期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 101, 期 8, 页码 3282-3287出版社
WILEY
DOI: 10.1111/jace.15485
关键词
field-assisted sintering technology; flash-sintering; transmission electron microscopy; zirconia
资金
- KAKENHI [250525106001, 25106004, 25106006, A-STEP / AS282I004e]
- Adaptable and Seamless Technology Transfer Program [AS282I004e]
- Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [17H03378, 25106004] Funding Source: KAKEN
It is difficult to obtain pure ZrO2 sintered compacts with a bulk style at room temperature because a large volumetric expansion from tetragonal to monoclinic phase (t/m) transformation occurs at around 1000 degrees C, which is lower than the sintering temperature. In contrast, pure monoclinic ZrO2 can be consolidated without shattering using flash-sintering at 1350 degrees C for 5minutes under an applied DC electric field of 175V/cm. High-resolution transmission electron microscopy and electron energy loss spectroscopy have revealed that amorphous films are formed along grain boundaries after flash-sintering at 1350 degrees C for 5minutes. Monoclinic ZrO2 flash-sintered compact including the amorphous films are able to survive without shattering through the t/m transformation, as the amorphous films partially absorb the large volumetric expansion arising from the t/m transformation. The formation of the amorphous films results from the severe reducing condition due to the applied DC electric fields during flash-sintering.
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