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

 

(1) Color

 

More than 80% of zirconia ceramic ball is mainly white, white zirconia ceramic ball is its natural color. But sometimes when you see the ceramic balls turn yellowish or gray, it's because the zirconia material contains a small amount of impurities.

 

Zirconia ceramic ball has the advantages of high toughness, high flexural strength, high wear resistance, excellent heat insulation, thermal expansion coefficient close to steel ball, etc.

 

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

 

(2) Physical performance comparison

 

The physical properties of zirconia ceramic ball are excellent in wear resistance and corrosion resistance, and the silicon nitride ceramic ball also has the same excellent performance. At the same time, the silicon nitride ceramic ball also performs 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 have only begun to be popular. Because the ceramic ball relative to 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, it can play the role of high temperature resistance in high temperature environment. Therefore, ceramic balls appear in bearings and other ultra-precision machinery fields, such as guides, linear sliding accessories, etc., and have the tendency to replace steel balls.

 

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

Silicon nitride ceramic bearing and zirconia ceramic bearing, the biggest difference: the use of different ceramic materials.

 

Silicon nitride ceramic bearing is made of silicon nitride ceramic, which is an important structural ceramic material. It is a kind of superhard material, itself has lubricity, and wear resistance, for atomic crystal; Oxidation resistance at high temperature. And it can resist hot and cold shock, heating in the air to more than 1000 degrees Celsius, sharp cooling and sharp heating, will not shatter. Because of its excellent properties, silicon nitride ceramics are often used to manufacture mechanical components such as bearings, turbine blades, mechanical sealing rings and permanent molds.