Sintering of fine oxide powders: OO, sintering mechanisms

摘要

Conventional and new sintering mechanisms have been investigated using fine powders of CeO_2 and Y_2O_3 of excel- lent sinterability. We have verified the validity of Herring's scaling law for 60/100-84/100 relative density and found that it is consistent with grain-boundary-diffusion control. At lower densities, we have found that pores larger than the critical size, in the sense of Kingery and Francois, can still be sintered readily.