Abstract: Al2O3 ceramic and 304 stainless steel were brazed by Ag-Cu-Ti filler alloy. The effects of brazing temperature and holding time on the microstructure and mechanical properties of Al2O3 ceramic/304 stainless steel joint were investigated. The results indicate that the microstructure of the joint was Al2O3/Cu3Ti3O＋TiCu/Ag(s,s)＋Cu(s,s)＋TiCu/Cu0.8Fe0.2Ti/Fe-Cr/304. The shear strength of the joint reached 130.54 MPa when brazed at 900 ℃ and holding time of 10 min. Thickness of the Cu3Ti3O was 2.5 μm. When the temperature is low and the holding time is short, the Cu3Ti3O reaction layer is thin, resulting in weak bonding between Al2O3 ceramic and filler layer. With increase of temperature and holding time, the thickness of the Cu3Ti3O reaction layer is too thick, which weakens the plastic deformation ability of the joint. The thickness of Cu3Ti3O reaction layer is the key to affecting quality of the joint.
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2023, Vol. 37 
