FIELD: chemistry.
SUBSTANCE: agglomerate abrasive grain with open porosity from 5 to 40 vol% contains multitude of separate abrasive grains, selected from group, which consists of corundum, electrocorundum, sintered corundum, aluminium oxide, zircon, silicon carbide, boron carbide, cubic boron nitride, diamond and their mixtures, incorporated into binding agent matrix. Matrix of binding agent contains aluminosilicate and alkaline silicate, which have molar ratio Al2O3 to SiO2 from 1:2 to 1:20. Agglomerate abrasive grain additionally contains hollow bodies from 5 vol% to 40 vol%, which are incorporated in matrix of binding agent and which provide closed porosity to agglomerate abrasive grain. Sum of closed and open porosity constitutes less than 50 vol% of agglomerate abrasive grain. Method of obtaining agglomerate abrasive grain includes mixing abrasive grains and hollow particles with binding agent from alumosilicate, alkaline silicate and water, drying raw agglomerate abrasive grains at temperature from 80°C to 150°C, sorting to specified granularity of abrasive and solidification at temperature lower than 500°C.
EFFECT: increased wear resistance of abrasive grain.
13 cl, 1 dwg, 4 tbl, 22 ex
