Inorganic fiber block

Abstract

An inorganic fiber block obtained by stacking blanket-like products each including inorganic fibers, wherein the composition of the inorganic fibers have the following composition: SiO 2 : 66 to 82 mass %, CaO:10 to 34 mass %, MgO: 0 to 3 mass %, Al 2 O 3 : 0 to 5 mass %, and the total of SiO 2 , CaO, MgO and Al 2 O 3 is 99 mass % or more.

1 . An inorganic fiber block obtained by stacking blanket-like products each comprising inorganic fibers, wherein the composition of the inorganic fibers have the following composition:
 SiO 2 : 66 to 82 mass %   CaO: 10 to 34 mass %   MgO: 0 to 3 mass %   Al 2 O 3 : 0 to 5 mass %,   
       and the total content of SiO 2 , CaO, MgO and Al 2 O 3  is 98 mass % or more. 
     
     
         2 . The inorganic fiber block according to  claim 1 , wherein the inorganic fibers have the following composition:
 SiO 2 : 71 to 80 mass %   CaO: 18 to 27 mass %   
       MgO: 0 to 3 mass % 
       Al 2 O 3 : 1.1 to 3.4 mass %, 
       provided that the content of each of ZrO 2  and R 2 O 3  (R is selected from Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or a mixture of these) is 0.1 mass % or less, the content of an alkaline metal oxide is 0.2 mass % or less, and the total content of SiO 2 , CaO, MgO and Al 2 O 3  is 99 mass % or more. 
     
     
         3 . The inorganic fiber block according to  claim 1 , wherein the inorganic fibers have the following composition:
 SiO 2 : 71 to 80 mass %   CaO:18 to 27 mass %   MgO: 0 to 3 mass %   Al 2 O 3 : 2.0 to 3.4 mass %,   
       provided that the content of each of ZrO 2  and R 2 O 3  (R is selected from Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or a mixture of these) is 0.1 mass % or less, and the total content of SiO 2 , CaO, MgO and Al 2 O 3  is 99 mass % or more. 
     
     
         4 . The inorganic fiber block according to  claim 1 , which keeps its original shape after heating at least at 1000° C. for 8 hours. 
     
     
         5 . The inorganic fiber block according to  claim 1 , which keeps its original shape after heating at least at 1300° C. for 8 hours. 
     
     
         6 . A heat insulating structural body obtained by arranging two or more inorganic fiber blocks according to  claim 1  such that they are adjacent with each other. 
     
     
         7 . The heat insulating structural body according to  claim 6 , wherein joint opening between the inorganic fiber blocks constituting the heat insulating structural body or between the blankets constituting the inorganic fiber block is 7.5 mm or less after heating at 1300° C. for 24 hours.