Patent ID: 9139448
Filing Date: 2015-09-22
Classification: C01F,C04B

Abstract:
1. A heat-insulating material formed of a spinel porous sintered body having a porosity of from 65 vol. % to 90 vol. % and represented by a chemical formula XAl 2 O 4 , wherein X in said chemical formula is selected from the group consisting of Zn, Fe, Mg, Ni, and Mn, large pores having a pore diameter of greater than 1000 μm occupy 25 vol. % or less of the total volume of pores in the heat-insulating material, fine pores having a pore diameter of 0.45 μm or less occupy 5 vol. % to 40 vol. % of the volume of the pores having a pore diameter of 1000 μm or less, at least one pore-diameter distribution peak is within a pore diameter range of from 0.14 μm to 10 μm, and a calculated average particle diameter of sintered particles is from 0.04 μm to 1 μm.