Low-Temperature Synthesis of α-Al₂O₃

Abstract

The paper considers the production of nanocrystalline α-Al₂O₃ powder at a temperature below 900 °C. It is shown that α-Al₂O₃ forms after high-temperature treatment of aluminum nitrate mixed with a mineralizer at 650 °С (holding time 6 h). The primary particles of α-Al₂O₃ are 25 to 30 nm in size and the specific surface area is 15.2 m²/g. The powder is used to produce self-reinforced composites in the ZrO₂–Y₂O₃–CeО₂–Al₂O₃ system.