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AssigneeSociete Europeenne des Produits Refractaires
InventorsDaniel Urffer, Joseph Recasens
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The invention relates to a refractory thermally-insulating component consisting essentially of refractory ceramic fibers which are mechanically combined with one another, the composition of which comprises at least 97.5% by weight of alumina, silica and zirconia in total, wherein: a) no organic or inorganic binder binds the fibers to one another; b) the fibers have the following chemical composition, as % by weight: Al.sub.2 O.sub.3 : 33-45% SiO.sub.2 : 41-53% ZrO.sub.2 : 5.5-17% MgO: 0.02-2% other oxides:<0.50% with Fe.sub.2 O.sub.3 +TiO.sub.2 .ltoreq.0.20% and Na.sub.2 O+CaO+K.sub.2 O.ltoreq.0.30%; c) the said fibers homogeneously have, throughout the entire body of the component, a degree of crystallinity of not less than 30% and not more than 64%, the crystals present being essentially formed of mullite crystals and of quadratic zirconia; and d) the said component has a linear shrinkage of no more than 3% after being held for 24 hours at 1450.degree. C.
A refractory, thermally-insulating component which displays a linear shrinkage not exceeding 3% after exposure to a temperature of 1450.degree. C. for 24 hours and which consists essentially of refractory ceramic fibers which are mechanically entangled and not bound by organic or inorganic binders, each said fiber being formed of a composition comprising 33-45 wt % Al.sub.2 O.sub.3, 41-53 wt % SiO.sub.2, 5.5-7 wt % ZrO.sub.2, 0.02-2 wt % MgO, up to 0.2 wt % Fe.sub.2 O.sub.2 +TiO.sub.2 and up to 0.3 wt % Na.sub.2 O+CaO+K.sub.2 O, the amount of Al.sub.2 O.sub.3 +SiO.sub.2 +ZrO.sub.2 being at least 97.5 wt %, and each fiber having a homogenous degree of crystallinity of between 30 and 64%, crystals therein being essentially mullite and quadratic zirconia.
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