CPC C03B 5/43 (2013.01) [C03B 5/2375 (2013.01); C03B 5/26 (2013.01); C04B 35/12 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3418 (2013.01)] | 26 Claims |
1. A glass furnace comprising an additive-containing product comprising, exclusively at the surface, an additive selected from:
phosphorus compounds other than glasses and vitroceramics,
WC, MoO3,
silicon carbide,
boron carbide,
silicon nitride,
boron nitride,
glasses comprising elemental phosphorus and/or iron and/or tungsten and/or molybdenum,
vitroceramics comprising elemental phosphorus and/or iron and/or tungsten and/or molybdenum,
and their mixtures,
said additive-containing product, without taking into account said additive,
having the following chemical analysis, as a percentage by weight on the basis of the oxides:
Cr2O3≥2%, and
Cr2O3+Al2O3+CaO+ZrO2+MgO+Fe2O3+SiO2+TiO2≥90%, and
Cr2O3+Al2O3+MgO≥60%,
the content by weight of additive being in the range 0.01% 6% on the basis of the additive-containing product.
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