| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat insulator with improved heat resistance at high temperatures, and a method of manufacturing the heat insulator.SOLUTION: A heat insulator is obtainable by sintering a raw material containing 52-93 wt.% of alumina particles having a mean particle size of 100 nm or less, 1-45 wt.% of one or more crystal transition suppressing materials selected from silica particles, silica, talc, mullite, silicon nitride, silica fume, Wollastonite, bentonite, kaolin, sepiolite, and mica particles, 0-40 wt.% of a radiation scattering material, and 1-20 wt.% of a fiber. |
