The sinterabilities of fine zirconia powders including 5 mass% Y 2 O 3 were investigated, with emphasis on the effect of Al 2 O 3 at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact including a small amount of Al 2 O 3 increased the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact including Al 2 O 3 was lower than that of a powder compact without Al 2 O 3 . The diffusion mechanisms at the initial sintering stage were determined using the new analytical equation applied for CRH techniques. This analysis exhibited that Al 2 O 3 included in a powder compact changed the diffusion mechanism from grain boundary to volume diffusions (VD). Therefore, it is concluded that the effect of Al 2 O 3 enhanced the densification rate because of decrease in the activation energy of VD at the initial sintering stage.
The sintering behavior of 7.8 mol! Yttria-stabilized cubic stabilized zirconia Y-CSZ powders was investigated, with emphasis on the effect of Al 2 O 3 addition at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating CRH . The powder compact with 0.25 mass! Al 2 O 3 enhanced the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact with Al 2 O 3 was lower than that of powder compact without Al 2 O 3 . The diffusion mechanisms at the initial sintering stage were determined by the new analytical method applied to the CRH data. This analysis exhibited that the diffusion mechanism changed from grain boundary to volume diffusions VD by Al 2 O 3 addition. It is therefore concluded that the Al 2 O 3 addition enhances the densification rate because of decreasing the activation energy of VD at the initial sintering stage.
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