Ag-Au-Pd alloys, having a gradient in the concentration of the elements (called diffusion alloys), were investigated in order to find homogeneous alloys suitable for melt-processing of YBCO superconductor. Interface aspects between the superconductor and diffusion alloys and composition profiles of the diffusion alloys after melt texturing are presented. The results obtained with the diffusion alloy led to the development of new ternary homogeneous Ag-Au-Pd alloys of composition (at %) Ag-(18-23)Au-(2-10) Pd. The interface between homogeneous alloys and the YBCO superconductor after melt-processing was characterized and the resistivity-temperature curve obtained with electrical contacts on the metallic part of the composite is shown.