SUPERHARD MATERIAL Russian patent published in 2011 - IPC C04B35/528 C04B35/5835 

FIELD: chemistry.

SUBSTANCE: invention relates to production of superhard material which contains CVD diamond and which can be used in making a wheel dressing tool, a cutting, drilling tool etc. The surface of the CVD diamond is partially or completely covered by a shell under high pressure and temperature, where the said shell has a frame made from polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN) with a bond between diamond-diamond grains or cBN-cBN grains, between which an activating additive is placed. The surface area of the shell surrounding the CVD diamond is not less than 40% of the surface of the CVD diamond; said shell contains 70-95 wt % PCD or PCBN and 5-30 wt % activating additive. If the shell is made from polycrystalline material based on PCD, the activating additive contains silicon and/or at least one transition metal, and if made from polycrystalline material based on PCBN, the activating additive contains aluminium and/or nitrides, borides and/or salicides of group IlIa, IVa, IVb, Vb, VIb, VIIb and VIII metals. The CVD diamond component of the superhard material can be polycrystalline as well as monocrystalline and can have different shapes and dimensions.

EFFECT: obtaining superhard material with high compression strength and thermal stability.

4 cl, 5 tbl, 2 dwg