Ceramic particulate material and processes for forming same

Details Ceramic particulate material and processes for forming same Ceramic particulate material and processes for forming same

C - Chemistry, Metallurgy

01

F

C01F 7/02 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2673769

Ceramic particulate material includes alumina particles, the particles having a specific surface area (SSA) not less than 15 m2/g and not greater than 75 m2/g and a sphericity quantified by at least one of (i) a means roundness not less than 0.710 as measured by Roundness Correlation Image Analysis, and (ii) a concavity less than 20%, wherein concavity is the percent of alumina particles based on a sample of at least 100 particles, which have a concve outer peripheral portion that extends along a distance not less than 10% of d50by TEM inspection, the concave outer peripheral portion having a negative radius of curvature as viewed from an interior of the particle.

Un matériau particulaire céramique comprend des particules d'alumine dont la superficie spécifique (SSA) n'est pas inférieure à 15 m2/g et pas supérieure à 75 m2/g et dont la sphéricité est quantifiée par (1) un arrondi moyen qui n'est pas inférieur à 0.71 tel que mesuré par analyse d'image de corrélation d'arrondi et/ou par une concavité inférieure à 20%, la concavité correspondant au pourcentage de particules d'alumine basé sur un échantillon d'au moins 100 particules, qui présentent une portion périphérique extérieure concave qui s'étend sur une distance qui n'est pas inférieure à 10% de d50 par inspection TEM, ladite portion périphérique extérieure concave ayant un rayon de courbure négatif lorsqu'il est visualisé depuis un endroit intérieur de la particule.

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