Will high speed ceramic bearings emit light when they rotate?

The application fields of high speed ceramic bearings are becoming more and more extensive, but ceramic ball bearings are successfully used in the industrial field.
At present, silicon nitride high speed ceramic bearings are the most widely used bearings. Its advantages are: high limit speed, good accuracy retention, small starting torque, high rigidity, good dry running performance and long life. It is very suitable for maintaining high precision and long-term operation under high speed, high temperature, corrosion and radiation conditions.

High speed ceramic bearings are mainly used in CNC machine tools and high-speed precision machinery, such as high-speed electric spindle bearings, machine tool spindle bearings, dental drill bearings, bearings for instrumentation, and computer hard disk drive bearings. In addition, the hardness of silicon nitride ceramic is twice that of bearing steel, and the elastic modulus is about 1/3 higher. Under the same load condition, the elastic deformation of silicon nitride ceramic is small. Therefore, the machine tool spindle using high speed ceramic bearings Has good running accuracy.

Hybrid high speed ceramic bearings have been successfully applied to the spindle of high-speed machine tools, and have entered the practical stage, such as the HP type ultra-precision lathe produced by Japan's Makino and other companies, the spindle speed is 16000 r/min, while the United States MIKRO The HSM700 high-speed machining center produced by the company has a spindle speed of 42000 r/min and a cutting speed that has increased by 5 to 10  times. In addition, hybrid ceramic bearings should also be used in high-speed equipment such as electric spindles and vortex molecular pumps.

As an important mechanical basic part, high speed ceramic bearings dominate the world of new materials due to their excellent performance unmatched by metal bearings, high temperature resistance and super strength.
In the past ten years, high speed ceramic bearings have been widely used in various fields of national economy and people's livelihood. Aerospace, navigation, nuclear industry, petroleum, chemical, textile industry, machinery, metallurgy, electric power, food, locomotives, subways, high-speed machine tools, scientific research and defense military technology and other fields require high temperature, high speed, cryogenic, flammable, easy Working under special working conditions such as explosion, strong corrosion, vacuum, electrical insulation, non-magnetic, dry friction, etc., the indispensable replacement role of high speed ceramic bearings is gradually being recognized.

With the continuous progress of processing technology and the increasing level of craftsmanship, the cost of high speed ceramic bearings has continued to decline. From the past, they have been applied only in a small range of high, precise and cutting-edge fields, and gradually promoted to various industrial fields of the national economy. The market price is gradually approaching practicality, reaching a level acceptable to users, and a wave of large-area applications of high speed ceramic bearings has surged.

This is a full ceramic zirconia bearing (model should be 61804). The bearing in the picture is not greased. The visual "glow" is the continuous spark produced by the collision between the ceramic ball and the inner and outer rings during high-speed rotation. The collision of zirconia ceramics produces cremation.

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