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Re-sintered boron-rich polycrystalline cubic boron nitride and method for making same

Patent ·
OSTI ID:6298046
; ; ;
A method is described for making re-sintered polycrystalline cubic boron nitride (CBN) which comprises: (a) placing sintered substantially catalyst-free boron-rich polycrystalline cubic boron nitride particles in a high pressure/high temperature apparatus, the particles being substantially free of sintering inhibiting impurities; (b) subjecting the boron-rich cubic boron nitride particles to a pressure and a temperature adequate to re-sinter the particles, the temperature being below the CBN reconversion temperature; (c) maintaining the temperature and pressure for a time sufficient to re-sinter the boron-rich cubic boron nitride particles in the apparatus, and (d) recovering the re-sintered polycrystalline cubic boron nitride from the apparatus.
Assignee:
General Electric Co., Worthington, OH
Patent Number(s):
US 4673414
OSTI ID:
6298046
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BORON COMPOUNDS
BORON NITRIDES
CONTROL
CRYSTALS
FABRICATION
IMPURITIES
MATERIALS
NITRIDES
NITROGEN COMPOUNDS
PARTICLES
PARTICULATES
PNICTIDES
POLYCRYSTALS
PRESSURE CONTROL
SINTERED MATERIALS
SINTERING
TEMPERATURE CONTROL
TIME DEPENDENCE