Abstract
Aluminum nitride (AlN) ceramic is widely used in lots of fields, but its high-efficiency preparation still needs to be developed. In this paper, AlN nanoparticles are prepared from urea and aluminum chloride hydrate by a facile urea glass route in NH3 atmosphere. The products are characterized by X-ray powder diffraction, laser particle size analyzer, scanning electron microscope and transmission electron microscope. The results show that the urea content present less effects on the crystal phase of the AlN ceramic powder. Hexagonal aluminum nitride (h-AlN) nanoparticles with high purity can be obtained when the heat treatment temperature is above 900 °C. The crystallite size of AlN nanoparticles is enlarged with increasing temperature. The optimized molar ratio of urea to aluminum salt is 6 and the sintering temperature is 1000 °C. The average crystallite size of this product is 17.0 nm and the average particle size (D50) is 159.5 nm. The element distributions of N and Al in the AlN nanoparticles are highly coincident, which means that N and Al atoms in ceramic nanoparticles are well combined.
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