Chapter 18. BN Powder Synthesis at Low Temperatures

  1. William Smothers
  1. Rustu S. Kalyoncu

Published Online: 28 MAR 2008

DOI: 10.1002/9780470320297.ch18

Proceedings of the Conference on Raw Materials for Advanced and Engineered Ceramics: Ceramic Engineering and Science Proceedings, Volume 6, Issue 9/10

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

Author Information

  1. Tuscaloosa Research Center, Bureau of Mines US Dept. of the Interior University, AL 35486

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1985

ISBN Information

Print ISBN: 9780470374368

Online ISBN: 9780470320297

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Keywords:

  • elemento-organic;
  • mineral processing;
  • mechanical strength;
  • resistance;
  • synthesis

Summary

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.