| 摘要 |
PROBLEM TO BE SOLVED: To produce an easily sinterable α-alumina fine powder being a sintering raw material for a translucent alumina ceramic and having <=100 nm average particle diameter. SOLUTION: In this method for producing α-alumina powder by using an aluminum salt such as ammonium aluminum carbonate, aluminum sulfate, ammonium aluminum sulfate and aluminum nitrate, an aluminum hydroxide or intermediate alumina powder as a starting raw material and heating the starting raw material, the α-alumina fine powder having <=100 nm average particle diameter is obtained by performing the heat treatment in a vacuum of <=1 Pa or a hydrogen atmosphere. |
