Abstract
A YSZ/Al2O3 layered structure was successfully reactive air brazed using AgCuO fillers. The interaction mechanism between the filler and ceramics was systemically analyzed. The effects of filler composition on the interfacial microstructure and joint properties were investigated. AgCuO fillers possessed good wettability on the YSZ and Al2O3 ceramics. Ag had diffused into the ceramic substrates, but the width of the diffusion layer at the YSZ interface (∼10 nm) was narrower than that at the Al2O3 substrate (∼20 nm). Further HRTEM observations confirmed interatomic bonding between the CuO and the ceramics. The lattice mismatches at the Al2O3/CuO and YSZ/CuO interfaces were 0.98% and 2.97%, respectively. The filler alloy composition had a major influence on the microstructure and shear strength. The CuO phase preferentially precipitated at the Al2O3 interface. Consequently, the continuous CuO and CuAl2O4 layers gradually formed at the Al2O3 interface with increasing CuO content in the filler. The maximum shear strength (∼45 MPa) was obtained when the composition was Ag-8mol%CuO.
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