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Fearless of electric corrosion damage, ceramic bearings are highly sought after!

10/24/2023 09:30:45

Ceramic bearings are a type of ceramic material that utilizes excellent insulation properties, and are a wonderful combination of new processes, materials, and structures in the bearing industry. By using a special process to make the entire bearing, the ceramic part of the bearing will block the passage of shaft current through the bearing, thereby endowing it with insulation characteristics. Ceramic bearings are divided into full ceramic bearings and hybrid ceramic bearings.


1. Ceramic bearings: stronger, lighter, faster


Hybrid ceramic bearings are generally made of ceramic materials for rolling elements, and bearing rings are made of bearing steel; Generally used in high-speed, insulation, lean oil lubrication, and other applications. All ceramic bearings are made of ceramic materials for both the rolling element and the ring; Generally used in high temperature, corrosion, anti magnetic, insulation and other occasions.


Comparison of characteristics between different ceramic materials and bearing steel

2. Zirconia ceramic bearings

Zirconia ceramic bearings


Zirconia ceramic bearings are white in color. The general practice is to use zirconia for the inner and outer rings and balls, PTFE for the cage (i.e. Teflon), or nylon. This combination can withstand temperatures up to 240 degrees Celsius. However, if the temperature resistance is required to exceed 240 degrees Celsius to 400 degrees Celsius, it is necessary to use zirconia to fill the ball (i.e., without the cage, the entire ball is made of zirconia), This way, it can withstand temperatures of around 400 degrees.


3. Silicon nitride ceramic bearings

Silicon nitride ceramic bearings


Silicon nitride ceramic bearings are black in color. The general practice is to use silicon nitride for the inner and outer rings and balls, PTFE (i.e. Teflon) for the cage, or nylon. If combined in this way, the temperature resistance should not exceed 240 degrees (because PTFE itself is nylon, the temperature resistance of the product with this material would not exceed 240 degrees).


But if the temperature resistance is required to be very high and exceed 400 degrees Celsius (zirconia full ball can be selected for temperatures between 240 degrees Celsius and 400 degrees Celsius), silicon nitride full ball should be selected, and the maximum temperature resistance of silicon nitride full ball can be 1200 degrees Celsius. Moreover, the corrosion resistance and wear resistance of silicon nitride are much better than those of zirconia, but the price of silicon nitride is relatively expensive, much higher than that of zirconia.


With the continuous progress of processing technology and the increasing level of technology, the cost of ceramic bearings continues to decrease,In the fields of aerospace, navigation, nuclear industry, petroleum, chemical industry, light textile industry, machinery, metallurgy, electricity, new energy, food, locomotives, subways, high-speed machine tools, and scientific research, national defense and military technology, it is necessary to work under special working conditions such as high temperature, high speed, deep cold, flammable, explosive, strong corrosion, real air, electrical insulation, non magnetic, dry friction, and easy to rust, The indispensable substitute role of ceramic bearings is gradually being recognized by people.


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