Refractory material with doped zirconia content

Details Refractory material with doped zirconia content Refractory material with doped zirconia content

C - Chemistry, Metallurgy

04

B

C04B 35/484 (2006.01) C03B 5/43 (2006.01) C04B 35/657 (2006.01)

Patent

CA 2696405

The invention relates to a molten and cast refractory product having a high zirconia content, that comprises in mass % on the basis of oxides: - ZrO2 + Hf2O : > 85 % - SiO2 : 6 % to 12 % - AI2O3 : 0.4 % to 1 % - Y2O3 : < 0.2 %, a doping agent selected from the group comprising Nb2O5, Ta2O5 and mixtures thereof, in an amount such that the molar ratio ZrO2 / (Nb2O5H-Ta2O5) ranges from 200 to 350.

L'invention concerne un produit réfractaire fondu et coulé à forte teneur en zircone, comportant, en pourcentages massiques sur la base des oxydes :-ZrO2 + Hf2O : > 85 %- SiO2 : 6 % à 12 % - Al2O3: 0,4 % à 1 % - Y2O3 : < 0,2 %, un dopant choisi dans le groupe formé par Nb2O5, Ta2O5 et leurs mélanges, en une quantité telle que le rapport molaire ZrO2 /(Nb2O5II-Ta2O5) soit compris entre 200 et 350.

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