Refractory material having high zirconia content and high...

Details Refractory material having high zirconia content and high... Refractory material having high zirconia content and high...

C - Chemistry, Metallurgy

04

B

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

Patent

CA 2696533

The invention relates to a novel molten and cast refractory product having a high zirconia content and an improved electric resistivity. The refractory product includes, in mass % based on oxides and for a total of more than 98.5%: - ZrO2+ Hf2O : > 85 % - SiO2 : > 10 % to 12 % - AI2O3 : 0.1 % to 2.4 % - B2O3 : < 1.5 %, and a doping agent selected from the group comprising V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3 and mixtures thereof, in a weighed amount such that 0.2 % < 2.43. V2O5+4.42.CrO3+1.66. Nb2O5+3.07.MoO3+Ta2O5+1.91.WO3.

L'invention concerne un nouveau produit réfractaire fondu et coulé à forte teneur en zircone présentant une résistivité électrique amélioré Ce produit réfractaire, comporte, en pourcentages massiques sur la base des oxydes et pour un total de plus de 98,5 %.cndot.-ZrO2 + Hf2O > 85 % - SIO2 > 10 % à 12 % - AI2O3 0,1 % à 2,4 % - B2O3 - < 1,5 %, et - un dopant choisi dans le groupe formé par V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, et leurs mélanges, en une quantité pondérée telle que 0,2 % < 2,43. V2O5+4,42.CrO3+1,66 Nb2O5+3,07 MoO3+Ta2O5+1,91 WO3.

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