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Institut Sverkhtverdykh Materialov Akademii Nauk Ukrainskoi Ssr

Institut Fizicheskoi Khimii Akademii Nauk

Institut Sverkhtverdykh Materialov Ssr

Jury I Nikitin

Valentin N Bakul

Alexei I Prikhna

Stanislav P Vnukov

Boris V Deryagin

Valentin P Varnin

Dmitry V Fedoseev

Valentin K Gerasimenko

Vladimir G Poltoratsky

Nekhemyan Veniaminovich Tsypin

Anatoly Vasilievich Hochko

Svetlana T Bura

A diamond paste to be used for treating surfaces of workpieces comprising diamond powder in a mechanical mixture with surface-active and lubricating (cooling) components. The components of the paste are used in the following quantities (in % by weight):

Diamond paste

The proposed polycrystalline superhard material comprises sintered particles of cubic boron nitride coated over the whole surface thereof with a layer of a crystalline compound of the chemical formula B.sub.x N.sub.y C.sub.z, where x, y and z can assume any value from 0 to 1, said compound binding together the particles of the cubic boron nitride. According to the present invention the proposed material is produced in the following way: particles of cubic boron nitride are placed in a flow of a gas containing carbon for a carbon layer 1-100 A thick to be built up on the whole surface of said particles. Then the particles of cubic boron nitride with the carbon layer built up over the whole surface of the particles are subjected to sintering at a temperature and under a pressure corresponding to the region of thermodynamic stability of cubic boron nitride. The herein-proposed material is highly uniform and features mechanical properties superior to those of the known cubic boron nitride materials. Thus, for example, under the identical conditions of cutting, durability of cutters made from the proposed material is 2-5 times higher than that of the cutters made from the known material based on cubic boron nitride.

Polycrystalline superhard material and method of producing thereof

A method of preparing a polycrystalline diamond member comprising sintering diamond particles having deposited thereon, not only diamond coating, but also diamond-graphite coating In the epitaxial method of coating according to the invention, diamond particles may be the finest ones of a size smaller than one micron. The resulting compact member is characterized in the absence of marked graphite inclusions, and diamond cleavage between the particles results in a considerable improvement of the strength of the compact member.

Polycrystalline diamond member and method of preparing same

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Kyiv, Ukraine

Jury I Nikitin