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Vsesojuzny Nauchni-issledovatelsky Institut Abrazivov I Shlifovania

Leningradsky Politekhn Ichesky Institut Imeni Lensoveta

Vsesojuzny Nauchno-issledovatelsky Institut Abrazivov I Shlifovania

Vladislav Sergeevich Lysanov

Viktor V Digonsky

Leon Izrailevich Feldgun

Leonid Fedorovich Vereschagin

Alexei I Prikhna

Mark Simonovich Drui

Alexandr A Shulzhenko

Boris A Glagovsky

Jury Vladimirovich Naidich

Boris Dmitrievich Kostjuk

Alla Alexandrovna Lavrinovich

Alexandr Lazarevich Khait

Larisa Ruvimovna Frenkel

Nikolai Stepanovich Zjukin

Igor Borisovich Moskovenko

Galina Alexeevna Kolesnichenko

Vera I Denisova

Marina P Chestnokova

Ljubov A Pekelis

Valery M Davidenko

Ljudmila Yakovlevna Slavina

Nikolai V Novikov

Alexandr I Borimsky

Eduard Y Dovgal

Vladimir Ivanovich Farafontov

Alexandr N Sokolov

Vitaly Y Egorov

Vadim A Blinkov

Anatoly Samoilovich Kamenkovich

Galina Alexandrovna Shashkina

Veniamin Alexandrovich Yashin

Mark Efimovich Volpin

Sergei V Sinelnikov

Yaroslav Alexeevich Kalashnikov

Vladimir I Farafontov

Garri Shmilevich Roitshtein

Natalia G Kushkova

Valerian D Yakimenko

Vyacheslav S Rovsha

Yakov Abramovich Muzykant

Jury Nikolaevich Novikov

Mirra I Sokhor

Zinovy Illich Kremen

Sergei S Ordanian

Vladimir I Unrod

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

A process for producing synthetic diamonds which comprises the synthesis of diamonds from a charge consisting of graphite or a carbonaceous material capable of being graphitized and a catalyst; as the latter use is made of a metalgraphite laminar compound of a transition metal, wherein said metal is interposed between the graphite layers and chemically bonded therewith. Said catalyst makes it possible to shorten the duration of the synthesis down to several seconds and carry-out the synthesis at a temperature of below 1,200.degree. C. The resulting diamond crystals are colorless and transparent.

Process for producing synthetic diamonds

The herein-proposed alloy is characterized in that it contains apart from such known components as copper, tin, aluminium, cadmium, zinc, titanium, chromium, zirconium, manganese, molybdenum, tungsten, iron, cobalt and nickel also vanadium, niobium, tantalum and boron taken either separately or in combination, in an amount of 0.001 to 80 weight percent of the total weight of all the components thereof. The alloy is advantageous in possessing good technological characteristics, being resistant to oxidation at elevated temperatures, featuring good adhesion to all kinds of abrasive materials and giving strong brazing alloys and metallization coatings.

Alloy for metallization and brazing of abrasive materials

A method of testing wear-resistance of articles which comprises measuring the rate of propagation of ultrasonic oscillations in a reference article which has the lowest admissible wear resistance. The rate of propagation of ultrasonic oscillations in the articles being tested is compared with the rate in the reference article. The reference article is placed into a liquid in the suspended state and the articles being tested are placed into the same liquid. Those articles, which ascend to the surface, are rejected.

Method of testing wear resistance of articles on the basis of

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Saint-Petersburg, Russia

Vladislav Sergeevich Lysanov