| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite heat insulator which maintains heat insulation property at high temperature and besides, has light weight and enables handleability thereof during work to be improved.SOLUTION: There is provided the composite heat insulator which is constituted of: a porous sintered body that is a spinel composed of a chemical formula XAlO, where X is one of Zn, Fe, Mg, Ni and Mn; and a fiber layer containing an aggregate of fiber composed of an inorganic material formed on at least one surface of the porous sintered body and which has a porosity of 70% or more. In the composite heat insulator, pore having a pore diameter of over 1000 μm accounts for 10 vol% or less of the whole pores, pore having a pore diameter of 0.01 to 0.8 μm accounts for 10 to 30 vol% of the pore having a pore diameter of 1000 μm or less and pore having a pore diameter of 0.8 to 10 μm accounts for 50 to 80 vol% of the pore having a pore diameter of 1000 μm or less, and a silica component in the fiber of the fiber layer is 55 wt.% or less.SELECTED DRAWING: None |
