The high-temperature stability of YSZ specimens fabricated by die pressure and cold isostatic press (CIP) is investigated in CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO molten salt at 1,150 ℃. The experimental results are as fo...
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https://www.riss.kr/link?id=A106827606
김완배 (충남대학교) ; 권숙철 (충남대학교) ; 조수행 (급속응고신소재연구소) ; 이종현 (충남대학교) ; Kim, Wan-Bae ; Kwon, Suk-Cheol ; Cho, Soo-Haeng ; Lee, Jong-Hyeon
2020
Korean
SCOPUS,KCI등재,ESCI
학술저널
176-183(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
The high-temperature stability of YSZ specimens fabricated by die pressure and cold isostatic press (CIP) is investigated in CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO molten salt at 1,150 ℃. The experimental results are as fo...
The high-temperature stability of YSZ specimens fabricated by die pressure and cold isostatic press (CIP) is investigated in CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO molten salt at 1,150 ℃. The experimental results are as follows: green density 46.7 % and 50.9 %; sintering density 93.3 % and 99.3 % for die press and CIP, respectively. YSZ foremd by CIP exhibits higher stability than YSZ formed by die press due to denseness dependency after high-temperature stability test. YSZ shows peaks mainly attributed to CaZrO<sub>3</sub>, with a small t-ZrO<sub>2</sub> peak, unlike the high-intensity tetragonal-ZrO<sub>2</sub> (t-ZrO<sub>2</sub>) peak observed for the asreceived specimen. The t-ZrO<sub>2</sub> phase of YSZ is likely stabilized by Y<sub>2</sub>O<sub>3</sub>, and the leaching of Y<sub>2</sub>O<sub>3</sub> results in phase transformation from t-ZrO<sub>2</sub> to m-ZrO<sub>2</sub>. CaZrO<sub>3</sub> likely forms from the reaction between CaO and m-ZrO<sub>2</sub>. As the exposure time increases, more CaZrO<sub>3</sub> is observed in the internal region of YSZ, which could be attributed to the inward diffusion of molten salt and outward diffusion of the stabilizer (Y<sub>2</sub>O<sub>3</sub>) through the pores. This results in greater susceptibility to phase transformation and CaZrO<sub>3</sub> formation. To use SOM anodes for the electroreduction of various metals, YSZ stability must be improved by adjusting the high-density in the forming process.
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