[en] Partially stabilized zirconia was vacuum furnace brazed to itself, to nodular cast iron, and to commercially pure titanium with a Ag-30Cu-10Sn wt% filler metal. Wetting was obtained by coating the ZrO₂ surfaces with Ti prior to brazing by RF sputtering or electron beam evaporation. Braze joints made with Ti-sputter-coated ZrO₂ contained high levels of porosity, but those made with Ti coatings deposited by evaporation, referred to as Ti-vapor-coated, contained little or no porosity. Brazing caused the ZrO₂ within about 1 mm (0.04 in.) of the joint surfaces to turn black in color, and thermodynamic analysis indicated that the discoloration was likely due to oxygen diffusion out of the ZrO₂ into the Ti vapor coating during brazing. Braze joint strength was determined by flexure testing in the four-point bend arrangement, and on a more limited basis, by shear testing. The latter method was used mainly as a screening test for ZrO₂-Fe and ZrO₂-Ti joints. Flexure testing of ZrO₂-ZrO₂ and ZrO₂-Fe braze joints was done at 25, 200, 400, and 575 C (77, 392, 752 and 1,067 F) in air. For flexure testing, average strengths of joint specimens decreased with increasing test temperature. The lower average strengths of ZrO₂-Fe specimens compared to those from ZrO₂-ZrO₂ joints was attributed to higher residual stresses in the ceramic-to-metal joints