CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
artículos
Título:
Effect of starch filler content and sintering temperature on the processing of porous 3y-zro2 ceramics
Autor/es:
L.B GARRIDO; M.P. ALBANO; K.P. PLUCKNETT; L. GENOVA
Revista:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Año: 2009 vol. 209 p. 590 - 598
ISSN:
0924-0136
Resumen:
A direct casting processwas used to produce porous 3YZrO2 ceramics using starch as a fugitive
filler and binder. The compositions with lowadditions of starch had higher porosity than
the volume fraction of starch initially in the green body (Xst), whereas, the compositions with
high amounts of starch produced lower porosity than the predicted value. The well ordered
structure consisted of spherical pores of 810_mdiameter, retained from the original starch
particles, connected by channels. The interconnection between poreswas dependent on the
volume fraction of starch incorporated, as well as on the sintering temperature. Pore interconnection
was observed for all the compositions sintered at 10001300 ◦C. Increasing the
sintering temperature to 14001500 ◦C produced a marked dependence of the open to total
porosity ratio on Xst. For a high porosity material, a bimodal channel size distribution was
found at 1400 and 1500 ◦C. The primary pore channel diameterwas 0.7_mand the secondary
onewas close to 4_m. As the sintering temperature increased, the volume of the connecting
channels decreased; at 1500 ◦C only a minor volume of the larger channels was found.