The material of chemical composition 1% Na2O, 28% Cr2O3, 28% Al2O3, 15% SiO2 and 28% ZrO2 was obtained by the gel route; this product is usually prepared by electrocasting and it is a well recognized refractory. The starting species dissolved in methanol/formic acid form the gel upon hydrolysis; this, on heating to 1500°C, forms a product of tetragonal and monocline ZrO2, ZrSiO4, Al2O3/Cr2O3 solid solution and vitreous phase. The evolution from gel to the final material was followed by X-ray analysis and DTA experiments: the separation and modification of the crystalline phases as a function of the temperature is demonstrated and discussed. Chemical analysis and scanning electron microscopy results allow a complete comparison to be made with the same composition obtained by electrocasting. © 1981.
AZCS refractories prepared from gels
GOTTARDI, VITTORIO;GUGLIELMI, MASSIMO;TIZIANI, ALBERTO;CARTURAN, GIANCARLO
1981
Abstract
The material of chemical composition 1% Na2O, 28% Cr2O3, 28% Al2O3, 15% SiO2 and 28% ZrO2 was obtained by the gel route; this product is usually prepared by electrocasting and it is a well recognized refractory. The starting species dissolved in methanol/formic acid form the gel upon hydrolysis; this, on heating to 1500°C, forms a product of tetragonal and monocline ZrO2, ZrSiO4, Al2O3/Cr2O3 solid solution and vitreous phase. The evolution from gel to the final material was followed by X-ray analysis and DTA experiments: the separation and modification of the crystalline phases as a function of the temperature is demonstrated and discussed. Chemical analysis and scanning electron microscopy results allow a complete comparison to be made with the same composition obtained by electrocasting. © 1981.
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