High-purity powder of hexagonal boron nitride and a method...

Details High-purity powder of hexagonal boron nitride and a method... High-purity powder of hexagonal boron nitride and a method...

C - Chemistry, Metallurgy

01

B

23/7

C01B 21/064 (2006.01) C01B 35/14 (2006.01) C04B 35/583 (2006.01)

Patent

CA 1260671

ABSTRACT OF THE DISCLOSURE The invention provides a method for the preparation of an upgraded high-purity powder of hexagonal boron nitride still having low crystallinity to retain activity for sintering. The first method comprises the steps of admixing a crude powder of hexagonal boron nitride with a carbonaceous material and heating the blend in a stream of an inert gas. The second method comprises the steps of admixing the powdery blend of boric acid or boron oxide as the boron source and a nitrogen compound as the nitrogen source with borax or anhydrous borax, heating the powdery blend to form a crude powder of hexagonal boron nitride, admixing the crude powder of hexagonal boron nitride with a carbonaceous powder, and heating the powdery blend at a temperature of 1300 °C or higher in a stream of an inert gas.

483069

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