| 摘要 |
PURPOSE:To reduce the firing temperature, by mixing alumina powder with carbon powder, etc., and adding a metal (compound), e.g. Mg, Ca, Zr or Sn, etc., before firing and firing the resultant mixture in an atmosphere containing nitrogen to produce AlN based powder. CONSTITUTION:Alumina or a compound capable of forming alumina in a firing process is mixed with carbon powder or a compound capable of forming carbon at a high temperature and a substance selected from AlN powder, silicon nitride powder, silicon carbide powder and substances capable of forming such powders is added to the resultant mixture. At least one of metal (compound), e.g. Mg, Ca, Zr, Sn, etc., or salt thereof in an amount of 0.1-10pts.wt. based on 100pts. wt. alumina powder is added to the mixed powder. The resultant mixture is then fired in a nonoxidizing atmosphere containing nitrogen to afford the aimed fine aluminum nitride based powder having a uniform particle diameter at a relatively low firing temperature using the raw material alumina having a relatively large particle diameter.
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