Preparation method of gray zirconia ceramic and gray zirconia ceramic

The invention relates to a preparation method of gray zirconia ceramic, which comprises the following steps: S1, adding a ceramic base material and a dispersing agent into pure water to obtain primary slurry, and grinding the primary slurry to obtain primary slurry; s2, stirring the primary slurry, adding a coloring agent, then adding an alkaline solution, and adjusting the pH value to 7-10 to obtain secondary slurry; s3, sequentially adding a plasticizer and a lubricant into the obtained second-stage slurry to prepare third-stage slurry; s4, sequentially carrying out spray granulation, compression molding, glue discharging treatment and sintering treatment on the obtained third-stage slurry to obtain gray zirconia ceramic; the sintering treatment is carried out in a weak reducing atmosphere. The invention also relates to gray zirconia ceramic. The gray zirconia ceramic can be molded in a temperature range suitable for zirconia ceramic sintering, has better physical properties and can present a gray tone; and