Pore Removal During Final Stage Sintering of Modified Yttria
Starting with a relative density of about 95%, the final stage sintering of Y2O3 doped with 30 mol% Gd2O3 is investigated in a temperature range from 1700℃ to 1900℃. The microstructural evolution is characterized by grain size, bulk porosity, interpore spacing, and pore size distribution. The pore removal is found to be grain boundary controlled by enhanced, but normal grain growth. Due to pore entrapment within grains, the densification stagnates before complete pore elimination is achieved. In an intermediate stage of this process, grain growth driven pore coalescence increases the size of pores located at the grain boundaries.
KeywordsPore Size Distribution Bulk Porosity Bimodal Pore Size Distribution Isothermal Sinter Pore Shrinkage
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