What is difference alumina ceramic and zirconia ceramic?

Industrial ceramics have been widely used in many emerging fields due to their superior characteristics in recent years, among which alumina ceramics and zirconia ceramics are the most common.

Here are a few tips to help you know what difference between the alumina ceramic and zirconia ceramic.

Ceramic density comparison

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

Toughness comparison

The toughness of zirconia ceramics is 4 times that of alumina ceramics. At the same time, the free fall of zirconia from a height of one meter will only cause some gaps in the alumina to break. In terms of hardness, alumina ceramic coating is harder than zirconia ceramic coating.

Use comparison

Alumina ceramics are divided into high-purity type and common type. High-purity alumina ceramics, due to their sintering temperature as high as 1650-1990 ℃, transmission wavelength of 1 ~ 6μm, generally made into molten glass to replace platinum crucibles; use its light transmittance and alkali metal corrosion resistance used as a sodium lamp tube,alumina ceramic grinding media ; Can be used as an integrated circuit substrate and high-frequency insulating material in the electronics industry.


Zirconia ceramics have excellent properties such as high melting and boiling points, high hardness, insulators at room temperature, and conductivity at high temperatures. Pure ZrO2 is white, yellow or gray when it contains impurities, and it is not easy to separate.

Zirconia ceramics are widely used in the field of structural ceramics because of their high toughness, high bending strength, high wear resistance, excellent thermal insulation performance, and thermal expansion coefficient close to steel. Mainly include: Y-TZP grinding balls, nozzles, ball valve seats, zirconia molds, miniature fan shafts, optical fiber pins, optical fiber sleeves, drawing dies and cutting tools, clothing buttons, watch cases and watches Belts, bracelets and pendants, ball bearings, light golf clubs and other room temperature wear-resistant parts.

Surface finish comparison

The zirconia ceramic structure has a higher surface finish, which is mirror-like and extremely smooth. In addition, the toughness of the zirconia ceramic structure is excellent, which overcomes the inherent brittleness of the ceramic itself, has higher wear resistance, and greatly extends the service life of the product.

Ceramic friction coefficient comparison

The friction coefficient of zirconia ceramics is only 1/2 of that of alumina ceramics, while the friction coefficient of alumina ceramics is very low. In actual use, the elastic and hard friction are more important. The specific wear resistance of the material depends on the actual usage.

Density contrast

The density of the zirconia ceramic structure is higher than that of the alumina ceramic. The density of the alumina ceramic is 3.5, and the density of the zirconia ceramic structure is 6, and the texture is more delicate. After grinding, the surface finish is higher, up to ▽ Above 9, it is mirror-like, extremely smooth, and has a smaller friction coefficient.

Heat resistance comparison

The thermal insulation of zirconia ceramic coating is better than that of alumina ceramic coating. The temperature resistance of zirconia ceramic coating is 2500 degrees higher than that of alumina ceramic coating. Alumina ceramic coating pure white zirconia ceramic coating white slightly yellow.


The main products of Mingxing Ceramic include ceramic seal ring, ceramic shaft, alumina ceramic rod and discs, steatite ceramic insulator, etc. 



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