Effects of SnO2 Addition on the Synthesis of Magnesium Aluminate Spinel Microplatelets
AbstractIn order to prepare platelet-like spinel expected as the reinforcing phase, different amounts (5 – 20 at %) of SnO2 were added into the mixture of magnesia and alumina platelets, and then heated at 1300 – 1600 °C for 5 h. Effects of SnO2 addition on the synthesis of magnesium aluminate spinel microplatelets were investigated. The synthesized spinel was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. Spinel platelets like “sesame cookie” formed derived from platelet alumina based on the template process. The highest spinel content in samples with 10 % of SnO2 addition achieved. The amount of Al2O3 and SnO2 in solid solution and degree of orneriness for spinel depended on SnO2 addition.
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