Sealing method between at least two elements (100, 102), comprising the following steps: producing at least one first sealing material (104, 212) on at least one face of a first element of said two elements; producing at least one second sealing material, different from the first sealing material (104, 212), on at least one face of a second element of said two elements; securing said two elements (100, 102) together by thermocompression of the sealing materials (104, 108, 212) against each other at a temperature Tc below melting temperatures of the first and second sealing materials (104, 108, 212), wherein the first and second sealing materials (104, 108, 212) are chosen such that they each have at least one phase able to react with the phase of the other sealing material by interdiffusion of components of the respective phases of the sealing materials (104, 108, 212) during the securing step, and such that during the securing step, the respective phases of the sealing materials (104, 108, 212) react together and form at least one another solid phase (110, 214) having a melting temperature that is higher than the temperature Tc, the method being characterized in that the first and/or second sealing material is an eutectic alloy obtained at least by implementing several successive depositions of materials (204, 206) intended to form the eutectic alloy, and at least one thermal treatment of said materials (204, 206) intended to form the eutectic alloy at a temperature below the respective melting temperatures of said materials (204, 206) intended to form the eutectic alloy, said successive depositions and thermal treatment being implemented before the securing of said two elements (100, 102) by thermocompression. producing at least one first sealing material (104, 212) on at least one face of a first element of said two elements; producing at least one second sealing material, different from the first sealing material (104, 212), on at least one face of a second element of said two elements; securing said two elements (100, 102) together by thermocompression of the sealing materials (104, 108, 212) against each other at a temperature Tc below melting temperatures of the first and second sealing materials (104, 108, 212), wherein the first and second sealing materials (104, 108, 212) are chosen such that they each have at least one phase able to react with the phase of the other sealing material by interdiffusion of components of the respective phases of the sealing materials (104, 108, 212) during the securing step, and such that during the securing step, the respective phases of the sealing materials (104, 108, 212) react together and form at least one another solid phase (110, 214) having a melting temperature that is higher than the temperature Tc, the method being characterized in that the first and/or second sealing material is an eutectic alloy obtained at least by implementing several successive depositions of materials (204, 206) intended to form the eutectic alloy, and at least one thermal treatment of said materials (204, 206) intended to form the eutectic alloy at a temperature below the respective melting temperatures of said materials (204, 206) intended to form the eutectic alloy, said successive depositions and thermal treatment being implemented before the securing of said two elements (100, 102) by thermocompression.