Vacuum brazing of MgAl₂O₄ transparent ceramics with AgCuTi active filler metal

MgAl₂O₄ transparent ceramics were vacuum brazed with AgCuTi active filler metal foil under conditions of 880℃/10 min and 880℃/60 min, respectively. The workpieces were metallurgically bonded, and the shear strength of the resultant joints under two conditions was 52.4 MPa and 61.3 MPa, respectively. The microscopic analysis results show that a consecutive diffusion layer appeared near the ceramics substrate. On the basis of XRD measurement, the layer was mainly composed of CuAl₂O₄ and TiO phases. The brazed seam consisted of Cu(s, s), Ag(s, s) and TiO Phases.