Process for the preparation of polycrystalline boron nitride

The invention relates to a process for the preparation of extremely hard composite materials, and especially to a process for the preparation of polycrystalline boron nitride. In this process, a reaction mixture is first prepared from boron nitride and high-melting materials such as for example tita...

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Main Authors 1I A KIYANSKY, A N DREMIN, B M SOKOLOVSKY, E S BOGORODSKY, O N BREUSOV, B N SURNIN, 1T V BAVINA, Y A SHIFRIN, S V PERSHIN, V N TROITSKY, 1V Y AVERIN, 1B M GREBTSOV, N S GORYACHEV
Format Patent
LanguageEnglish
Swedish
Published 05.04.1982
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS THEREOF
CONCRETE
INORGANIC CHEMISTRY
LIME, MAGNESIA
METALLURGY
NON-METALLIC ELEMENTS
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:The invention relates to a process for the preparation of extremely hard composite materials, and especially to a process for the preparation of polycrystalline boron nitride. In this process, a reaction mixture is first prepared from boron nitride and high-melting materials such as for example titanium nitride or titanium carbonitride, and this reaction mixture is subjected to high pressure and high temperature. The high-melting material must have a particle size of 50-1000 Angstroms. The invention can be used for making tools for the processing of alloys that are difficult to machine and work.
Bibliography:Application Number: SE19790006864