Modified sol-gel alumina

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 3/14 (2006.01) C04B 35/111 (2006.01) C04B 35/624 (2006.01)

Patent

CA 2203552

Alpha alumina abrasive grits with grain boundaries modified with at least one of yttria and a rare earth metal oxide, and one or more oxides selected from the oxides of magnesium and/or transition elements, perform at enhanced levels if at least the yttria and/or rare earth metal oxide modifiers are present within the body of the grit in concentrations at least as high as their concentrations at the surface of the grit.

L'invention porte sur des grains abrasifs d'alumine alpha dont les joints de grains ont été modifiés avec au moins une substance de l'ensemble constitué par l'oxyde d'yttrium et celui d'une terre rare ainsi qu'un ou plusieurs oxydes, sélectionnés parmi les oxydes de magnésium et/ou d'éléments de transition. Ces grains accusent des performances à des degrés élevés si au moins une substance modificatrice, oxyde d'yttrium et/ou de terre rare se trouve dans le corps du grain dans une concentration au moins aussi élevée que l'est sa concentration à la surface du grain.

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