Zirconia sinter, process for producing the same, grinding...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/486 (2006.01) A61C 7/14 (2006.01) A61K 6/06 (2006.01) B02C 17/20 (2006.01) C04B 35/488 (2006.01) C09K 3/14 (2006.01)

Patent

CA 2164118

A zirconia sinter stabilized by rare earth metal oxide(s) containing a boron compound and having a high fracture toughness and excellent mechanical strength and thermal stability. The sinter mainly comprises ZrO2 and contains at least one rare earth metal oxide (R2O3) selected from among Yb2O3, Er2O3, Ho2O3, Y2O3 and Dy2O3, a boron compound and optionally Al2O3 and/or SiO2. The molar ratio of R2O3 to ZrO2 ranges from 1.3/98.7 to less than 2/98, and the boron content is 0.05-80 mole % in terms of B2O3 (and further the Al2O3 content is 0.1-5 mole % and the SiO2 content is 0.05-1.5 mole %).

Produit fritté à base de zircone stabilisé par un ou plusieurs oxydes métalliques des terres rares renfermant un composé de bore et présentant une ténacité élevée ainsi qu'une résistance mécanique et une stabilité thermique excellentes. Ce produit comporte principalement du ZrO¿2? et contient au moins un oxyde métallique des terres rares (R¿2?O¿3?) choisi parmi Yb¿2?O¿3?, Er¿2?O¿3?, Ho¿2?O¿3?, Y¿2?O¿3? et Dy¿2?O¿3?, un composé de bore et éventuellement du Al¿2?O¿3? et/ou du SiO¿2?. Le rapport molaire entre R¿2?O¿3? et ZrO¿2? est compris entre 1,3/98,7 et moins de 2/98, et la teneur en bore sous forme de B¿2?O¿3? est comprise entre 0,05 et 80 % en mole. En outre, la teneur en Al¿2?O¿3? est comprise entre 0,1 et 5 % en mole et la teneur en SiO¿2? est comprise entre 0,05 et 1,5 % en mole.

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