Interfacial Microstructure and Formation Mechanism of Zirconia Ceramic and Nb Brazed with Ag-Cu-Ti Powder without and with Mo-Particle-Reinforced

Abstract:

Zirconia (ZrO₂) ceramic and Nb were brazed using Ag-Cu-Ti powder without and with Mo-particle-reinforced. The effects of the brazing temperature, holding time and Mo content of the composite filler on the interfacial microstructures and joining mechanism of ZrO₂/Nb brazed joints were investigated. By increasing the brazing temperature and holding time, the thickness of Ti₃Cu₃O layer increased and the thickness of TiO layer decreased, while the total thickness of the reaction layers increased slightly with the sufficient interfacial reaction. Meanwhile, the blocky Ti-Cu compounds gradually accumulate and grow up in the brazing seam. The calculated Ti activity increased first and then decreased as the Mo content was increased from 5 to 40 wt%. When the Mo content was 5wt%, only single Ti₃Cu₃O reaction layers formed adjacent to the ceramic substrate. By increasing of Mo particles, TiO layer became thicker. When 40 wt% Mo particles were added to the composite filler, Mo particles aggregated into larger clumps damaged the shear strength of brazing joint.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 542-550
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.542
• Online since: February 2018
• Authors: Na Wang, D.P. Wang*, Zhen Wen Yang, Ying Wang
• Keywords: Ag-Cu-Ti+Mo Composite Filler, Formation Mechanism, Interfacial Microstructure, ZrO₂ Ceramic

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