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 -75 deg to 200 deg c. All three reaction systems resulted in the formation of precursor compounds, the carbothermic decomposition of which yielded ultrafine amorphous BN powders.
Author Keywords: elemento-organic; mineral processing; mechanical strength; resistance; synthesis
OP; Journal Article
Issue of Publication
Ceramic Engineering and Science Proceedings. Proceedings of the Conference on Raw Materials for Advanced and Engineered Ceramics
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