High zirconia refractory material

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/484 (2006.01)

Patent

CA 2728061

The invention relates to a molten cast refractory material comprising, in oxide wt % and totaling 100%: - ZrO2 + HfO2: the remainder of 100%; - SiO2: 3.5% to 6.0%; - Al2O3: 0.7% to 1.5%; - Na2O + K2O: 0.10 % to 0.43 %; - B2O3: 0.05% to 0.80%; - CaO + SrO + MgO + ZnO: < 0.4%; - P2O5:  < 0.05%; - Fe2O3 + TiO2: < 0.55%; - other species: < 1.5%; the wt % ratio for Al2O3/(Na2O + K2O) being greater than or equal to 3.5 and the wt % ratio for B2O3/(Na2O + K2O) being 0.3 to 2.5.

Produit réfractaire fondu et coulé comportant, en pourcentages massiques sur la base des oxydes et pour un total de 100 %:- ZrO2 + HfO2 : complément à 100 % - SiO2 : 3,5 % à 6,0 % - AI2O3 : 0,7 % à 1,5 % - Na2O + K2O : 0,10 % à 0,43 %- B2O3 : 0,05 % à 0,80 % - CaO + SrO + MgO + ZnO : < 0,4 % - P2O5 : < 0,05 % - Fe2O3 + TiO2 : < 0,55 % - autres espèces : < 1,5 %, le rapport des pourcentages massiques AI2O3 /(Na2O+K20) étant supérieur ou égal à 3,5 et le rapport des pourcentages massiques B2O3 /(Na2O+K20) étant compris entre 0,3 et 2,5.

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