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Title: Computational design of metal oxides to enhance the wetting and adhesion of silver-based brazes on yttria-stabilized-zirconia

Abstract

Ag-CuO is a broadly used reactive air brazing (RAB) system for effectively bonding ceramics and metal interfaces, especially for sealing yttria-stabilized zirconia (YSZ) to metals in solid-oxide fuel cells (SOFCs). To understand the superior performance of this braze, density functional theory (DFT) calculations were employed to investigate two mechanisms that can potentially increase the work of adhesion (Wadh) and hence reduce the wetting angle of Ag on YSZ. It was found while the formation of Ag–dissolved O clusters at the Ag-YSZ interface can promote wetting, a much greater wetting angle reduction comes from the formation of CuO interlayers between Ag and YSZ. Further, the Wadh of an Ag/CuO and CuO/YSZ interface was found to be significantly higher than that of an Ag/YSZ interface. Based on simulation obtained-insights into metal to oxide bond formation, a simple descriptor was developed to predict Ag/oxide interface energies, predict Ag/oxide Wadh, and search for potential oxide interlayers capable of promoting the wetting and adhesion of Ag on YSZ. Many simple metal oxides (single cation) were examined, however their W_adh with Ag was less than that of an Ag/CuO interface. Expanding the search to multi-cation oxides led to several promising candidates, such as CuAlO2, CuGaO2, andmore » Cu3TiO4; all of which are also stable in the reducing SOFC conditions. Finally, depending upon their solubility in molten Ag, these newly-identified oxides could either be pre-applied as wetting promoting interlayers or directly incorporated into Ag to form new reactive air brazes.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1674942
Alternate Identifier(s):
OSTI ID: 1582795
Grant/Contract Number:  
FE0023315
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 152; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metal/oxides interface; adhesion; brazing; computational materials design

Citation Formats

Phongpreecha, Thanaphong, Nicholas, Jason D., Bieler, Thomas R., and Qi, Yue. Computational design of metal oxides to enhance the wetting and adhesion of silver-based brazes on yttria-stabilized-zirconia. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.04.024.
Phongpreecha, Thanaphong, Nicholas, Jason D., Bieler, Thomas R., & Qi, Yue. Computational design of metal oxides to enhance the wetting and adhesion of silver-based brazes on yttria-stabilized-zirconia. United States. https://doi.org/10.1016/j.actamat.2018.04.024
Phongpreecha, Thanaphong, Nicholas, Jason D., Bieler, Thomas R., and Qi, Yue. Mon . "Computational design of metal oxides to enhance the wetting and adhesion of silver-based brazes on yttria-stabilized-zirconia". United States. https://doi.org/10.1016/j.actamat.2018.04.024. https://www.osti.gov/servlets/purl/1674942.
@article{osti_1674942,
title = {Computational design of metal oxides to enhance the wetting and adhesion of silver-based brazes on yttria-stabilized-zirconia},
author = {Phongpreecha, Thanaphong and Nicholas, Jason D. and Bieler, Thomas R. and Qi, Yue},
abstractNote = {Ag-CuO is a broadly used reactive air brazing (RAB) system for effectively bonding ceramics and metal interfaces, especially for sealing yttria-stabilized zirconia (YSZ) to metals in solid-oxide fuel cells (SOFCs). To understand the superior performance of this braze, density functional theory (DFT) calculations were employed to investigate two mechanisms that can potentially increase the work of adhesion (Wadh) and hence reduce the wetting angle of Ag on YSZ. It was found while the formation of Ag–dissolved O clusters at the Ag-YSZ interface can promote wetting, a much greater wetting angle reduction comes from the formation of CuO interlayers between Ag and YSZ. Further, the Wadh of an Ag/CuO and CuO/YSZ interface was found to be significantly higher than that of an Ag/YSZ interface. Based on simulation obtained-insights into metal to oxide bond formation, a simple descriptor was developed to predict Ag/oxide interface energies, predict Ag/oxide Wadh, and search for potential oxide interlayers capable of promoting the wetting and adhesion of Ag on YSZ. Many simple metal oxides (single cation) were examined, however their W_adh with Ag was less than that of an Ag/CuO interface. Expanding the search to multi-cation oxides led to several promising candidates, such as CuAlO2, CuGaO2, and Cu3TiO4; all of which are also stable in the reducing SOFC conditions. Finally, depending upon their solubility in molten Ag, these newly-identified oxides could either be pre-applied as wetting promoting interlayers or directly incorporated into Ag to form new reactive air brazes.},
doi = {10.1016/j.actamat.2018.04.024},
journal = {Acta Materialia},
number = ,
volume = 152,
place = {United States},
year = {Mon Apr 16 00:00:00 EDT 2018},
month = {Mon Apr 16 00:00:00 EDT 2018}
}

Journal Article:

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Cited by: 37 works
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Figures / Tables:

Table 1 Table 1: The average interface distance ($Δd$), work of adhesion ($𝑊$adh ), calculated wetting angles ($𝜃$cal ), and experimental ($𝜃$exp ) for Ni/YSZ interface and systems involved in Ag–CuO/YSZ braze.

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Works referencing / citing this record:

A review on recent status and challenges of yttria stabilized zirconia modification to lowering the temperature of solid oxide fuel cells operation
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.