Refractory product having high zirconia content
AssigneeSaint-Gobain Centre de Recherches et d'Etudes European
InventorsIsabelle Cabodi, Michel Gaubil
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Abstract
The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+Hf2O: remainder to 100% 4.0%<SiO2<6.5% Al2O3≦0.75% 0.2%<B2O3<1.5% 0.3%<Ta2O5 Nb2O5+Ta2O5<1.4% Na2O+K2O<0.2% BaO<0.2% P2O5<0.15% Fe2O3+TiO2<0.55% other oxide species: <1.5% the “A/B” ratio of Al2O3/B2O3 content by weight being no higher than 1.50. The invention can be used in glass melting furnaces.
Claims20
A fused cast refractory product comprising, in percentages by weight based on the oxides and for a total of 100% of the oxides:
- ZrO2+Hf2O:
- complement to 100%
- 4.0%<SiO2<6.5%
- Al2O3≦0.75%
- 0.2%<B2O3<1.5%
- 0.3%<Ta2O5
- Nb2O5+Ta2O5<1.4%
- Na2O+K2O<0.2%
- BaO<0.2%
- P2O5<0.15%
- Fe2O3+TiO2<0.55%
- other oxide species:<1.5%
- the ratio “NB” of the contents by weight Al2O3/B2O3 being less than 1.50.
The product as claimed in claim 3, wherein the ratio A/B is less than 1.40.
Dependencies are inferred from the claim text.