| 摘要 |
PROBLEM TO BE SOLVED: To provide porous ceramic which is a material suitable for a heat-insulating material, and which has little temperature dependency of heat conductivity, especially at a high temperature region.SOLUTION: Spinel-based porous ceramic having porosity of ≥65 to ≤90 vol.%, and represented by chemical formula: XAlOis constituted of ceramic particles wherein, in the chemical formula, X is any of Zn, Fe, Mg, Ni and Mn; coarse pores whose pore size is larger than 1,000 μm occupy ≤25 vol% of the whole pore volume; fine pores whose pore size is ≤0.45 μm occupy ≥5 to ≤40 vol% of the pore volume whose pore size is ≤1,000 μm; at least one pore size distribution peak exists in the pore size range of ≥0.14 to ≤10 μm; and the arithmetic average particle size is in the range of ≥0.04 to ≤1 μm. |
