Composite. RU patent 2243955.

FIELD: ceramic composites for refractory parts, maintaining under extreme conditions.

SUBSTANCE: Claimed material is sintered under pressure and contains (mass %): hexagonal boron nitride 45-80 and second material 55-20. The second material represents solid aluminum oxide solution in silicium nitride containing 35 % or less of oxygen.

EFFECT: material with low thermal-expansion coefficient, improved rustproof quality and heat resistance.

6 cl, 2 tbl

IPC classes for russian patent Composite. RU patent 2243955. (RU 2243955):

C04B35/5835 -

C04B35/5833 -

Another patents in same IPC classes:

Composite / 2243955
Claimed material is sintered under pressure and contains (mass %): hexagonal boron nitride 45-80 and second material 55-20. The second material represents solid aluminum oxide solution in silicium nitride containing 35 % or less of oxygen.

Method of production of composite materials / 2266268
Proposed method includes molding the blanks from borazon powders followed by heat treatment of blanks in hydrocarbon medium and impregnation with liquid silicon at temperature of 1420-1700°C and pressure no less than 1000 mm Hg. Heat treatment in hydrocarbon medium is continued till increase of mass of blank by 3-25%. Borazon grains are bonded by silicon carbide matrix; proposed method excludes losses of superhard materials in forming silicon carbide due to diamond.

Structural material / 2348594
Structural material as per the invention is received from the charge material containing cilicide of carbon in the form of ultra fine fiber, ultra fine boron nitride and carbon fiber having periodically recurring internal volumes filled with helium at the following components ratio, volume %: boron nitride B11N15 30-94.6, carbon fiber 5-25, ultra fine cilicide of carbon 0.2-15, helium 0.2-30. Diamond - like layers are located in the contact spots of ultra fine fiber with carbon fiber, and cubic boron nitride layers are located in the contact spots with boron nitride. Helium and boron nitride have isotopic composition with light section of thermal neutron capture.

Superhard material / 2413699
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.