PREPARATION METHOD OF BETA-SIALON SINTERED BODY

摘要

High strength sintered beta sialon containing aluminum nitride poly type 21R or 15R is produced by nitriding with AlN 1 mol, SiO2 0.2-4 mol, and Al2O3 0.05 mol in the nitrogen atmosphere; beta sialon is pressurelessly sintered with Si3N4 61-88 wt.%, Al2O3 2.5-9 wt.%, and Y2O3 6-15 wt.%, adding AlN polytype 21R 3.5-10 wt.% in the same atmosphere at 1750-1850 deg.C; By thermal treatment of the sintered body at 1200-1400 deg.C, the crystalline phase of Yttrium aluminum oxide Y4Al2O9 is deposited.