Crystallising the grain-boundary glass of a liquid-phase-sintered Si3N4 ceramic for 2h or less at 1500 degees C led to formation of delta-Y2Si2O7. After 5h at 1500 degrees C, the delta-Y2Si2O7 had transformed to beta-Y2SiO7 with a concurrent dramatic increase in the dislocation density within beta-Si3N4 grains.
Origin
Ohio State University
Journal Title
J Am Ceram Soc 1989 72 10 1931-1937
Sector
Special Glass
Class
S 329