| 摘要 |
The present invention concerns an unshaped product comprising a particulate mixture consisting of: - a coarse fraction, representing more than 50% and less than 91% of the particulate mixture, in mass percentage, and consisting of particles having a size greater than or equal to 50 µm, referred to as "coarse particles", and - a matrix fraction, forming the remainder up to 100% of the particulate mixture, and consisting of particles having a size less than 50 µm, referred to as "matrix particles", the product having a chemical analysis, in mass percentage based on the oxides of the product, such that: - 45% < Al2O3, -7.5% < SiO2 < 35%, - 0% ≤ ZrO2 < 33%, provided that 10% < SiO2 + ZrO2 < 54%, - 0.15% < B2O3 < 8 %, - other oxides: < 6 %, Al2O3 forming the remainder up to 100%, said coarse fraction comprising more than 15% coarse particles having a size greater than 1 mm, in mass percentage based on the particulate mixture, said matrix fraction having a chemical analysis, in mass percentage based on the oxides of the matrix fraction, such that: - Al2O3 + SiO2 + ZrO2 > 86%, provided that 35% < Al2O3. Application to a glass furnace. |
