On the densification mechanism of nano grained Yttrium aluminum garnet transparent ceramic during high pressure sintering process

Abstract The sintering densification mechanism of nano grained Yttrium aluminum garnet transparent ceramic during high pressure sintering process can be divided into three period. The first sintering stage can be described as plastic deformation after yield point. The intermediate stage is conducted by grain boundary viscous sliding. The grain boundary diffusion is the significant contribution for the final sintering densification period.