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This paper introduces a brazing process between Al_2O_3 ceramic and Invar alloy.Al_2O_3 can be brazed with Invar effectively.The interfacial structure of Al_2O_3/Invar joint can be expressed as:Invar/Ag(s,s)+Cu(s,s)+Fe_2Ti(zone Ⅰ)/Ag(s,s)+Cu(s,s)+Fe_2Ti+N