INVESTIGADORES
RENDTORFF BIRRER Nicolas Maximiliano
artículos
Título:
Plasma Dissociated Zircon (PDZ) processing; Influence of the Zr:Si Ratio in the composition, microstructure and thermal recrystallization
Autor/es:
N. RENDTORFF; G. SUAREZ; M.S. CONCONI; S.K. SINGH
Revista:
Procedia Materials Science
Editorial:
Elsevier
Referencias:
Año: 2012 vol. 1 p. 337 - 342
ISSN:
2211-8128
Resumen:
Plasma dissociated zircon (PDZ) has attractive applications in ceramic colouring, as well as the preparation of fine ZrO2
crystals, coatings and refractory materials. Generally the PDZ is obtained from different natural or synthetic zircon
powders, if the cooling rate is high enough a complete dissociation is achieved, with rounded (dendritic) zirconia grains
imbibed in a fused silica (non crystalline) matrix. The principal objective of this work is to establish the influence of the
incorporation of both products of the zircon dissociation (fused silica and crystalline zirconia) to the initial powders
mixture utilized for the processing of PDZ in an indigenous thermal plasma argon furnace. Both structural and
microstructural characterization was carried out. A thermal annealing at 1500ºC with different soaking time (1-15 hours)
was completed in order to establish the thermal stability to the thermodynamically favoured recombination, showing that
after this time a recombination was achieved, and this behaviour was not influenced by the Zr:Si ratio.
The addition of fused silica resulted in an important decrease of the zirconia grains size, while the zirconia addition had
the opposite result, showing that within this range (1-
with this processing variable. The present processing route showed an alternative way for obtaining different size of
monoclinic zirconia powder.