Black ziconia sintered body and preparation method therefor and use thereof

A method of forming a powder for a black zirconia sintered body, the method comprising the following steps:

• S1, mixing a soluble zirconium salt and a soluble yttrium salt at a ratio and dissolving the zirconium salt and the yttrium salt in water to form a slurry, adding a coloring agent, and adjusting the pH of the slurry to 8 to 10 with ammonia water under stirring, wherein the molar ratio of the soluble zirconium salt, the soluble yttrium salt, and the coloring agent is 90 to 95:1 to 5:1 to 9;
• S2, subjecting the slurry to hydrothermal synthesis at 140 to 200° C. for 10 to 72 hours to form a resultant reaction solution;
• S3, washing the resultant reaction solution with water and drying to obtain a powder;
• S4, subjecting the powder to heat treatment at 800 to 1200° C. for 2 to 5 hours, and then grinding and dispersing the powder;
• and
• S5, granulating the dispersed particles to obtain the powder for a black zirconia sintered body.