Applicative Study of CuNi30 Material in Vacuum Interrupter
In this paper,the application feasibility of CuNi30 material in vacuum interrupter is studied.The physical and chemical properties,surface cleaning properties,flow wetting properties of brazing metal,sealing tensile properties and whole tube assembly of CuNi30,oxygen-free copper and stainless steel were tested.The results show that the tensile strength of CuNi30 is between that of stainless steel and oxygen-free copper,and the tensile strength and elongation of CuNi30 have little change before and after high temperature treatment,while the hardness decreases slightly.Under the general brazing standard,the CuNi30 material can be directly sealed with the metallized porcelain shell,and its sealing strength is better than that of the oxygen-free copper transition structure used in stainless steel.Group A tests(vibration test,alternating damp heat test and salt spray test show that the assembled interrupter can meet the needs of the vacuum interrupter.