INVESTIGADORES
CAMERUCCI Maria Andrea
congresos y reuniones científicas
Título:
THE USE OF STARCH FOR THE PREPARATION OF POROUS CORDIERITE CERAMICS BY SLIP CASTING PROCESSES
Autor/es:
WILLI PABST ; MARÍA LAURA SANDOVAL; EVA GREGOROVÁ; MARÍA ANDREA CAMERUCCI
Lugar:
Praga
Reunión:
Congreso; 8th International Conference on Polysaccharides-Glycoscience; 2012
Institución organizadora:
Asociación Química Checa
Resumen:
Native starch is a popular
pore-forming agent for the preparation of ceramics with controlled porosity and
pore size. In this contribution basic information is provided for the
preparation of porous cordierite ceramics via traditional slip casting with
starch and so-called starch consolidation casting. Results of a comparative
study are reported using different types of raw materials and different types
of native starches (potato, corn, tapioca). The chemical composition (measured
via X-ray fluorescence analysis) and particle size distribution (measured via
laser diffraction) of the raw materials and the rheological behavior of the
suspensions (measured via rotational viscometry) are compared. Values of bulk density
and estimated porosity are given as well as selected elastic properties (measured
via impulse excitation) of the porous ceramics made with native starch as a
processing auxiliary. Key points concerning chemical composition, particle
size, rheology and elastic constants are discussed. The apparent viscosity of
suspensions prepared in this work (with total solids volume fractions in the
range 2643 %) is below 200 mPas, which is at the lower limit of ceramics
suspensions for casting. For porous cordierite ceramics with a porosity of
4251 % the Youngs modulus is approx. 2339 GPa, the shear modulus approx.
916 GPa and the Poisson ratio approx. 0.257. The results indicate that the
porosity dependence of the Youngs modulus is reasonably well predicted by an
exponential relation, irrespective of the starch type used.