Saline soluble inorganic fibres

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 13/00 (2006.01) E04B 1/76 (2006.01)

Patent

CA 2470642

Thermal insulation is provided for use in applications requiring continuous resistance to temperatures of 1260 ~C without reaction with alumino-silicate firebricks, the insulation comprises fibres having a composition in wt% 65 %<SiO2 <86 %, MgO <10 %, 14 % < CaO < 28 %, A1203 <2 %, Zr02 <3 %, B203<5 %, P205 <5 %, 72 % <Si02+ZrO2+B203+5*P205, 95 % < Si02 + CaO + MgO + A1203 +Zr02 + B203 + P205. Addition of elements selected from the group Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or mixtures thereof improves fibre quality and the strength of blankets made from the fibres.

L'invention concerne un moyen d'isolation thermique destiné à des applications nécessitant une résistance continue à des températures égales à 1260 ·C sans que le moyen d'isolation thermique ne réagisse avec les briques réfractaires en aluminosilicate. Le moyen d'isolation contient des fibres dont la composition, en pourcentage en poids, est la suivante : 65 % < SiO¿2 ?< 86 % ; MgO < 10 % ; 14 % < CaO < 28 % ; Al¿2?O¿3? < 2 % ; ZrO¿2? < 3 % ; B¿2?O¿3? < 5 % ; P¿2?O¿5? < 5 % ; 72 % < SiO¿2? + ZrO¿2? + B¿2?O¿3? + 5*P¿2?O¿5? ; 95 % < SiO¿2 ?+ CaO + MgO + Al¿2?O¿3? + ZrO¿2? + B¿2?O¿3? + P¿2?O¿5?. L'ajout d'éléments sélectionnés parmi Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y ou des mélanges de ceux-ci améliore la qualité des fibres et la résistance des rouleaux formés à partir de ces fibres.

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