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Enhanced Ag–Nb 2 O 5 /SiC wetting and brazing by SiC pre‐oxidation: Experiments and first‐principles study
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Abstract
This study investigates the effect of SiC pre‐oxidation on the air reactive wetting and brazing behavior of Ag–Nb
2
O
5
fillers. An obvious SiO
2
layer induced by the pre‐oxidation can improve the wettability of the Ag–Nb
2
O
5
/SiC system as the contact angle decreases from ∼75° to ∼25° with increasing Nb
2
O
5
content, accompanied by localized AgNbO
3
formation at the interface and the triple line. Moreover, the Nb
2
O
5
addition promotes a progressive growth of AgNbO
3
, transforming the interfacial structure from Ag/SiO
2
/SiC to Ag/AgNbO
3
/SiO
2
/SiC. An optimal Nb
2
O
5
content effectively reduces the direct Ag/SiO
2
contact while avoiding excessive AgNbO
3
formation and associated thermal stresses, resulting in a maximum shear strength at 4% Nb
2
O
5
. First‐principles calculations demonstrate that the AgNbO
3
/SiO
2
interface exhibits a higher bonding strength than the Ag/SiO
2
interface, showing a strong interfacial charge transfer between AgNbO
3
and SiO
2
, which is consistent with enhanced mechanical performance. The insights gained from SiC pre‐oxidation offer a potential pathway for advancing the air brazing of other non‐oxide ceramic systems.
Title: Enhanced Ag–Nb
2
O
5
/SiC wetting and brazing by SiC pre‐oxidation: Experiments and first‐principles study
Description:
Abstract
This study investigates the effect of SiC pre‐oxidation on the air reactive wetting and brazing behavior of Ag–Nb
2
O
5
fillers.
An obvious SiO
2
layer induced by the pre‐oxidation can improve the wettability of the Ag–Nb
2
O
5
/SiC system as the contact angle decreases from ∼75° to ∼25° with increasing Nb
2
O
5
content, accompanied by localized AgNbO
3
formation at the interface and the triple line.
Moreover, the Nb
2
O
5
addition promotes a progressive growth of AgNbO
3
, transforming the interfacial structure from Ag/SiO
2
/SiC to Ag/AgNbO
3
/SiO
2
/SiC.
An optimal Nb
2
O
5
content effectively reduces the direct Ag/SiO
2
contact while avoiding excessive AgNbO
3
formation and associated thermal stresses, resulting in a maximum shear strength at 4% Nb
2
O
5
.
First‐principles calculations demonstrate that the AgNbO
3
/SiO
2
interface exhibits a higher bonding strength than the Ag/SiO
2
interface, showing a strong interfacial charge transfer between AgNbO
3
and SiO
2
, which is consistent with enhanced mechanical performance.
The insights gained from SiC pre‐oxidation offer a potential pathway for advancing the air brazing of other non‐oxide ceramic systems.
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