FIELD: chemistry.
SUBSTANCE: ceramic powdered material contains aluminium oxide particles. Said particles have specific surface area (SSA) not less than 15 m2/g and not greater than 75 m2/g and sphericity quantified by at least one of (i) a mean roundness not less than 0.710 as measured by roundness correlation image analysis, and (ii) a concavity less than 20%. Concavity is the percentage of aluminium oxide particles based on a sample of at least 100 particles, which have a concave outer peripheral portion that extends along a distance not less than 10% of d50 by TEM inspection, the concave outer peripheral portion having a negative radius of curvature as viewed from the interior of the particle. The aluminium oxide particles are obtained by heat treatment, involving hot isostatic pressing (HIPing) of loose powder at pressure approximately not less than 0.1 ksi at temperature not lower than 300°C.
EFFECT: production of ceramic powdered material containing aluminium oxide particles for use as abrasive and filler with the required density with limited thermal balance, maximum sintering temperature and curing time.
16 cl, 25 dwg, 3 tbl, 5 ex
