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Polycrystalline diamonds with the microstructure of the type of natural carbonado

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Polycrystals are aggregates of firmly spliced arbitrary oriented diamond crystallites of 0.1 to 20 mm in size (depending on the synthesis conditions) which are characterized by high wear-resistance and strength (~100 GPa).

Polycrystalline diamonds are formed under high pressures and temperatures as a result of the recrystallization of a graphite workpiece of a given shape. The process involves catalyst metal some amount of the inclusions of which are present in the aggregate.

Polycrystalline diamonds are used as cutting tools to machine aluminum high-silicon alloys and non-ferrous metals; as drawing and dressing tools; as burnishers, and indentors of active control.

Crushed polycrystals are used in drilling and stone-cutting tools successfully competing with natural diamonds.

Polycrystalline diamonds as a machine material can be used in plain bearings and high pressure devices.

The technology devised in the Institute for High Pressure Physics allows to synthesize polycrystalline diamonds of 0.5 to 1.0 carat in the form of a cylinder, octahedron, plate, cylinder with a hole, etc.

Contact person: Dr. Valentin Ryzhov. E-mail: ryzhov@hppi.troitsk.ru

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