Aa. Sharif et al., CONTROL OF GRAIN-GROWTH USING INTERGRANULAR SILICATE PHASES IN CUBIC YTTRIA-STABILIZED ZIRCONIA, Acta materialia, 46(11), 1998, pp. 3863-3872
Citations number
30
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Grain growth kinetics for 8 mol% yttria stabilized cubic zirconia (8Y-
CSZ) were investigated. Optimal process parameters required to achieve
a small grain size and full density for cubic 8Y-CSZ included a rapid
heating rate (100 degrees C/min) and hot isostatic pressing. Grain gr
owth rates could also be controlled by the deliberate addition of 1 wt
% of intergranular phases of borosilicate, barium silicate, and lithiu
m aluminum silicate glasses. Lithium aluminum silicate, the intergranu
lar phase with the highest solubility for yttria and zirconia, enhance
d grain growth compared to control samples without grain boundary phas
es. The borosilicate intergranular phase, with the lowest solubility f
or yttria and zirconia, was the most effective in suppressing grain gr
owth. Activation energies for grain growth were in the range of 400 kJ
/mol, and the grain growth exponent ranged from 2 for Lithium aluminum
silicate containing samples, to 3 for pure samples, to 4 for barium s
ilicate and borosilicate containing samples. (C) 1998 Acta Metallurgic
a Inc.