METHOD OF PRODUCTION OF ULTRAHARD POLYCRYSTALLINE MATERIAL Russian patent published in 2008 - IPC C01B31/06 C04B35/52 C04B35/645 B24D3/34 B22F7/06 

FIELD: technological processes.

SUBSTANCE: invention may be used for production of parts and cutting tools for processing of wear resistant materials, in particular, silicon-containing aluminium alloys. Layers of diamond powder and material of impregnation that are in contact are placed layer by layer on charge. Layer of diamond powder is divided into two layers. In one of the layers, which contacts with impregnation material, diamond powder is used with size of particles from 20/14 to 2/1 mcm. Additionally detonating diamond powder is introduced with size of particles in the range from 1 to 100 nanometers in the amount from 1 to 30 percents from the volume of diamond powder of this layer. In the second layer, which contacts the first one, diamond powder is used with size of particles in the range from 40/28 to 28/20 mcm, at that height of this layer in respect to the first one amounts from 2:1 to 3:1. As impregnation material silicon or silicon-containing materials are used, for example, mixture of silicon powders, flaked graphite and detonating diamond. Stock prepared by this method is affected with high pressure - from 3 to 8 GPa and temperature of 1200 - 2000°C, for 40 - 120 sec. Prior to effect of high pressure and temperature stock may be shaped in round, square, rhombic, triangular, hexagonal and other forms. Ultrahard compact is prepared with high cutting ability and output of serviceable products.

EFFECT: permits to provide high purity of processed materials surface.

2 cl, 2 dwg, 1 tbl, 6 ex