Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 8, Pages 4567-4571Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.03.005
Keywords
Flash sintering; Field assisted sintering technology; Zirconia; Rate controlled sintering; Sintering
Categories
Funding
- Adaptable and Seamless Technology Transfer Program [ASTEP: JPMJTS1617]
- Core Research for Evolutionary Science and Technology from the Japan Science and Technology Agency (JST) [CREST: JPMJCR1996]
- Japan Society for the Promotion of Science (KAKENHI) [JP19H05785]
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The study employed rate-controlled sintering method for 8YSZ polycrystals, achieving constant linear shrinkage of green compacts through rating the current limit of AC electric field. A near-theoretical density 8YSZ polycrystal was successfully produced with a grain size of approximately 3.4 μm by setting the maximum current limit at 1150 mA in an AC electric field.
Rate-controlled sintering of 8 mol%Y2O3-doped ZrO2 (8YSZ) polycrystals was performed by rating the current limit of alternating current (AC) electric field during a flash event; this method promotes constant linear shrinkage of the green compact with respect to the sintering time. A power dissipation peak associated with the flash event was suppressed by setting the initial current limit at 100 mA; after AC current hits 100 mA, the current limit was rated to a maximum value of 1100-2000 mA to keep shrinkage rate constant. The power dissipation behavior during the current-rating process exhibited a characteristic inverted S-shaped curve as a function of time. 8YSZ polycrystal with a near-theoretical density of 5.97 g/cm3 and a grain size of approximately 3.4 ?m was produced in AC electric field (150 V/cm at 1000 Hz) with a final maximum current limit of 1150 mA as a rectangular bulk style.
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