Brasagem de AI2O3/FeNiCo utilizando como metal de adição uma liga AgCuTi obtida por solidificação rápida.

Abstract

In this work a rapidly solidified ribbon of AgCuTi was developed to be used as filler metal in ceramic/metal joining using active brazing metal process. The ribbons, with thickness of approximately 100 pm and width of 3 mm, was obtained by using the melt spinning technique and characterized for structural investigation by X-Ray and scanning electron microscopy (SEM). To evaluate the influence of the ceramic surface, the brazing was done using as sintered, sanded and polished ceramic surfaces. The samples were brazed in high vacuum furnace. The microchemical and structural analysis of the samples was accomplished by optical microscopy (OM) and SEM in the interface Al203/AgCuTi/FcNiCo. It was not detected any fails of lack of union between the base materials and filler metal for all of kind of surface, what indicates a good adherence. Besides, the analysis of the ribbon obtained by RS presented a more refined and distributed microstructure when compared with ribbon obtained by conventional process.