Thermo-insulating elements based on thermally stabilized refractory ceramic fibers.

摘要

The invention relates to a thermally insulating refractory element formed essentially of refractory ceramic fibers mechanically associated with each other, the composition of which comprises at least 97.5% by weight of alumina, silica and zirconia in total, characterized in that: BR/ a) no organic or inorganic binder binds the fibers together; BR/ b) the fibers have the following chemical composition, in% by weight: BR/ (CF DRAWING IN BOPI) BR/ BR/ other oxides: 2 O3 + TiO2 = 0.20% and Na 2 O + CaO + K 2 O = 0.30%; BR/ c) said fibers have homogeneously throughout the mass of the element a degree of crystallinity of at least 30% and at most 64%, the crystals present being essentially formed of mullite crystals and quadratic zirconia; and BR/ d) said element has a linear shrinkage of at most 3% after holding for 24 hours at 1450 ° C. / P