Synthesis of AlN–SiC solid solution through nitriding combustion of Al–C–Si3N4 in air

✍ Scribed by L. Mei; J.-T. Li

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 738 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.03.031

✦ Synopsis

A simple way of fabricating AlN-SiC solid solutions (AlN-SiCss) through the combustion reaction of aluminum, carbon and Si 3 N 4 powder mixtures in air is reported. X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy are employed to analyze the phase composition and microstructure of the as-synthesized products. It is found that the phase composition of the product changes gradually with the increase in air infiltration distance, accompanied by variation in the partial pressure of N 2 /O 2 at different locations of the powder compacts. Homogeneous single-phase AlN-SiCss powders with well-crystallized hexagonal morphologies and a fine particle size of 3 lm can be obtained within a suitable distance range of N 2 infiltration. Thermodynamic analysis of the Al-C-Si 3 N 4 -air combustion reaction system was conducted based on the N 2 /O 2 diffusion kinetic model, and the calculated results are in good agreement with the experimental phenomenon.