Zirconia toughened alumina (ZTA or Zirconia alumina) a combination of zirconia and alumina, is part of a class of composite ceramics called AZ composites.

The alumina has high hardness and zirconia has good toughness. The two materials form an excellent composite with high strength and high toughness, and its application is more extensive. With higher flexural strength and fracture toughness at room temperature, zirconia toughened ceramics have excellent wear resistance. The specific ratio of the two materials can be adjusted according to the user's actual application requirements,. The performance of zirconia toughened alumina ceramics is better than that of 99 alumina ceramics, and the cost is much lower than that of zirconia ceramics. Widely used in machinery, electronics, petroleum, chemical, aerospace and textile industries.