On the other hand, the chemical analyses carried out to both, the silico-aluminous refractory used as substrate and the electro-melted Al2O3 refractory used as reference are shown in Table1. The silico-aluminous refractory is constituted mainly by SiO2 and Al2O3, while in the electro-melted one the Al2O3 is the predominant oxide, which is combined with SiO2 and ZrO2. The surface analysis of the silico-aluminous refractory suggests irregular grains with low sintering degree and therefore, low density and high porosity, 2.16 to 2.26 g/cm3 and 16 to 20% respectively, (Fig. 1a, Table 1) typical of pressing and sintering processes of manufacturing. While the structure of the electro-melted Al2O3 refractory shows low porosity (< 2%) and therefore high density (3.4 g/cm3), (Fig. 1b, Table 1) characteristic of electro-melting processes of manufacturing
Table 1 Main physical-chemical features of the refractories used as substrate and as reference
Fig. 1. Surface structure of: a) Pressed & sintered silico-aluminous refractory used as substrate and b) electro-melted Al2O3 refractory used as reference.
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