High-resistivity refractory having a high zirconia content

Details High-resistivity refractory having a high zirconia content High-resistivity refractory having a high zirconia content

C - Chemistry, Metallurgy

04

B

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

Patent

CA 2643334

The invention relates to a novel melted and cast refractory product having a high zirconia content and having an improved electrical resistivity. This refractory product comprises, in percentages by weight on the basis of the oxides and for a total of more than 98.5%: - ZrO2 + Hf2O: > 85%; SiO2: 2% to 10%; Al2O3: 1% to 2.4%: B2O3: < 1% and a dopant chosen from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a quantity by weight such that 0.2 % <= 2.43´V2O5+8.84´CrO3+1.66´Nb2O5+6.14´MoO3+Ta2O5+3.81´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 %; ZrO2 + Hf2O : > 85 %; SiO2 : 2 % à 10 %; AI2O3 : 1 % à 2,4 %; B2O3 : < 1 %, 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+8,84.CrO3+1,66.Nb2O5+6,14.MoO3+Ta2O5+3,81.WO3.

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