Preparation of aluminum nitride powders
1.1 Direct nitriding Aluminum nitride does not exist in nature. It is now prepared by direct nitriding of metallic aluminum powder or direct nitriding method after carbon thermal reduction of Al2O3. Its chemical reaction formula is: 2 al (s) + N2 (g) – > 2 aln (s) Direct nitriding has several advantages: 1) low cost; 2) Rich raw materials; 3) The reaction system is simple and there is no side reaction; 4) The reaction temperature is lower than that of carbothermic reduction; [...]