| 摘要 |
<p>An aluminum nitride powder adapted for use in producing an aluminum nitride sinter having a high density and an excellent electrical conductivity, comprising primary particles which form an aggregate and which are each covered with 0.1 to 10 wt% (in terms of metal) of at least one of the oxides, oxynitrides and nitrides of yttrium. This powder is produced by mixing an alumina having a mean primary particle diameter of 5 νm or less and covered with yttrium or its compound with a carbon having an ash content of 0.5 % or less and a mean secondary particle diameter of 5 νm or less, and firing the mixture at 1400 to 1700 °C in a nitrogen or ammonia atmosphere. When 0.1 to 30 parts by weight of a binder comprising an organic polymer which decomposes below 1400 °C is added to 100 parts by weight of the aluminum nitride powder, a molding which has a reduced shrinkage factor, a uniformity, and a reduced anisotropy can be obtained.</p> |
