Aluminiumoxid für technische Anwendungen

A method for preparation of aluminiumhydroxid and alfa and gamma modifications of Al₂O₃ of high chemical purity and suitable physical properties is described. The gamma modification of Al₂O₃ was proved as a starting powder for the preparation of crystals of corundum, and the alfa modification of Al₂O₃ was tested as an effective polishing powder on crystals. With regard to the physical properties and the spherical form of the particles it seems that this aluminiumoxid is useful and perspective for other technical applications too.