Abstract: Composite AlN powder, mixed with the sintering additive Y_₂O_₃, was synthesized by the direct
nitridation of molten Al-Mg-Y alloys. The character of products was determined by means of electron microscopy, X-ray diffraction,
granularmetric analysis and chemical composition analysis etc. The results show that the nitridation rate of the raw alloys is higher,
and the nitridation products are porous enough to be easily crushed. Composite AlN powder, obtained by the Lanxide method, has excellent
characters such as high purity, especially low oxygen content, and narrow well-distributed grain size and so on.

Key words: AIN powder, Lanxide method, aluminium alloys, sintering additives