INVESTIGADORES
CAMERUCCI Maria andrea
congresos y reuniones científicas
Título:
orous alumina and mullite-based ceramics prepared with starch and wheat flour processing and characterization
Autor/es:
W. PABST, E. GREGOROVÁ, T. UHLÍřOVÁ, M. VESELÝ. M.A. CAMERUCCI, M.H. TALOU
Lugar:
Portland
Reunión:
Conferencia; 12th International Conference on Ceramic Processing Science; 2013
Resumen:
Porous oxide and
silicate ceramics, like alumina and mullite-based ceramics, are widely used as
furnace linings and kiln furniture. Apart from light weight and material
savings, the main advantage in these refractory applications is their low
thermal mass. This work is concerned with the preparation of porous alumina and
mullite-based ceramics using starch or wheat flour as pore formers, with the
objective to prepare porous refractories with porosities exceeding 45 %. Starch
consolidation casting (SCC) into metal molds is used for shaping, i.e. when
using starch it acts as a fugitive pore former and as a stiffening agent, while
in the case of wheat flour the SCC process is additionally accompanied by
foaming. Porosities of more than 45 % can easily be achieved with starch and
more than 60 % with wheat flour. A hierarchical microstructure with the largest
pores of order 100300 microns results in the case of processing with wheat
flour. The work includes rheological studies (rotational viscometry),
processing optimalization issues and microscopic investigation results
concerning dry-green and as-fired samples. Quantitative image analysis of the
pore space is performed using reliable microstructural descriptors such as the mean
intercept length (surface density) and the mean curvature integral as well as
Saltykov-transformed pore size distributions.