INVESTIGADORES
TOMBA MARTINEZ Analia Gladys
artículos
Título:
"Mechanical testing of cordierite porous ceramics using high temperature diametral compression"
Autor/es:
M.L. SANDOVAL; M. H. TALOU; A. G. TOMBA MARTINEZ; M. A. CAMERUCCI
Revista:
JOURNAL OF MATERIALS SCIENCE
Editorial:
SPRINGER
Referencias:
Año: 2010 vol. 45 p. 5109 - 5117
ISSN:
0022-2461
Resumen:
In this work, the high temperature mechanical behavior of cordierite porous disks
prepared by starch consolidation forming method was evaluated. In this method, based
on swelling and gelatinization properties of starch in aqueous suspension at
temperature, the starch granules perform as both consolidator/binder of the green body
and pore former at high temperature.
Aqueous suspensions of talc, kaolin and alumina (29.6 vol.%) with addition of potato or
cassava starches (11.7 vol.%) were prepared by intensive mechanical mixing,
homogenization and vacuum degasification. Green disks were formed by thermogelling
of the aqueous suspensions at 85¢XC for 4h and additional drying at 50¢XC for 24h. They
were characterized by bulk density and apparent porosity measurements, and
microstructural analysis by SEM/EDAX.
Porous cordierite materials were obtained by calcination at 650¢XC for 2h and reactionsintering
at 1330¢XC for 4h, employing specific controlled heating schedules in both
treatments. Cordierite disks were characterized by bulk density and apparent porosity
meaurements, and microstructural analysis by SEM.
Mechanical behavior was evaluated in diametral compression using a servohydraulic
testing machine at room temperature, 800, 1000 and 1100¢XC. Apparent stress-strain
relationships were obtained from load-displacement curves. Mechanical parameters
such as fracture strength (ãF), apparent Young modulus (Ea) and yield stress (ãY) were
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.
ãF), apparent Young modulus (Ea) and yield stress (ãY) were
determined by calculus. Moreover, cracks patterns were also evaluated. The obtained
results were analyzed in function of the developed microstructures, considering the
presence of a silicate glassy phase and a complex porosity, and the testing temperature.