Abstract
MgO particles were coated with a chelate compound of aluminum and heated in air to prepare Al2O3-coated MgO particles for modifying surface properties. The dissolution of MgO in water was suppressed by the Al2O3 coating. The amount of dissolved Mg ion was minimum after heating at 500°C. The Al2O3-MgO layer 10-30nm thick was observed on the surface of the MgO particles heated at 500°C. Fine particles 10nm in diameter were seen in the coating layer and they aggregated into clusters 300-500nm in diameter after heating at 1000°C. It was also found that the adherence of coating layer to MgO particles decreased after heating at 1000°C compared with those heated at 500°C.
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