A SHS process has been established for synthesis of AIN powder under low nitrogen pressures. A1 and NaN3 powders were used as the metal and nitrogen sources, respectively. The compact of the mixture of the reactants was wrapped up with aluminum foil and then wrapped up with an igniting agent (i.e., Ti + C). The synthesis reaction was triggered by the combustion of the igniting agent. The wrappings were found necessary in achieving high product conversions under low nitrogen pressures (>1 MPa). The product conversion was also affected by the reactant composition and the nitrogen pressure. High conversions were obtained when the mass ratio of A1 to NaN3 was 1/2 or lower and the nitrogen pressure was 0.5 MPa or higher. The AIN powders as synthesized were observed to have two major types of morphology, i.e., granular particles with 0.5-3μm in diameter and fibers with aspect ratios of 10–800.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering