in succession a low temperature first plateau p 1 notably allowing the indium to melt 170 u00b0 c for a length of time t 1 equal to 1 hour the maintenance of this plateau also making degassing possible a temperature ramp between 170 u00b0 c and 650 u00b0 c 4 hours in length a high temperature second plateau p 2 650 u00b0 c for a length of time t 2 equal to 2 hours and a gradual decrease in temperature a variant brazing cycle is illustrated in fig2 b specifically it will be noted that it is also possible to perform the brazing cycles with gradual increases and not strict plateaus it is also possible to employ intermediate plateaus in order to make it more likely that the parts to be brazed reach temperature equilibrium generally the four metal layers are deposited in succession without breaking vacuum between two successive depositions and the deposits their natures and thicknesses are identical on the two parts to be assembled by brazing for reasons of symmetry it not however being absolutely necessary for the layers to have equal thicknesses the thicknesses of indium and gold intended to form the final gold and indium joint layer may advantageously be in a ratio of 2 5 corresponding to a theoretical indium percentage indium indium gold of about 13 by weight and 20 by number of atoms the specifics of the gold indium composition and the brazing temperature length provide the brazed assembly with a higher melting point and debonding temperature and therefore in practice a higher maximum operating temperature than that obtained with.