The invention provides a preparation method of dark-blue
zirconia ceramic. The method comprises following steps: step one, taking zirconia
powder as the base material, adding at least one component from following components:
cobalt ferrite,
cobalt oxide and
cobalt aluminate in the zirconia
powder as the coloring agent, and adding
polyvinyl alcohol water solution in the zirconia
powder as the binder; step two, putting the mixture of the
ceramic raw materials prepared in the step one into a ball-
grinding bottle to
grind until the mixture is homogenously mixed, pouring out the suspending liquid in the ball-
grinding bottle,
drying the suspending liquid to remove the water, and obtaining
ceramic powder; step three, pressing the
ceramic powder obtained in the step two into required ceramic bodies through the
dry pressing technology or the isostatic pressing technology; step four, putting the ceramic bodies obtained in the step three into a high-temperature
sintering furnace after slow glue discharging to sinter into products. The preparation method produces a dark-blue
zirconia ceramic, and the ceramic contains a coloring material. The coloring material can stably exist at the temperature of 1500 DEG C, furthermore, the coloring material not only can guarantee that zirconia is sintered into a completely compact state, but also makes the
zirconia ceramic have a dark-blue appearance.