Densification and Electrical Resistance of Y2O3 at Various Pressures
The densification of Y2O3 has been previously reported by various investigators [1–4]. Schieitz and Wilder  studied the sintering of Y2O3 from 1210 to 1643°C in a vacuum furnace, with difficulties encountered in its complete densification and interpretation of the sintering data in terms of sintering models based on volume and grain boundary diffusion. Jorgensen and Anderson  showed that the addition of up to 10 m% ThO2 to Y2O3 inhibits grain growth during sintering, and allows the sintering process to proceed to essentially theoretical density of the specimens. These investigators  were unable to obtain theoretical density of the pure Y2O3 specimens heated to 2000°C in a resistance furnace. Transparent Y2O3 was reported by Lefever and Matsko  using vacuum hot pressing at 950°C and pressures up to 830 bars. Füll transparency was achieved according to these investigators  by adding LiF to Y2O3. Dutta and Gazza  used vacuum hot pressing at temperatures ranging from 1300 to 1500°C and pressures up to 480 bars to produce transparent Y2O3 specimens. The present work was undertaken in order to determine the densification of Y2O3 with or without ThO2 additions using vacuum sintering, regulär hot pressing, and high pressure hot pressing techniques.
KeywordsTheoretical Density Vacuum Sinter Complete Densification Resistance Vacuum Electron Microprobe Technique
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