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Journal of Advanced Ceramics 2024, 13(2): 135-142 https://doi.org/10.26599/JAC.2024.9220857
Research Article | Open Access | Issue | Published: 06 February 2024

Reactive air wetting and brazing of Al2O3 ceramics using Ag–Nb2O5 filler: Performance and interfacial behavior

Show Author's Information Yudi Qiu1,  Shunjian Xu2,  Xiangzhao Zhang1( ),  Mingfen Zhang1,  Qinhan Guo1,  Beiji Wang1,  Guanjun Qiao1,  Guiwu Liu1( )
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
School of Intelligent Manufacturing, Huzhou College, Huzhou 313000, China
Keywords:
microstructure, first-principles calculations, wettability, shear strength, reactive air brazing (RAB)
Cite this article:
Qiu Y, Xu S, Zhang X, et al. Reactive air wetting and brazing of Al2O3 ceramics using Ag–Nb2O5 filler: Performance and interfacial behavior. Journal of Advanced Ceramics, 2024, 13(2): 135-142. https://doi.org/10.26599/JAC.2024.9220857
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Abstract Full text Electronic supplementary material About this article

We firstly performed the reactive air wetting and brazing of Al2O3 ceramics using Ag–(0.5‒12)Nb2O5 fillers, where Nb2O5 can react with liquid Ag and O2 from air to generate AgNbO3. The contact angle of the Ag–Nb2O5/Al2O3 system almost linearly decreases from ~71.6° to 32.5° with the Nb2O5 content increasing, and the joint shear strength reaches the maximum of ~65.1 MPa while employing the Ag–4Nb2O5 filler, which are mainly related to the formation and distribution of the AgNbO3 phase at the interface. Moreover, the interfacial bonding and electronic properties of related interfaces were investigated by first-principles calculations. The calculated works of adhesion (Wa) of Ag(111)/Ag–O–AgNbO3(001) and AgNbO3(001)/Al2O3(100) interfaces are higher than that of the Ag(111)/Al2O3(110) interface, indicating good reliability of the Ag/AgNbO3/Al2O3 structure. The relatively large interfacial charge transfer indicates the formation of Ag–Ag, Al–O, and Ag–O bonds in the Ag/AgNbO3/Al2O3 structure, which can contribute to the interfacial bonding.


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About this article

Reactive air wetting and brazing of Al2O3 ceramics using Ag–Nb2O5 filler: Performance and interfacial behavior

Show Author's information Yudi Qiu1, Shunjian Xu2, Xiangzhao Zhang1( ), Mingfen Zhang1, Qinhan Guo1, Beiji Wang1, Guanjun Qiao1, Guiwu Liu1( )
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
School of Intelligent Manufacturing, Huzhou College, Huzhou 313000, China

Abstract

We firstly performed the reactive air wetting and brazing of Al2O3 ceramics using Ag–(0.5‒12)Nb2O5 fillers, where Nb2O5 can react with liquid Ag and O2 from air to generate AgNbO3. The contact angle of the Ag–Nb2O5/Al2O3 system almost linearly decreases from ~71.6° to 32.5° with the Nb2O5 content increasing, and the joint shear strength reaches the maximum of ~65.1 MPa while employing the Ag–4Nb2O5 filler, which are mainly related to the formation and distribution of the AgNbO3 phase at the interface. Moreover, the interfacial bonding and electronic properties of related interfaces were investigated by first-principles calculations. The calculated works of adhesion (Wa) of Ag(111)/Ag–O–AgNbO3(001) and AgNbO3(001)/Al2O3(100) interfaces are higher than that of the Ag(111)/Al2O3(110) interface, indicating good reliability of the Ag/AgNbO3/Al2O3 structure. The relatively large interfacial charge transfer indicates the formation of Ag–Ag, Al–O, and Ag–O bonds in the Ag/AgNbO3/Al2O3 structure, which can contribute to the interfacial bonding.

Keywords: microstructure, first-principles calculations, wettability, shear strength, reactive air brazing (RAB)

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Publication history

Received: 13 December 2023
Revised: 17 January 2024
Accepted: 25 January 2024
Published: 06 February 2024
Issue date: February 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This work is supported by National Natural Science Foundation of China (Nos. 52002153 and 51572112), Postdoctoral Science Foundation of China (No. 2021M701470), Qing Lan Project [(2016) 15] of Jiangsu Province, and Innovation/Entrepreneurship Program (No. JSSCTD202146) of Jiangsu Province.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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