Two-stage plasma nitridation approach for rapidly synthesizing aluminum nitride powders

• Published in: Journal of materials research Vol. 32; no. 7; pp. 1279 - 1286
• Main Authors: Sung, Mei-Chen, Kuo, Yi-Ming, Hsieh, Lien-Te, Tsai, Cheng-Hsien
• Format: Journal Article
• Language: English
• Published: New York, USA Cambridge University Press 14.04.2017; Springer International Publishing; Springer Nature B.V
• Subjects: African American studies; Aluminum; Aluminum composites; Analysis; Applied and Technical Physics; Atoms & subatomic particles; Biomaterials; Chemical reactions; Chemical synthesis; Dielectric properties; High temperature; Inorganic Chemistry; Materials Engineering; Materials research; Materials Science; Nanotechnology; Nitrogen; Particle size; Plasma; Raw materials; Scanning electron microscopy; synthesis; discharge; aluminum nitride; nitridation
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/jmr.2016.505

The synthesis of aluminum nitride (AlN) powders from aluminum (Al) particles via a thermal nitridation process was carried out at high temperature (>900 °C) with a long reaction time (∼several hours). This study proposes a two-stage plasma-chemical synthesis process to efficiently minimize the agglomeration of Al particles, reduce the reaction time and temperature, and promote the formation of AlN powders. In the first stage, partially nitrided Al powders were produced at temperatures lower than 600 °C in atmospheric-pressure microwave N2 plasma. The particle size of the as-prepared powders was similar to that of the original Al powders. In the second stage, the reaction temperature was increased to 700–800 °C and the reaction time was less than 5 min in N2 plasma. Well-dispersed AlN powders with almost no agglomeration were produced. Moreover, the particle size was lower than that of the original Al.