A NOVEL CHEMICAL ROUTE FOR PREPARATION OF NANOCRYSTALLINE α-Al₂O₃ POWDER

Abstract

A novel chemical method for preparing nanocrystalline α-Al₂O₃ powder has been developed in this study. The aluminum hydroxide precipitates were initially formed in a three-dimensional space network micro-area of the wet gel, and then the precursor was obtained after the wet gel was dried. The nanocrystalline α-Al₂O₃ powders were obtained after the precursor was calcined at 1100°C. The precursor and as-calcined powders were characterized using TGA-DTA, XRD, and TEM. The α-Al₂O₃ powders calcined at 1100°C for 2 h are of narrow distribution, little agglomeration, and small particle size of ∼51 nm. The reason for the synthesis of the high-quality powders is explained.

Keywords:

• α-Al₂O₃
• Little agglomeration
• Novel chemical method
• Nanocrystalline

Acknowledgments

Thanks are extended for the financial support from Liaoning Province Educational Department Foundation (No. 05L046) of China.