The main differences between zirconia ceramic ball bearings and silicon nitride ceramic ball bearings are as follows:

 

 

 

(1) Color

 

 

 

More than 80% of zirconia ceramic ball is white, white zirconia ceramic ball is its natural color. But sometimes you see the pale yellow or gray color of the ceramic spheres because the zirconia material contains a small amount of impurities.

 

 

 

Zirconia ceramic ball has the advantages of high toughness, high bending strength and high wear resistance, excellent heat insulation performance, thermal expansion coefficient close to the steel ball and so on.

 

 

 

And silicon nitride ceramic ball with carbon black color, it is very high temperature resistance, strength can be maintained to 1200℃ high temperature without falling, after heating will not melt into melt, is one of the world's hardest material materials.

 

 

 

(2) Comparison of physical properties

 

 

 

In terms of physical properties, zirconia ceramic balls are excellent in wear resistance and corrosion resistance, while silicon nitride ceramic balls also have the same excellent performance. At the same time, silicon nitride ceramic balls also perform well in processing accuracy.

 

 

 

Therefore, in the application field of high precision machinery industry, such as ultra-precision bearings, in addition to the steel ball has been widely used, ceramic balls in precision bearings only began to be popular. Because the ceramic ball relative to the bearing steel ball has the characteristics of corrosion and rust prevention, and the processing accuracy is even higher than the steel ball.

 

 

 

At the same time, can play the role of high temperature resistance in high temperature environment. Therefore, the ceramic ball in bearings and other ultra-precision machinery, such as guide rail, linear sliding accessories and other aspects of its figure, and has a trend to replace the steel ball.

 

 

 

Two, silicon nitride ceramic bearings and zirconia ceramic bearings, the biggest difference

 

The biggest difference between silicon nitride ceramic bearings and zirconia ceramic bearings is that the ceramic materials used are different.

 

 

 

Silicon nitride ceramic bearings are made of silicon nitride ceramics, which is an important structural ceramic material. It is a kind of super hard material, itself has lubricity, and wear resistance, for atomic crystal; Oxidation resistance at high temperatures. And it can also resist cold and hot shock, heated to more than 1000℃ in the air, sharp cooling and then sharp heating, will not break. Because silicon nitride ceramics have such excellent characteristics, people often use it to manufacture bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components.