METHOD OF PRODUCING COMPOSITE DIAMOND-CONTAINING MATRIX WITH INCREASED DIAMOND HOLDING BASED ON HARD-ALLOY POWDER MIXES Russian patent published in 2017 - IPC B22F3/16 B22F3/26 B24D3/06 C22C26/00 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of diamond tools based on hard-alloy powder mixes. Method of producing a diamond-containing matrix of a diamond tool involves preparation of a hard alloy powder mix, its plastification, in-layer filling the prepared charge and placing diamond grains with a shell of chromium particles into a metal mold, molding the charge with diamond grains into a briquette and sintering the briquette in the furnace with a low-melting metal or alloy in the direction from the bottom to the top. Diamond grains are used with the shell of a uniform layer of chrome particles with the thickness of not less than 5 % from the minimum linear size of diamond grains produced by fixing a plasticized powder of chrome on the surface of diamond grains with subsequent drying. Sintering the briquette in the furnace is performed by heating first for 60–90 minutes up to the temperature of 600 °C, then for 60–70 minutes up to the temperature of 860–1,000 °C, after that up to the temperature of 1,100 °C with provision of thermodiffusion metal coating of the diamond grains with chromium.

EFFECT: provided is reduced consumption of diamonds due to increased strength and reliability of diamond grains fixing in the tool matrix, as well as higher resistance of the diamond tool.

3 cl, 1 dwg