TIAN Liang, LIANG Feng, ZHANG Jiefeng, WANG Junkai, TAN Cao, ZHANG Haijun , ZHANG Shaowei
(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China)

Abstract: AlN powders were synthesized by molten salt nitridation technique using LiCl-KCl as molten salt medium, aluminum powders and melamine as raw materials. Effects of reaction temperature and molten salt/reactant ratio on the phases and the morphology of the products were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that AlN powders with high purity and excellent crystallinity are obtained at the salt/reactant mass ratio of 4:1 after reacting at 1000°C for 3h. The as-prepared AlN is irregular granular, and its particle size is about 200-800 nm. Reaction temperature and molten salt/reactant ratio obviously affect the synthesis of AlN powders, the content of AlN in the product increases with reaction temperature and molten salt/reactant ratio increasing.

Key words: aluminum nitride; molten salt nitridation technique; reaction temperature