JP2531871B

PURPOSE:To enhance density and purity by blending hexagonal BN with B4C and B2O3 or H3BO3 in a specified weight ratio, molding the blend and sintering this molded body under ordinary pressure in an atmosphere of gaseous N2 or N-contg. nonoxidizing gas. CONSTITUTION:Cubic BN powder having 5-50m /g sp...

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Bibliographic Details
Main Authors NODA TAKAO, ICHIKAWA KAGETAKA, HATAKEYAMA FUMIO
Format Patent
LanguageEnglish
Published 04.09.1996
Edition6
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:PURPOSE:To enhance density and purity by blending hexagonal BN with B4C and B2O3 or H3BO3 in a specified weight ratio, molding the blend and sintering this molded body under ordinary pressure in an atmosphere of gaseous N2 or N-contg. nonoxidizing gas. CONSTITUTION:Cubic BN powder having 5-50m /g specific surface area is wet- mixed with 5-20wt.% B4C and 0.1-16wt.% B2O3 or 0.1-16wt.% (expressed in terms of B2O3) H3BO3 in an org. solvent such as acetone. The resulting slurry is dried with a drying means such as a spray drier, granulated and molded into a prescribed shape by rubber press molding or other method under ordinary or elevated pressure. This molded body is sintered at 1,000-2,200 deg.C under ordinary pressure in an atmosphere of gaseous N2 or N-contg. nonoxidizing gas to obtain a high density and high strength ordinary pressure sintered body of BN.
Bibliography:Application Number: JP19910174339