MOLTEN MIXTURE OF GRAINS OF ALUMINIUM OXIDE AND ZIRCONIUM OXIDE Russian patent published in 2015 - IPC C04B35/109 C09K3/14 

FIELD: agriculture.

SUBSTANCE: invention relates to the mixture of molten grains of aluminium and zirconium oxides, and may be used in the manufacture of abrasive tools. The declared mixture has the following chemical composition expressed in wt %: ZrO₂+HfO₂: 35-45.5; Al₂O₃: 43.7-65%; SiO₂<0.8%; other oxides <10%. Less than 5% of the grains have inclusions (accumulation of particles consisting of carbide or combination of carbides with the size larger than 10 microns). The concentration of inclusions, measured in cross section of any grain of the said mixture is more than 500 inclusions per square millimetre. The inclusions are the metal or combination of metals or metal carbides with the size less than 10 microns. The molten grains have the limited level of density without shrinkage depending on the particle size.

EFFECT: increase in service life of the abrasive grains.

15 cl, 10 dwg, 4 tbl