Nanocomposites and nanomaterials

Thin films for multilayer devices by tape casting method
Ivanchenko S.E., Umerova S.O., Baranovskyi D.I., Ragulya A.V.
Frantsevich Institute for Problems of Materials Science NASU 
Krzhizhanovsky str., 3, 03680, Ukraine, Kyiv-142 
E-mail: ise89@ukr.net, sergonische@gmail.com

Creation of thin BaTiO3 tapes always was a challenging goal because is the most efficient way to increase an MLCC capacity. The use of nanopowders as the basis for tapes is promising because it allows obtaining of films with low thickness and roughness close to the linear dimensions of one nanoparticle. It is a guarantee of improving the performance of multilayer devices without increasing their size, which is consistent with the tendency of miniaturization. Adaptation of high productive film formation method like tape casting to create layers of less than 1µm is a promising and challenging goal.
The BaTiO3 nanopowder was used to create tapes of dielectric layers and a mix of Ni/NiO powders was used for conductive layers. Tapes with the thickness from 5 µm to less than 1 µm were created by the tape casting method. The rheological behavior of all casting suspension was studied and casted tapes were characterized. Surface roughness comparable with the diameter of 1 particle was achieved. From obtained tapes, a few types of multi-layer composites with different layers thickness were assembled using isostatic lamination. Obtained multi-layer composites were successfully annealed and sintered without cracking or delamination.