Synthesis of nearly spherical AlN particles by an in-situ nitriding combustion route

Abstract Spherical AlN powders with micrometer size have attracted great attention owing to their good fluidity and dispersity. However, the industrial preparation methods usually require high temperature long soaking time, which lead cost limit wide application of products. Herein, nearly spherical particles average 2.5 µm were successfully synthesized via an in-situ combustion synthesis method. The effect N 2 pressure, NH 4 Cl content, Al particle on reaction procedure, phase composition, microstructure products was systematically investigated. results showed that decreased increased led decreasing speed, further affected morphology As a result, low pressure (0.2 MPa), small amount (0.5 wt%), fine (?2.5 µm) contributed moderate facilitated formation particles. In addition, based gas-releasing assisted quenching experiments thermo-kinetic analysis, two-step growth mechanism for rationally proposed. present method shows advantages efficiency preparing particles, can be used as raw materials electronic substrates fillers packaging materials.