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Structural, mechanical and dielectric properties of Ba0.6Sr0.4TiO3—The benefits...
Kaushal, A.; Olhero, S. M.; Antunes, P.; Ramalho, A.; Ferreira, J. M. F.This paper reports on the benefits gathered from a proper colloidal dispersion/deagglomeration of a Ba0.6Sr0.4TiO3 (BST) powder in water followed by spraying the aqueous suspension against liquid nitrogen to obtain homogeneous granules. The density of green compacts derived from the freeze granulated (FG) powder was compared with that of compacts prepared from the same starting BST powder but non-granulated (NG...
Vacuum infiltration of copper aluminate by liquid aluminium
Guedes, M.; Ferreira, J. M. F.; Rocha, L. A.; Ferro, A. C.This paper studies attained microstructures and reactive mechanisms involved in vacuum infiltration of copper aluminate preforms with liquid aluminium. At high temperatures, under vacuum, the inherent alumina film enveloping the metal is overcome, and aluminium is expected to reduce copper aluminate, rendering alumina and copper. Under this approach, copper aluminate toils as a controlled infiltration path for ...
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