FIELD: chemistry.
SUBSTANCE: invention relates to polycrystalline diamond for use in a variety of instruments. Polycrystalline diamond is characterized in that it comprises a sintered diamond grains having an average grain diameter of more than 50 nm and less than 2500 nm, the purity of 99 % or more and the grain diameter of D90, is (average grain diameter + average grain diameter of × 0.9) or less, wherein the polycrystalline diamond has a lamellar structure and has a hardness of 100 GPa or more.
EFFECT: water jet nozzle cutter for engraving gravure scriber, cutting tool and scribing clip from such material ensures stable processing over a long period of time as compared with conventional tools comprising monocrystalline diamond and the sintered diamond compact containing metal binders.
13 cl, 5 tbl, 62 ex
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