Characteristics and molding methods of zirconia toughened alumina ceramics

Release time：2024-09-11click：0

Alumina ceramicsAs a type of structural ceramics, it has the advantages of extremely high hardness, wear resistance, strong corrosion resistance, and good high temperature stability. It is widely used in industrial production. , but the lower toughness of alumina limits its further application.
Zirconium oxide ceramic is a material with a high resistance to crack propagation. It has a high coefficient of expansion and is often used to make metallized ceramics. Zirconia toughened alumina (ZTA) ceramics can be produced by introducing zirconia (ZrO₂) into alumina (Al₂O₃) ceramics.

ZTA ceramics have high strength, high toughness and high hardness , high temperature resistance, corrosion resistance and stable chemical properties. It has broad application prospects in aerospace, aviation, engine wear-resistant parts, and cutting tools.
In view of the characteristics of ZTA ceramics, today we will focus on the molding process of ZTA ceramics:

ZTA ceramic molding process

1. Dry molding
Dry forming includes: traditional dry pressing forming and isostatic pressing.
Traditional dry pressing molding can turn the powder into a lower density green body and can also crush the soft agglomeration between powders. However, isostatic pressing molding (commonly used is cold isostatic pressing) uses liquid as the pressure transmission medium. , the green body can be pressed more evenly. Cold isostatic pressing is mainly to obtain a greater density of the green body, so that the green body can be re-shaped under high pressure to obtain a green body with high density, small pores and good uniformity. .
Generally speaking, dry molding is widely used for simple ceramic parts. Due to its simple operation, it can be suitable for large-scale industrial production. However, it is difficult to completely eliminate the agglomeration behavior of powders when preparing ceramics by dry pressing molding, which will inevitably affect the performance of the final ceramic products to a certain extent.

2. Wet molding
The wet molding process is more complicated than dry molding, and the drying of the main body and the debinding process before sintering are problems that must be solved in wet molding. Although wet molding solves the problem of agglomeration in powder molding to a certain extent, it also causes problems such as glue discharge and difficulty in large-scale industrial production.

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