電解質陶瓷與電極之高溫介面反應研究(2/2)
Date Issued
2002
Date
2002
Author(s)
DOI
902216E002028
Abstract
The reaction kinetics between 8 mol% yttria-stabilized zirconia (YSZ) and 30 mol% Sr-doped Lanthanum Manganite
(La0.65Sr0.30MnO3, LSM) with A-site deficiency for the application of planar Solid Oxide Fuel Cells (SOFCs) were
investigated. YSZ was fabricated by tape casting and then coated with a layer of LSM by screen-printing. The
LSM/YSZ green tapes were co-fired from 1000°C to 1400°C for 1 h to 120 h and then annealed at 1000°C for up to
1000 h. The results showed that the inter-diffusion of cations between YSZ and LSM caused the amorphourization of
YSZ after co-firing at 1400°C/1 h. La2Zr2O7 (LZ) or SrZrO3 (SZ) nuclei within the amorphous diffusion zone with
vermicular features near the interface were observed after co-firing at 1400°C/1 h. The number of porosity at triple
phase boundary (TPB) decreases significantly with increasing co-firing conditions. The transition of secondary phase
changes from LZ to SZ with increasing co-firing temperature. The controlled reaction was confirmed to be the diffusion
of Mn cations. The activation energy of Mn diffusion was 78 kJ/mol, close to that (111 kJ/mol) of rate constant.
Moreover, the diffusion of cations (mainly Mn) from LSM to YSZ also enhances the grain growth of YSZ. The
formation of pore-free zone (PFZ) of YSZ next to LSM was found and could be induced by vacancy diffusion
mechanism. No formation of secondary phase can be found after annealing at 1000°C/1000 h, implying the interface is stable without the formation of secondary phases at the operation temperatures (£ 1000°C).
Subjects
YSZ
LSM
SOFC
Reaction kinetics
Publisher
臺北市：國立臺灣大學材料科學與工程學研究所
Type
report
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