칼슘이 첨가된 란탄-아크롬산 염과 이트리아 안정화 지르코니아 계면간의 반응

최진삼; Jin Sam Choi

Korean Journal of Materials Research, Vol.11, No.6, 460-464, June, 2001

Export Citation

칼슘이 첨가된 란탄-아크롬산 염과 이트리아 안정화 지르코니아 계면간의 반응

Reaction between Calcium-doped Lanthanum Chromite and Yttria Stabilized Zirconia

최진삼

경상대학교 생산기술연구소

Jin Sam Choi

Research Institute of Industrial Technology, Kyungsang Nat. Univ., Jinju, 660-701, Korea

초록

Pechini방법으로 제조한 La 0.8 Ca 0.2 CrO 3 CLC소결체와 La 0.8 Ca 0.2 CrO 3 CLC-Green체를 YSZ에 적층한 후 온도의 함수로 계면에서의 미세구조와 성분이동 등의 거동을 고찰하였다. CLC-G/CLC와 CLC/YSZ계면에서의 CLC면은 반응온도에 상관없이 XRD 관찰에서 주상은 La 1?x Ca x CrO 3 그리고 CLC와 반응하지 않은 YSZ면의 결정 상은 cubic-ZrO 2 으로 각각 나타났다. CLC/YSZ반응 계면의 성분이동은 Zr > La>>Cr>>>Ca 순이었으며, 온도에 따른 개개 성분의 이동도 차이는 크지 않았다. CLC/YSZ계면간의 결합은 계면성분간의 과다한 성분이동 없이 현 연구의 온도전체에 걸쳐 가능한 것으로 나타났다. CLC-G/CLC간의 SEM미세구조는 결합 면을 경계로 저온에서는 결정의 입자크기 차이를 보이다가 온도가 증가할수록 균일화되는 경향을 보였다.였다. 보였다.

The ceramic diffusion coupling with the green body of calcium-doped lanthanum chromite(La 0.8 Ca 0.2 CrO 3 CLC- G) and sintered calcium-doped lanthanum chromite(La 0.8 Ca 0.2 CrO 3 CLC) by Pechini's method on yttria stabilized zirconia(YSZ) plate has been investigated. The X-ray diffraction pattern of CLC sides at the reacted CLC-G/ CLC and CLC/YSZ interface were identified as La 1?x Ca x CrO 3 and the unreacted YSZ side was cubic-ZrO 2 at the treated condition, 1300~1500 C for 10 hr in air, respectively. The order of migration components between CLC/YSZ interface was Zr>La>>Cr>>>Ca and these changes were not dependent upon the treated conditions. The grain shape and size at the interface of CLC-G/CLC was appeared to have a uniform distribution with increasing temperature. The bonding reaction of YSZ/CLC was occurred without a large amount change of the compositions in SEM photos.

Keywords:Pechini method;La 0.8 Ca 0.2 CrO 3 /ysz interface;Bonding

[References]

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[1] Minh NQ, J. Am. Ceram. Soc., Ceramic Fuel Cells, 76(3), 563 (1993)

[2] Fickett AP, 'Fuel Cell Electrocatalysts-Where Have We Failed,' Electrochem. Soc. Spring Meeting, Philadelphia (1977) (1977)

[3] Phillips SV, Datta AK, Lakin L, 'Bonding Technology in Fabrication of Zirconia Based Solid Oxide Fuel Cells,' ; in Proc. of the Second Int. Symp. on SOFC Luxembourg, pp737 (1991) (1991)

[4] Kawada T, Sakai N, Yokokawa H, Dokiya M, Anzai I, J. Ceram. Soc. Japan, 100(6), 847 (1992)

[5] Sah RJ, Zurell K, Koch A, 'Development of Manifolds for Planar SOFC Modules,' : in 1992 Fuel Cell Seminar, Washington, DC, pp257 (1992) (1992)

[6] Sakai N, Kawada T, Yokokawa H, Dokiya M, Science and Technology of Zironia V, Section VI : Solid Oxide Fuel Cells, pp764 (1992) (1992)

[7] De Villiers JPR, Muan A, J. Am. Ceram. Soc., 75(6), 1333 (1992)

[8] Sakai N, Kawada T, Yokokawa H, Dokiya M, Kojima I, J. Am. Ceram. Soc., 76(3), 609 (1982)

[9] Kertesz M, Riess I, Tannhauser DS, Lanhpage R, Rohr FJ, J. Solid State Chem., 42, 125 (1982)

[10] Horita T, Sakai N, Kawada T, Yokokawa H, Dokiya M, Denki Kagaku, 61, 760 (1993)

[11] Horita T, Choi JS, Lee YK, Sakai N, Kawada T, Yokokawa H, Dokiya M, J. Am. Ceram. Soc., 78, 1729 (1995)

[12] Carter JD, Appel CC, Mogensen M, J. Solid State Chem., 122, 407 (1996)

[13] Pechini MP, U. S. Patent No. 3, 330, 697

[14] Kondoh J, Kikuchi S, Tomii Y, Ito Y, J. Electrochem. Soc., 145(5), 1550 (1998)