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Vsesojuzny Nauchni-issledovatelsky Institut Abrazivov I Shlifovania

Leningradsky Politekhn Ichesky Institut Imeni Lensoveta

Vsesojuzny Nauchno-issledovatelsky Institut Abrazivov I Shlifovania

Viktor V Digonsky

Vladislav Sergeevich Lysanov

Alexei I Prikhna

Leon Izrailevich Feldgun

Alexandr A Shulzhenko

Vladimir I Unrod

Alexandr I Borimsky

Eduard Y Dovgal

Alexandr N Sokolov

Natalia G Kushkova

Vera I Denisova

Vitaly Y Egorov

Nikolai V Novikov

Sergei S Ordanian

Valerian D Yakimenko

Vladimir I Farafontov

Vyacheslav S Rovsha

Vadim A Blinkov

Marina P Chestnokova

Mirra I Sokhor

Ljubov A Pekelis

Sergei V Sinelnikov

Valery M Davidenko

Disclosed is a method of producing cubic boron nitride, which comprises the steps of subjecting to a pressure of from 40 to 70 kilobars and to a temperature of from 1100.degree. to 2000.degree. C. a charge including hexagonal boron nitride and a conversion initiator selected from the group consisting of alkali and alkaline earth metals and borides of the foregoing metals, doping the charge with crystallohydrate in the form of a compound selected from the group consisting of sulfur-, halogen- or nitrogen-containing salts and their mixtures incorporating at least 5 molecules of crystallization water. According to another embodiment, the aforesaid charge is doped with a member selected from the group consisting of alkali metal hydroxide or alkaline earth metal hydroxide.

Method of producing cubic boron nitride

A superhard composite material comprises cubic boron nitride and a binder nsisting of carbide and diboride of a metal selected from the group IV-V of the periodic system, taken in eutectic ratio, the components being contained therein in the following amounts, in percent by weight:

Superhard composite material

According to the invention, a method of preparing polycrystalline cubic bn nitride resides in that hexagonal boron nitride is subjected to the action of pressure of 40-90 kbar and temperature of 1200.degree.-2400.degree. C. in the presence of a catalyst, namely, a zinc compound. The proposed method makes it possible to increase considerably wear resistance of polycrystalline cubic boron nitride used in tools for working hardened steels and alloys.

Method of preparing polycrystalline cubic boron nitride

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Saint-Petersburg, Russia

Viktor V Digonsky