COMPOSITE NANOSTRUCTURED MATERIAL BASED ON cBN AND PREPARATION METHOD THEREOF Russian patent published in 2016 - IPC C04B35/5831 C04B35/645 B82Y40/00 

FIELD: ceramic industry.

SUBSTANCE: invention relates to engineering ceramics, particularly, to a wear resistant composite nanostructurized material based on cubic Boron Nitride (cBN) containing phase silicon nitride (Si₃N₄) and aluminium oxide (Al₂O₃) intended for use in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material. Disclosed is a wear-resistant composite nanostructurized material based on cubic boron nitride with matrix of Silicon (Si₃N₄) and aluminium oxide (Al₂O₃), containing component in the form of nano-sized phase of aluminium nitride (AIN), hardening matrix and the boundary between grains of boron nitride and matrix at volume ratio of components: cBN-49-52 %; matrix phase-42-45 %; nanosize phase AIN-4-6 %. Said material may have a coating composition Al_XTi_(1-X)N, where x = 0.55÷0.65 applied by physical vapour deposition. For creation of material with specified characteristics of the proposed method comprises mixing initial cubic Boron Nitride, aluminium oxide, Silicon nitride and sintering the obtained mixture under high pressure and high temperature (HPHT), wherein the process of sintering material is carried out at 1,450-1,550 °C and pressure in the range 3.5-3.9 GPa during 20 c. for production of microstructure consisting of a nanosized phase of aluminium nitride , sintering process is carried out in the presence of aluminium in gas phase.

EFFECT: is used in cutting tools used for treatment of hardened steel with hardness up to 65 HRC and iron, as well as a method of producing said material.

5 cl, 1 tbl, 2 dwg, 11 ex