Abstract
A glass filler of 60Bi2O3-20B2O3-10SiO2-5ZnO-5Al2O3(mol%) was utilized to join 99Al2O3 ceramic and Al alloy 1060 at low temperature, which effectively addressed the negative impact caused by the indelible oxide film on the aluminum surface during the conventional process. Prior to the joining process, the surface morphology and thermophysical properties of the glass filler were investigated. Additionally, the wetting behavior of the glass on both the Al2O3 substrate and Al substrate was confirmed. Subsequently, the interfacial microstructure of the Al2O3/Al joints was analyzed in detail and the mechanical properties of the joints were evaluated under different temperatures and holding times. The shear strength of the joints reached a maximum value of 30.25 ± 1.0 MPa at 460 °C for 30 min. The precipitation and growth of the Bi24B2O39 phase improved the mechanical properties of the joints with increasing temperature and holding time. However, high temperatures and long holding times resulted in the precipitation of a large number of crystals in the joints, leading to embrittlement, which severely reduced the mechanical properties of the joints.
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