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2020 Vol.30, Issue 4 Preview Page
Effect of Pressing Process on the High-Temperature Stability of Yttria-Stabilized Zirconia Ceramic Material in Molten Salt of CaCl2-CaF2-CaO

CaCl2-CaF2-CaO 용융염에서 YSZ 세라믹의 고온 안정성에 미치는 성형공정의 영향

Wan-Bae Kim1
,
Suk-Cheol Kwon1
,
Soo-Haeng Cho2
,
Jong-Hyeon Lee123†
김 완배1
,
권 숙철1
,
조 수행2
,
이 종현123†
1Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2Rapidly Solidified Materials Research Center (RASOM), Chungnam National University, Daejeon 34134, Republic of Korea
3Graduate School of Energy Science and Technology, Chungnam National University, Daejeon 34134, Republic of Korea
1충남대학교 신소재공학과
2충남대학교 급속응고신소재연구소
3충남대학교 에너지과학기술대학원
†Corresponding author E-Mail : jonglee@cnu.ac.kr (J.-H. Lee, Chungnam Nat’l Univ.)
April 2020. pp. 176-183
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Abstract

The high-temperature stability of YSZ specimens fabricated by die pressure and cold isostatic press (CIP) is investigated in CaCl2-CaF2-CaO molten salt at 1,150 °C. 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 CaZrO3, with a small t-ZrO2 peak, unlike the high-intensity tetragonal-ZrO2 (t-ZrO2) peak observed for the asreceived specimen. The t-ZrO2 phase of YSZ is likely stabilized by Y2O3, and the leaching of Y2O3 results in phase transformation from t-ZrO2 to m-ZrO2. CaZrO3 likely forms from the reaction between CaO and m-ZrO2. As the exposure time increases, more CaZrO3 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 (Y2O3) through the pores. This results in greater susceptibility to phase transformation and CaZrO3 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.

Keywords
high-temperature stability
yttria stabilized zirconia
solid oxide membrane
degradation
molten salt
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 30
  • No :4
  • Pages :176-183
  • Received Date : 2020-02-28
  • Revised Date : 2020-03-23
  • Accepted Date : 2020-03-23
  • DOI :https://doi.org/10.3740/MRSK.2020.30.4.176
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