Ceramic bearings are perfect for many applications where standard bearings are unable to operate or in instances where lubrication is an issue.
Renowned for their resistance to heat, ceramic materials have long been used for applications where temperatures exceed those of standard bearing steels. Applications requiring bearings to have insulating properties or applications such as ultra high vacuum where lubricants can’t be used will be ideal candidates for ceramic bearings.
Ceramic materials and hybrid ceramic materials have advantages of high strength, high temperature resistance, corrosion resistance and wear resistance compared to ordinary bearing steel materials. When the working environment is at 250 ° C, or even 450 ° C, the advantages of high temperature ceramic bearings will be revealed. Compared with steel balls, the thermal expansion coefficient of ceramic balls is very low, so high-temperature ceramic bearings have a lower clearance than other bearings, and the performance advantage is also more obvious at high speeds.
The shaft and bearing housing of the high temperature ceramic bearing must be matched to each other to improve the bearing life and work stability, and must be improved in load, temperature rise, roughness and centrifugal force. In the case of high-speed rotation, the friction between the cage and the rolling elements and the ferrules is heated, and the ordinary bearings cannot be satisfied. However, due to the loss of heat and frictional heat, high-temperature ceramic bearings have much lower temperature rise than all-steel bearings. The thermal expansion coefficient of ceramic materials is one-fourth that of steel, so the stability also satisfies the requirements of operation.
Ordinary steel bearings, its temperature is 120 ° C, it is a high temperature bearing, its temperature can only reach 180 ° C. Ceramic bearings are precisely because of the characteristics of ceramic materials, so compared to ordinary steel bearings, ceramics Ball bearings are suitable for high temperatures. High-temperature ceramic bearings are also widely used in high-speed machine tools, high-speed motors, metallurgy, aerospace, aerospace and other fields.
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