Abstract
A novel composite filler alloy was developed by introducing Si 3N 4p (p = particles) into Ag–Cu–Ti filler alloy. The brazing of Si 3N 4 ceramics and TiAl intermetallics was carried out using this composite filler alloy. The typical interfacial microstructure of brazed joints was: TiAl/AlCu 2Ti reaction layer/Ag (s,s) + Al 4Cu 9 + Ti 5Si 3p + TiN p/TiN + Ti 5Si 3 reaction layer/Si 3N 4. Effects of Si 3N 4p content in composite filler alloy on the interfacial microstructure and joining properties were investigated. The distribution of Ti 5Si 3p and TiN p compounds in Ag-based solid solution led to the decrease of the mismatch of the coefficient of thermal expansion (CTE) and the Young's modulus between Si 3N 4 and TiAl substrate. The maximum shear strength of 115 MPa was obtained when 3 wt.% Si 3N 4p was added in the composite filler alloy. The fracture analysis showed that the addition of Si 3N 4p could improve the mechanical properties of the joint.
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