Interfacial morphologies between NiO-YSZ fuel electrode/316 stainless steel as the interconnect material and B-Ni3 brazing alloy in a solid oxide fuel cell system

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作者：
Lee, Sungkyu [1 ,2 ]
Kang, Kyoung-Hoon [1 ]
Hong, Hyun Seon [1 ]
Yun, Yongseung [1 ]
Ahn, Jae-Hwan [2 ]
机构：
[1] Plant Engineering Center, Institute for Advanced Engineering, 633-2 Goan-ri, Baegam-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do, 449-863, Korea, Republic of
[2] Division of Chemical and Materials Engineering, Ajou University, 5 Wonchon, Youngtong, Suwon, 443-749, Korea, Republic of
来源：
Journal of Alloys and Compounds | 2009年 / 488卷 / 01期
关键词：
Joining of NiO-YSZ cermet with 316 stainless steel was carried out using B-Ni3 brazing alloy (4.5 wt% Si; 3.2; wt%; B; 0.06; C; 0.02; P; Ni-balance; m.p. 982-1038 °C) to realize reliable sealing of the NiO-YSZ cermet anode/316 stainless steel interconnect structure in a SOFC. In the present research; interfacial (chemical) reactions during brazing at the NiO-YSZ/316 stainless steel interconnect were promoted by either of the two processing methods; (a) addition of an electroless nickel-plate to NiO-YSZ cermet as a coating or (b) deposition of titanium layer onto NiO-YSZ cermet by magnetron plasma sputtering method; with relevant process variables and procedures optimized during either of the pre-processing. Brazing was performed in a cold-wall vacuum furnace at 1080 °C under vacuum level of 10-3 Torr. Post-brazing examination of interfacial morphologies between NiO-YSZ cermet and 316 stainless steel was made using SEM and EDS. The results indicate that B-Ni3 brazing filler alloy was fused fully during brazing and continuous interfacial layer formation significantly depended on the method of pre-coating NiO-YSZ cermet. The inter-diffusion of elements was possibly promoted by titanium-deposition which reduced the diffusion reaction thickness of the interfacial area to less than 16 μm compared to 180 μm for electroless nickel-deposited NiO-YSZ cermet. © 2009 Elsevier B.V. All rights reserved;
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