Processamento e caracterização de espumas vitrocerâmicas do sistema Li2O-ZrO2-SiO2-Al2O3 (LZSA) produzidas por gelcasting

• Autor(a) principal: Pozzobom, I. E. F
• Data de Publicação: 2014
• Outros Autores: Rodrigues-Neto, J.b., Raupp-Pereira, F., Donadel, K., Trichês, Eliandra de Sousa [UNIFESP], Oliveira, A.p.n
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1590/S1517-70762014000200006; http://repositorio.unifesp.br/handle/11600/8433
• topic: rheology; gelcasting; glass-ceramic foams; reologia; gelcasting; espumas vitrocerâmicas

In this work the viscosimetry technique was used to evaluate the rheological characteristics of ceramic suspensions prepared with a LZSA (Li2O-ZrO2-SiO2-Al2O3) glass. From the rheological characterization it was possible to establish optimized conditions of solid fraction, dispersant, organic monomers and foaming agent for the production of glass-ceramic foams by gelcasting. The resulting foams were subjected to heattreatments at 200-500ºC/60 min, for degradation of organics and at 950ºC/60 min for sintering and crystallization. With the obtained porous ceramic bodies linear thermal shrinkage, apparent density and mechanical strength measurements as well as microstructural analysis were performed. The adaptation of the rheological characteristics of the LZSA parent glass powder with the gelcasting processing technique allowed the production of ceramic foams with high open and interconnected porosity (>90%) with good thermal stability and with mechanical strength suitable for the production of porous ceramics.