METHOD OF PRODUCTION OF THE HARD-FACE SPHERICAL BODIES Russian patent published in 2018 - IPC C22C29/08 B22F1/02 B22F9/04 C22C1/04 

FIELD: technological processes.

SUBSTANCE: invention relates to the manufacture of carbide-tungsten spherical bodies with carbide coating. Method comprises mixing the VK8 carbide mixture with a plasticizer, its compressing, grinding of the compact, screening into fractions with sorting out of the pellets up to 400 mcm and of not less than 130 mcm, mixing of the separated granules with the finer dispersed powder of a inert non-sintering back-fill, annealing and isolation of the sintered granules by inert powder back-fill screening. Produced sintered pellets are loaded into the attritor together with a mixture of powders consisting of 97–99 % of niobium as a carbide-forming metal and 1–3 % of tin, and process in the inert gas environment with an intermediate removal of the contaminated powder, then annealed in a vacuum at a temperature of 850–950 °C for 2–4 hours to obtain carbide-coated hard-alloy beads.

EFFECT: providing an increase in the thickness of the coating, its adhesion strength and thermal protection properties.

1 cl, 1 tbl