Forming and sintering methods of ZTA ceramic

Alumina ceramics have received widespread attention due to their high melting point, high hardness, excellent high temperature stability and low price. However, due to their low toughness, it is always easy to cause ceramic materials to be used in industrial, medical and living fields. The aura of destruction greatly limits the application of alumina ceramics.



Introducing zirconia into alumina ceramics, zirconia toughened alumina (ZTA) ceramics can be prepared. Zirconia can play the role of phase change toughening and microcrack toughening in alumina ceramics, toughening and strengthening alumina ceramics, thereby improving the toughness of alumina ceramics, so ZTA ceramics are very promising ceramic materials .


Forming of ZTA ceramics:


Molding will affect the density of the ZTA ceramic green body and the uniformity of its internal microstructure, and has a great impact on the densification of the ceramic during the sintering process and the various properties of the ceramic including the hardness after sintering. Powder molding can be divided into dry molding and wet molding. Dry forming also includes traditional dry pressing and isostatic pressing.



Sintering of ZTA ceramics:


There are various sintering methods for ZTA ceramics, including atmospheric sintering, hot pressing sintering, hot isostatic pressing sintering, microwave sintering, plasma sintering and so on. In addition, the integration of various sintering methods will also give rise to more sintering methods, such as continuous sintering and two-step sintering.

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