Ceramic Shell Foams Produced by Direct Foaming and Gelcasting of Proteins: Microstructural and Fluid dynamic Characterization

Reference	Presenter	Authors (Institution)	Abstract
17-026	Naiane Paiva Stochero	Stochero, N.P.(Universidade Federal de Santa Catarina); de Moraes, E.G.(Universidade Federal de Santa Catarina); Novaes de Oliveira, A.P.(Universidade Federal de Santa Catarina); Moreira, A.C.(Universidade Federal de Santa Catarina); Fernandes, C.P.(Universidade Federal de Santa Catarina); Innocentini, M.D.(Universidade de Ribeirão Preto);	This paper presents a work concerning to of microstructural and fluid dynamic properties of ceramic shell foams produced by direct foaming and gelcasting of protein. The ceramic shell waste generated in the process of precision casting by lost-wax possess is very interesting and shows suitable characteristics and properties for the manufacturing of cellular materials specially in applications involving high temperatures (> 1400 °C). Thus, ceramic shell wet foams containing 35 vol.% of solids stirred at 500 rpm were prepared and consolidated by gelification of proteins at 80 °C for 2 h and 30 min. Subsequently, the ceramic shell foams were fired at 1550 °C (2 °C / min, 2 h), and characterized according to permeability and microtomography tests. Permeability constants calculated from Ergun’s equation were related to their apparent porosity and pore size. X-ray computer tomography (XCT) analysis were used to characterize the microstructure of the fired ceramic shell foams. The results showed that it is possible to obtain cellular materials, consisting predominantly of mullite-zirconite, with porosities of up to 87%, pore size between 100 $\mu$m and 900 $\mathrm{\mu }$m and permeability values in the range of magnitude typical for bodies produced by gelcasting of foams.
<< Back