Research On The Structure Control And Properties Of The Composite Interface By Ti@Al₂O₃/Cu

As a kind of heterogeneous interface,the ceramic/metal interface exists widely in various fields such as electronic packaging materials,electrical contact materials and metal catalysts.However,the ceramic/metal system has poor interface wettability and weak interface bonding.To achieve a good interface combination between ceramic and metal,the problem of wetting should be solved.When improving the wettability,the interface structure and interfacial adhesion change greatly.Therefore,it is necessary to conduct in-depth research on the improvement process of ceramic/metal interface wettability and interface control methods in order to promote the development and application of ceramic/metal composite materials.In this experiment,the molten salt method was used to deposit Ti-based coatings with different thicknesses on the surface of alumina ceramic.Then,the copper melt was composited with alumina ceramic deposited with Ti coatings of different thicknesses under vacuum at a temperature of 1350°C for 60 minutes to prepare the Al₂O₃/Cu laminate samples with the composite interface.The effect of different process parameters of the molten salt reaction process on the thickness,microstructure and adhesion between the coating and alumina ceramic were investigated,and the optimum process parameters were obtained.The effect of Ti coating thickness on the microstructure and adhesion of Ti@Al₂O₃/Cu composite interface was investigated by mechanical properties test.The results show that:(1)With the deposition temperature being 800?,the holding time being 60min,and the Ti powder content being 9.8wt.%,the Ti coating is continuously dense,and the interface of alumina ceramic is well bonded.The maximum critical load is 100N.(2)With the deposition temperature being 800?,the holding time being 60min,the Ti powder content being 9.8wt.%,and the molar mass ratio of Ti to Cu being 1:1.The composition of the Ti-Cu composite coating is Ti₂O and complex oxide Cu₃Ti₃O.The coating and alumina ceramic is well bonded.The maximum critical load is 120N.(3)When the thickness of the Ti coating is small,the wettability between the ceramic and the metal cannot be effectively improved,and there is a wide crack defect at the Ti@Al₂O₃/Cu composite interface.As the thickness of the Ti coating increases,a large amount of Ti and metallic copper dissolve and diffuse each other to form a continuous dense reaction transition layer.There exist Ti₄Cu₂O phase and Ti₂O phase in the transition layer,and makes the Ti@Al₂O₃/Cu composite interface present a good metallurgical bond.(4)When the thickness of Ti coating is less than 5.32?m,the tensile strength of Ti@Al₂O₃/Cu composite interface enhance with the increase of Ti coating thickness.When the thickness of Ti coating is 5.32?m,the optimal tensile strength is 15.02MPa.When the thickness of Ti coating is more than 5.32?m,the tensile strength decrease with the increase of the Ti coating thickness.(5)When the thickness of the Ti coating is small,the tensile fracture mainly occurs at the Ti@Al₂O₃/Cu composite interface,and the fracture is straight.When the thickness of the Ti coating is too large,the tensile fracture is almost all in the alumina ceramic near the interface.When the thickness of the Ti coating is moderate,the interface reaction is sufficient,and the tensile fracture occurs in the alumina ceramic near the interface and part of the reaction transition layer.