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Aluminum diboride synthesis from elemental powders by mechanical alloying and annealing
Aluminum diboride synthesis from elemental powders by mechanical alloying and annealing
- Source :
- Journal of the European Ceramic Society. 32:1457-1462
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- In this study, AlB 2 powders were synthesized by using a combined method of mechanical alloying (MA) and annealing of elemental aluminum (Al) and boron (B) powders. Milling was performed in a planetary ball-mill (Fritsch™ Pulverisette 7 Premium Line) up to 15 h under argon (Ar) atmosphere. Annealing process was carried out in a tube furnace at 650 °C for 6 h under Ar atmosphere. The effects of MA durations on the annealing process and AlB 2 formation were investigated. The conversion of Al and B powders to AlB 2 starts after only MA for 3 h or after MA for 1 h and subsequent annealing. A slight formation of AlB 12 occurs at 242 °C for as-blended powders and it shifts to about 272 °C for MA’d powders. Al–B powder blends MA’d for 9 h and annealed have AlB 2 particles in size between 35 and 75 nm in the presence of Al 13 Fe 4 , Fe 3 B and Fe 2 B contaminations.
Details
- ISSN :
- 09552219
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........1f504d608cf531ee3e889356af70555a
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2011.03.037