Morphology-controlled synthesis of α-alumina microplatelets through an additive-assisted molten salt reaction

摘要: Abstract Highly dispersed α-Al2O3 microplatelets of various sizes and aspect ratios were prepared by additive-assisted molten salt synthesis. The effects SiO2 SiO2 + CaO additions on phase formation morphology development particles investigated. Introducing additives are very effective in controlling morphology. additive significantly enhances shape anisotropy platelets, where a particle ratio ∼23.8 was achieved, about 2.7–6.0 times higher than those the platelets without additives. When using mixture, low concentration facilitates growth large (∼9.8 µm), while increasing its content dramatically reduces platelet size to ∼3.7 µm. These findings provide new insight for design synthesis novel advanced anisotropic microcrystals with improved quality.