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Institut Fiziki Vysokikh Daleny Akademi Nauk, Sssr

Alexandr Yakovlevich Preobrazhensky

Leonid Fedorovich Vereschagin

Vasily Alexandrovich Stepanov

Evgeny Nikolaevich Yakovlev

Vladislav Nikolaevich Slesarev

Ljudmila Efimovna Shterenberg

Tatyana Dmitrievna Varfolomeeva

Tatyana D Varfolomeeva

Valentin Semenovich Voblikov

A material consisting of grains varying in size from 0.1 to a few microns intergrown so as to form regular aggregates. The geometric shape of the material is preset by a pattern made from a carbon-bearing non-diamond material and corresponds to the shape of the required finished article. The material can be made in any desired number of identical shapes.

Microcrystalline monolithic carbon material

A method of producing polycrystalline diamond aggregates, wherein a carbon-containing material is given a required shape, after which, in the presence of a catalyst taken in the form of a powder whose envelope surrounds the carbon-containing material, said material is subjected to the action of pressure and simultaneous heating by an electric current pulse with a duration of 0.1 to 10.0 sec.

Method of producing polycrystalline diamond aggregates

A method of producing polycrystalline diamonds which is characterized by providing a thermal contact of the reaction chamber with the cooled members of the device developing a high pressure and high temperatures for removing the heat generated within this chamber in the process of crystallization of a diamond, which method is also characterized in that the cross-sectional area of the metal-catalyst is not more than 0.04 that of the reaction chamber in a plane normal to the direction of the maximum withdrawal of the heat of crystallization. Said metal-catalyst is set in the carbon-containing material substantially in the center of the reaction chamber.

Method of producing polycrystalline diamonds

A workpiece made of a non-diamond carbonaceous material and having dimensions exceeding those of a polycrystalline diamond aggregate by a contraction coefficient value of the non-diamond material during its transformation into a polycrystalline diamond material, is enclosed with a powder-like catalyst having particle dimensions less than the minimum dimensions of the workpiece, subjected to a pressure of at least 80 kb, and heated by a pulse of electric current for a period of 0.1 to 10 seconds sufficient for the formation of said polycrystalline aggregate.

Growing community of inventors

Moscow, Russia

Alexandr Yakovlevich Preobrazhensky