Microwave Joining Alumina Ceramics Using Al-Si Alloy Powders at Low Temperature

Abstract

Alumina composites were joined in air by microwave heating, along with Al-Si alloy powder as the interlayer. The interfacial microstructure and the fracture surface were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Element and phase components of the interlayer were analyzed by X-ray diffraction (XRD). Experimental results clearly indicated that microwave heating method effectively hampered the oxidation of the interlayer and indirectly promoted adhesion. The molten Al-Si alloy wetted and penetrated to the 95-Al2O3 ceramics surface, which formed the well joining interface.