| 摘要 |
PROBLEM TO BE SOLVED: To provide an α-alumina compact capable of producing efficiently a sapphire single crystal, and to provide a production method thereof.SOLUTION: There is provided an α-alumina compact in which a bulk density as an aggregate of compacts is 1.0 g/cmor more and below 1.5 g/cm, which is a compact in which a volume per piece is 0.01 cmor more and 1 cmor less, a relative density is 40% or higher and below 60%, crushing strength is 80 N or more, and a specific surface area is over 1 m/g and 4 m/g or less.SELECTED DRAWING: None |
