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Fig. 4 | Bulletin of the National Research Centre

Fig. 4

From: Technological properties of high alumina refractories with different phosphoric acid contents

Fig. 4

The microstructure of the 3% phosphoric acid concentration batch fired at 1350 °C. a Bright interlocking prismatic mullite lathes condensed with each other; alumina and silica are the main oxides with minor amounts of iron and titanium oxide solid solution. b Cube-like corundum crystals composed mainly of Al2O3, with little amounts of silica, mainly due to the mullite corundum interferences. c Solid solution of mullite, phosphate phase and liquid phase of iron, titanium, and alkali oxides

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