Results And Discussion

It is well known that the particle and agglomerate size and shape affects the sintered density of a fired ceramic material, and thus its mechanical integrity. In this work, the effect of milling and calcination temperature was examined. The fired-ceramics fabricated from un-milled powders contained particles that were angular in shape and produced sintered densities of less than 80% theoretical, while the fired-ceramics produced from milled samples (48 hr. using PSZ as a milling medium) were granular in shape and produced sintered densities greater than 95% depending upon the calcination temperature; as described by Reed [9], Table 1 shows the effect of calcination temperature on the fired density of the (CeO2)0.s(GdO j .5)0.2 sample after sintering milled powder at temperatures ranging from 1550 - 1650°C.

Table I. The effect of Sintering Temperature on the Percentage Theoretical Density of (Ce02)o.8(GdOi_5)o.2 as a function of Calcination Temperature.

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