Thick films of ceramic superconducting, electro-ceramic materials

Abstract

The use of thick films becomes more and more important in particular for electronic and microelectronic applications. The term “thick film ” does not relate so much to the thickness of the film but more to the kind of deposition. Thick films are made by low-priced processes such as doctor (dr) blading, screen-printing, or spraying methods, etc. The preparation of thick films of ceramic material by these methods generally implies a processing sequence of the following steps: preparation of the oxide powders; preparation of pastes and slurries; painting/printing, etc.of the pastes onto a suitable substrate; drying at low temperature; and sintering at high temperature to get a consolidated layer. These technologies and the fabricated thick films of thermoresistive and superconducting materials will be discussed.

Kinetics models describing degradation-relaxation effects in nanoinhomogeneous substances

“…The starting ceramics were synthesized by sintering route (1040 o C, 4 h duration) using reagent grade Cu carbonate hydroxide, and Ni, Co, Mn carbonate hydroxide hydrates [12][13][14]. The paste was prepared by mixing powder of basic Cu 0.1 Ni 0.1 Co 1.6 Mn 1.2 O 4 ceramics with МБ-60 glass, Bi 2 O 3 (used as inorganic binder) and some organic vehicle.…”

Preparation and characterisation of magnetically ordered columnar structures of barium ferrite particles

“…[7]. The structures obtained could be used as a basis for the preparation of multifunctional materials, where the voids between the columns could be filled with some other functional material, i.e.…”

“…Several techniques have been used to prepare such films, e.g. thermal spraying [7], electrophoretic deposition [8] and screen printing [9][10][11]. Recently, it was reported that materials with artificial structures show very interesting properties [12].…”

YBa2Cu3O7 melt textured thick films grown by infiltration process on YSZ substrate prepared by sol–gel method

“…The above facts indicate that relatively easy diffusion of cations through the whole film occurs during the infiltration and melt-texturation process. Since the 2 1 1 phase was present in over-stoichiometric amount, it was not completely consumed in reaction (3). It can be assumed that the Y 2 BaCuO 5 grains, which are probably precipitated in process of solidification are very fine.…”

“…for high power microwave resonators, superconducting fault limiters, magnetic shields, filters and antennas [1][2][3][4]. The thick film technologies allow the low cost production of large area coatings of complex shape with relative ease.…”