Abstract
An Ag particle interlayer was adopted to join YSZ to Al2O3 ceramics in air directly. In comparison with the traditional Ag-CuO braze used in our previous work, the Ag particle interlayer prevented the formation of the brittle compound (CuAl2O4) layer along the ceramic interface. Sintering effect of particulate Ag and high-density dislocations in the interlayer are the major contributors to recrystallization of Ag and elemental interdiffusion. High Resolution Transmission Electron Microscope images confirmed that atomic bonding was achieved between the interlayer and Al2O3. Joining parameters, including temperatures and pressures, were optimized, resulting in the maximum shear strength of the joint (∼80 MPa) obtained at 950 °C/30 min with the external pressure of 0.9 MPa, which is 78 % higher than that of the joint brazed by Ag-CuO.
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