvre de materiaux composites a partir de poudres, fibres, etc..
[en] Highlights: • The compaction behavior of CoCrFeMnNi high-entropy alloy powders of various sizes is studied. • The size and size-distribution of the powder particles are important factors in the tap density. • The strength of the matrix is the factor governing the final compact density. • The simulation densification behaviors are in good agreement with experimental ones.
[en] In this review the major Processes about manufacturing of metals with cellular structure are described - based on powder metallurgy, chemical deposition and some other methods (without melting techniques). It can be shown that during the last decade many interesting innovations led to new production methods to design cellular materials. Some of them are used nowadays in industry. Also characterization and properties become more important and have therefore been carried out carefully, because of their strong influence on the functions and applications of such materials. (author)