Abstract
Unfired Al2O3-C slides were prepared by using tabular corundum, reactive Al2O3 and fused alumina zirconia (FAZ) as main starting materials, Al powder and Si powder as anti-oxidation agents, phenolic resin as a binder. The effects of addition of fused alumina zirconia on the room temperature physical properties and hot modulus of rupture (HMOR) of unfired Al2O3-C slide were investigated. The phase composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results showed that with the increase of fused alumina zirconia content, bulk density of the specimens after dried increased, apparent porosity decreased and high temperature strength increased. Phase transformation in ZrO2 could take place at different temperature, accompanying a volumetric expansion and microcrack formation. This would lead to a first increase and then decrease in HMOR. A maximum value was reached at 11 wt. % ZrO2. The thickness of decarbonization increased with increasing ZrO2 content.
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