| 摘要 |
PURPOSE:To produce the titled AlN powder having small particle diameter and with less variance of particle shapes and particle diameters by mixing Al, carbon powder, and a group IIa element compd. in a specified ratio in an aq. medium, drying the mixture, and then baking the dried mixture under specified conditions. CONSTITUTION:From 0.34 to 0.37pt.wt. carbon powder and 0.005-1.0pt.wt. at least one kind among group IIa element compds. and group IIIa rare earth element compds. are mixed with 1pt.wt. Al powder or compd. forming Al powder at a temp. below the baking temp., and the mixture is dried. The purity of the Al powder, etc., is controlled to about 99%, and the mean particle diameter is adjusted to <=3mu. The purity of carbon powder is regulated to 99%, and the mean particle diameter is controlled to <=about 1mu. The means particle diameter of the group IIa element compd., etc., is controlled to <=about 5mu. Then the dried mixture is baked at 1,400-1,700 deg.C in a nitrogen-contg. nonoxidizing atmosphere. Fine and homogeneous Al powder is obtained in this way.
|
