UA86331C2 - Method for production of articles of composition material based on diamond - Google Patents

Abstract

A method for production of articles of composition material based on diamond, which comprises the obtaining of profile infiltration-formation moldings, which internal surface has form of hemisphere, from mix, which contains even silicon in quantity sufficient for infiltration of diamond weight, graphite and addition refractory component, which in turn contains metals and/or their alloys, and/or compounds, which have melting temperature above melting temperature of silicon, and is produced additional molding, at that before heating in heater of cell of high pressure both said moldings for formation of sphere are connected.

Description

connected to form a sphere and placed in a high-pressure cell.

Sintering was carried out in a toroid-type high-pressure apparatus for 90 seconds at a pressure of 8 GPa and a temperature of 1400". After sintering, the sintered products were chemically treated to clean their surface from graphite residues. Upon visual inspection, the obtained spherical profile surface of the product has the correct shape, on which there was no due to the fact that the modulus of volumetric compression of the refractory component introduced into the mixture is much greater than the modulus of volumetric compression of graphite, we can obtain a product in the form of balls with slight deviations from the spherical shape.

Example 2

For the manufacture of products from a composite material based on diamond, a mixture was prepared for the formation of impregnation-forming molding, which contains 5 mass. 90 of a refractory component, namely boron carbide B4C with a particle size of 40 μm; 14 by mass of flaky graphite, 15 by mass of silicon and 95 by mass of diamond nanopowder with a particle size of 0.002-0.01 microns. This mixture was poured into a ball mill and mixed for 30 minutes. A hemispherical impregnation molding was pressed from the resulting mixture in a mold, then a mixture was prepared to obtain an additional molding, which contains 5% by weight of a refractory component, namely boron carbide VAS with a particle size of 40 μm and 35% by mass of flaky graphite. The mixture was poured into a ball mill and mixed for 30 minutes. After that, an additional molding in the form of a hemisphere was pressed from the resulting mixture in a mold. Diamond mass was poured onto profile surfaces in the form of hemispheres formed by impregnation-forming molding and additional molding, pressed with a punch. Thus, the formed hemispheres with diamond mass were connected to form a sphere and placed in a high-pressure cell.

Sintering was carried out in a toroid-type high-pressure apparatus for 90 seconds at a pressure of 8 GPa and a temperature of 1400 °C. After sintering, the sintered products were chemically treated to clean their surface from graphite residues. Upon visual inspection, the obtained spherical profile surface of the product has the correct shape, on which no surface defects were detected.

Example C

For the manufacture of products from a composite material based on diamond, a mixture was prepared for the formation of impregnation-forming molding, which contains 5Omas.95 of a refractory component, namely molybdenum Mo with a particle size of 40 μm; 20 wt.9o of flake graphite, 20 wt.bo of silicon and 10 wt.9o of diamond nanopowder with a particle size of 0.002-0.01μm. This mixture was poured into a ball mill and mixed for 30 minutes. From the obtained mixture, a semisphere-shaped impregnating molding was pressed from the resulting mixture, then a mixture was prepared to obtain an additional molding, which contains 5Omas.9o of a refractory component, namely molybdenum Mo with with particle sizes of 40 μm and 50 wt. 90 scaly graphite. The mixture was poured into a ball mill and mixed for 30 minutes. After that, an additional molding in the form of a hemisphere was pressed from the resulting mixture in a mold. Diamond mass was poured onto profile surfaces in the form of hemispheres formed by impregnation-forming molding and additional molding, pressed with a punch. Thus, the formed hemispheres with diamond mass were connected to form a sphere and placed in a high-pressure cell.

Sintering was carried out in a toroid-type high-pressure apparatus for 90 seconds at a pressure of 8 GPa and a temperature of 1400 °C. After sintering, the sintered products were chemically treated to clean their surface from graphite residues. Upon visual inspection, the obtained spherical profile surface of the product has the correct shape, on which no surface defects were detected.