Novel Synthesis of Mullite Powder with High Surface Area

Abstract

Boehmite (AlO(OH)) solid‐solution gel, which yields stoichiometric mullite (3Al2O32SiO2) at high temperatures, has been prepared by the hydrazine method. The formation process leading to 3Al2O32SiO2 is discussed. The as‐prepared powder and powders heated below 1200°C consist of very fine particles showing needlelike morphology, whereas the particles of mullite powder show thin prismatic morphology. The mullite powder after heating at 1300°C has a high surface area (87 m2/g).