Hot Pressing of Y2O3 Doped Si3N4 Ceramics
The effect of seeding on the microstructure and mechanical properties of hot-pressed silicon nitride was investigated by introducing large, elongated b-Si3N4 particles into an α-Si3N4 matrix. Densification and fracture toughness were followed in the presence of Y2O3 as sintering aid. The concentration of seeds varied from 0 to 5 wt%. The maximum fracture toughness was 8.0 MPam1/2 for a material with 3 wt% seeds, hot pressed at 1750oC, for 4h.
Dragan P. Uskokovic, Slobodan K. Milonjic, Djan I. Rakovic
D. Bučevac, "Hot Pressing of Y2O3 Doped Si3N4 Ceramics", Materials Science Forum, Vol. 494, pp. 423-428, 2005