Advanced Cellular Ceramics by Direct Foaming Methods: Processing and Characterization

Reference Presenter Authors
17-037 Elisângela Guzi de Moraes Guzi de Moraes, E.(Universidade Federal de Santa Catarina); In this talk, an overview concerning the processing and characterization of cellular ceramics based on nitrides, carbides and borides will be presented. Cellular ceramics consist of several open cells arranged in honeycomb or foam-like structures, which have potential in structural applications due to their design and tailored porosity (> 70%), pore size distribution, pore connectivity, affording many advantages comparing to dense materials: unique permeability and efficient optimization of the elastic modulus-weight ratio. The control of processing conditions affect the properties of porous materials, thus expanding their use for different applications such filtration, thermal insulation, catalyst supports, adsorbers and sensors, porous burners, as well as biomedical applications. The development of silicon nitride ceramics with a cellular structure and interconnected porosity via direct foaming methods as intermediates in the production of highly porous materials will be considered. The successful combination of colloidal processing, foaming and gelcasting applied to produce cellular ceramics of Si3N4 was also extended to other advanced materials as for example max-phases belonging to Ti-Al-C system.
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