关键词: 葡萄糖;AlN-Al2O3;复合粉末;碳热还原法;反应机理

Abstract: AlN-Al2O3 composite powders was synthesized by a carhothermal reduction method in N2 using C6H12O6·H2O and Al(OH)3 as raw materials.The effects of calcination temperatures on the phase composition and microstructure of AlN-Al2O3 composite powders were investigated, and the synthesis reaction mechanism of AlN-Al2O3 composite powders was also discussed.The synthesized powders were characterized by X-ray diffraction (XRD), laser particle size analyzer (LPSA) and scanning electron microscope (SEM).The experimental results show that the suitable conditions for the synthesis of AlN-Al2O3 composite powders is at 1500 ℃ for 2 h.The AlN-Al2O3 composite powders synthesized at 1500 ℃ mainly consists of a small amount of tabular grains and a large number of approximate spherical particles.Most of the particles with particle size between 100-500 nm are aggregated or stacked to form a large diameter of 0.5-1.5 μm particles.During the carbothermal reduction process, the Al2O3 produced by the decomposition of the Al(OH)3 raw material first produces the metal aluminum vapor and the Al2O gas oxide, and then further nitriding to form AlN.

Key words: glucose;AlN-Al2O3;composite powders;carbothermal reduction method;reaction mechanism