Low temperature diffusion brazing of Al alloy heat pipe

For technical requirements of loop heat pipe and heat pipe applied outside connection on low temperature brazing and high temperature using during thermal radiation products,a new type of gallium-based low silver filler metals Ga60Cu38Ag2 was developed. The test resultsanalyzed by scanning electron microscope,DSC,XRD spectrum analysis showed that the elements Cu and Ga in the gallium-based brazing filler metal had formed CuGa₂,and a part of the Ga diffused to the Ag plating of aluminum alloy and forming Ag₃Ga intermediate compound with silver. A Part of the element Al is solid saluted in the coating,and a part formed AlAg₃ intermediate compounds with Ag. The shear strength of brazed joint can reach 18 MPa,and the solidus temperature of solder is 263 ℃,which satisfies the using demand of the expanded heat radiator.