The invention provides a 3D printed
cobalt-
chromium alloy for
dental porcelain repair and a preparation method thereof, and belongs to the field of
dental porcelain repair. A
Ta element is added, so that the
thermal expansion coefficient is reduced, the
metal ceramic bonding strength is improved, the surface active energy is reduced,
solid solution strengthening is caused, and the strength is improved; the content of a
Cr element is increased, the content of a
Co element is reduced, the content of a hcp phase is increased,
metal and
ceramic bonding is facilitated, after the content of the
Co element is reduced, combination of Cr-W, Cr-Mo, Cr-Si and W-Mo is improved, and the strength of the
alloy is improved; vacuum
stress relief annealing is adopted, and
residual stress is completely eliminated, so that
microstructure phase change caused by the
residual stress in the
service process of a
cobalt-
chromium restoration is avoided, and micro-cracks are prevented from being formed on a
metal-
ceramic bonding interface; and
solid solution and aging are adopted, the composition of a
cobalt-
chromium alloy phase and
precipitation of a second phase are adjusted, so that the alloy has good mechanical properties, meanwhile, the hcp phase is further improved, and the metal-ceramic
bonding strength is improved.