Zirconia Ceramics vs. Alumina Ceramics

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Zirconia ceramics is a material with high resistance to crack propagation. It has a high coefficient of thermal expansion, so it is often used to make metalized ceramics. Zirconia is an excellent ceramic material that combines the outstanding properties of low thermal conductivity and high strength. It is widely used as a mold for wire forming, as an auxiliary material in the welding process, and it is often ideal for insulating rings in high-temperature service environments.

Atoms of ceramic materials are combined by covalent bonds and ionic bonds, while metal materials are combined by metal bonds, so ceramic materials and metal materials have completely different properties. Ceramic materials have great deformation resistance to shear stress at room temperature and have high hardness. Since ceramic crystals are composed of cations and anions and the chemical bonds between them, the chemical bonds are directional, the atomic packing density is low, and the interatomic distance is large, so that the ceramics show great brittleness. And there are many defects in processing, so it is a typical difficult-to-process material. It is very important to develop high-efficiency and low-cost processing technologies.

Today, the ceramics industry in all walks of life has been developing rapidly, industrial ceramics with its superior characteristics in recent years has been widely used in many fields, especially zirconia ceramics and alumina ceramics. Today we will compare these two materials.

1. Density

The density of zirconia ceramics is twice that of alumina ceramics, and zirconia has better compression resistance.

2. Surface finish

The surface finish of zirconia structural parts is higher, it is mirror-like, smooth, and the friction between it and the net is smaller, which can further improve the service life of the net, reduce the power consumption of the net, the current of the paper net, and the power consumption. In addition, the toughness of zirconia ceramics is good, which overcomes the inherent brittleness of ceramics, has higher wear resistance, greatly prolongs the service life of products, and significantly improves the quality.

3. Toughness

The toughness of zirconia ceramics is 4 times that of alumina ceramics. If it falls freely from a height of one meter at the same time, the zirconia ceramics will only have some gaps, and the aluminum dioxide will shatter.

4. Friction coefficient

The friction coefficient of zirconia ceramics is only 1/2 of that of alumina ceramics, and the friction coefficient of alumina ceramics itself is very low. In actual use, elastic wear and hard wear should be considered. The specific kind of material can be wear-resistant depending on the actual use.

In conclusion

In general, zirconia ceramics have the advantages of high hardness, good wear resistance, high toughness, low friction coefficient and good corrosion resistance. Due to its good properties, zirconia ceramic structural parts have received more and more attention.

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