Dual Atmosphere Isothermal Aging and Rapid Thermal Cycling of Ag-Ni and Ag-CuO Stainless Steel to Zirconia Braze Joints

Zhou, Quan; Bieler, Thomas R.; Nicholas, Jason D.

doi:10.1149/2.0911910jes

Title: Dual Atmosphere Isothermal Aging and Rapid Thermal Cycling of Ag-Ni and Ag-CuO Stainless Steel to Zirconia Braze Joints

Journal Article · 13 June 2019 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.0911910jes · OSTI ID:1526102

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Michigan State Univ., East Lansing, MI (United States)

Silver—copper oxide brazes are commonly used to bond zirconia to stainless steel (SS) for Solid Oxide Fuel Cell (SOFC) and other high temperature joining applications. In fact, conventional Ag-CuO compositions (where Cu segregates to the surface, oxidizes, and reduces the silver wetting angle on zirconia from ~85 to ~40°) allow brazing to be performed in air. Unfortunately, the relatively high ~40° wetting angles of these reactive air brazes, and the ability of SOFC anode gases to reduce the CuO in them, produce pores during SOFC manufacturing and operation that reduce joint strength, impermeability, and longevity. Recently, Ag brazes utilizing transient porous nickel layers, instead of CuO additions, have been shown to produce high quality braze joints between SS and yttria stabilized zirconia (YSZ). Here, the microstructural and compositional evolution of SS|Ag-3CuO|YSZ and SS|Ag-Ni|YSZ braze joints exposed to air on one side and humidified 4%H₂-96%N₂ on the other side for either ~300 hours of ~750°C aging or ~300 25°C/min 35–830°C rapid thermal cycles are compared. While both brazes display considerable microstructural and compositional evolution, only the Ag-Ni brazes remain pore free and well bonded, indicating that Ag-Ni brazes may be more suitable for long term SOFC operation.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)

Grant/Contract Number:: FE0023315

OSTI ID:: 1526102

Alternate ID(s):: OSTI ID: 1614200

Journal Information:: Journal of the Electrochemical Society, Vol. 166, Issue 10; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Dual Atmosphere Isothermal Aging and Rapid Thermal Cycling of Ag-Ni and Ag-CuO Stainless Steel to Zirconia Braze Joints

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