Chapter 18. BN Powder Synthesis at Low Temperatures
- William Smothers
Published Online: 28 MAR 2008
Copyright © 1985 The American Ceramics Society, Inc.
Proceedings of the Conference on Raw Materials for Advanced and Engineered Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 9/10
How to Cite
Kalyoncu, R. S. (1985) BN Powder Synthesis at Low Temperatures, in Proceedings of the Conference on Raw Materials for Advanced and Engineered Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 9/10 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320297.ch18
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1985
Print ISBN: 9780470374368
Online ISBN: 9780470320297
- mineral processing;
- mechanical strength;
The Bureau of Mines has devised a laboratory technique for preparing ultrafine boron nitride (BN) powders through the formation of elemento-organic BN precursor compounds at low temperatures. Structural materials produced from such highly reactive powders may have applications in the severe conditions of temperature, pressure, and environment encountered in mining and mineral processing. The reactions of sodium borohydride (NaBH4) with ammonium chloride (NH4Cl) in an organic solvent such as chlorobenzene, ammonia (NH3) with boron trichloride (BCl3), and NH4Cl with BCl3 were studied at temperatures ranging from −75o to 200o C. AH three reaction systems resulted in the formation of precursor compounds, the carbothermic decomposition of which yielded ultrafine amorphous BN powders.