INTERACTION OF OXIDE FILM WITH MOLTEN FLUX DURING ALUMINUM BRAZING

The interaction of oxide film with molten flux during aluminum brazing has been studied bymeans of X-ray powder diffraction. The following conclusions have been deduced: The swell-ing of aluminum oxide film is caused by Li~+ inserting into the vacancies of octahedral ortetrahedral structure of 0 atom skeleton in у-Al_2O_3 . The strength of oxide film decreases asthe crytallinity increases by the treating of flux containing LiF.