Comparison Of Performance Between Zirconia And Alumina

Comparison Of Performance Between Zirconia And Alumina

Zirconia ceramics are famous for their excellent crack growth resistance and high thermal expansion coefficient, and are often used to manufacture metallized ceramic products. This material not only has the dual 

advantages of low thermal conductivity and high strength, but also has a wide range of applications, such as wire forming dies, welding auxiliary materials, and applications in high-temperature insulating rings.

There are essential differences in atomic bonding between ceramics and metal materials: ceramics are bonded by covalent bonds and ionic bonds, while metals are bonded by metal bonds. This leads to high resistance 

to shear stress and high hardness of ceramics at room temperature, but at the same time it also shows great brittleness. Because ceramic crystals are composed of cations, anions and chemical bonds, the directionality 

and atomic spacing of chemical bonds are large, which makes ceramics a difficult material to process. Therefore, it is very important for the ceramic industry to develop efficient and low-cost processing technology.

In recent years, industrial ceramics have developed rapidly in many fields because of their excellent properties, especially zirconia and alumina ceramics. Enterprises can refer to the following characteristics when 

choosing:

1、Density:   The density of zirconia ceramics is twice that of alumina ceramics, which provides better compression resistance.

2、Consistency:   The structural parts of zirconia ceramics have higher density, the density is 6, while that of alumina ceramics is 3.5, which makes the texture of zirconia ceramics more delicate, and the surface finish can reach more than 

9 after grinding.

3、Surface smoothness:  The surface smoothness of zirconia ceramics is higher, mirror-like and smooth, reducing friction, prolonging service life and reducing energy consumption.

4、Toughness:  The toughness of zirconia is four times that of alumina ceramics. Even if it falls from a height of one meter, zirconia ceramics will only have gaps, while alumina ceramics may break.

These characteristics make zirconia ceramics have obvious advantages in wear resistance, service life and product quality, and are an ideal choice for industrial applications.