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Ceramic Bearing Classification and advantages Reference

NOVEMBER 02, 2022
Ceramic Bearing Classification and advantages Reference

All ceramic bearings are resistant to magnetic and electrical insulation, wear and corrosion resistance, oil-free self-lubricating, high temperature and high temperature resistance, and can be used in extremely harsh environments and special working conditions. The ferrule and rolling element are made of zirconia (ZrO2) ceramic material, and the retainer is made of polytetrafluoroethylene (PTFE) as standard. Generally, glass fiber reinforced nylon 66 (RPA66-25) and special engineering plastic (PEEK, PI), stainless steel (AISISUS316), brass (Cu), etc.
Silicon nitride full ceramic bearing
The silicon nitride all-ceramic bearing ring and rolling element are made of silicon nitride (Si3N4) ceramic material, and the retainer is made of polytetrafluoroethylene (PTFE) as standard. RPA66-25, PEEK, PI, and phenolic clip can also be used. Cloth bakelite pipes, etc. Compared to ZrO2, the SiN4 all-ceramic bearing is suitable for higher speed and load capacity, as well as for higher ambient temperatures. At the same time, it can provide precision ceramic bearings for high-speed, high-precision and high-rigidity spindles with the highest manufacturing precision up to P4 to UP.
Full ball full ceramic bearing
Full-ball type all-ceramic bearing with a ball gap on one side, because of the cage-free design, it can load more ceramic balls than the standard structure bearing, thus improving its load capacity, and avoiding the limitation of cage material. It can achieve the corrosion resistance and temperature resistance of ceramic cage type full ceramic bearings. This series of bearings is not suitable for high speed. When installing, please pay attention to the notch surface to the end that does not bear the axial load.
Ceramic cage full ceramic bearing
The ceramic cage has the advantages of wear resistance, high strength, corrosion resistance and self-lubrication. The all-ceramic bearing made of ceramic cage can be used in harsh environments such as extremely strong corrosion, ultra-high temperature and high vacuum. Common ceramic materials are ZrO2, Si3N4 or SiC
Mixed ceramic ball bearing
Ceramic balls, especially silicon nitride balls, have low density, high hardness, low friction coefficient, wear resistance, self-lubrication and good rigidity. They are especially suitable for rolling elements of high speed, high precision and long life hybrid ceramic ball bearings (internal and external). The circle is metal). Generally, the inner and outer rings are made of bearing steel (GCr15) or stainless steel (AISI440C), and the ceramic balls are made of ZrO2, Si3N4, or SiC.

Advantages of ceramic bearings
When it comes to ceramics, the first thing that comes to mind is the tableware commonly used in the home. With the development of technology, the physical properties of ceramics are applied to all walks of life including the bearing industry. Here are some of the advantages of ceramic bearings!
First, since ceramics are hardly corrosive, ceramic rolling bearings are suitable for operation under harsh conditions filled with corrosive media.
Second, since the density of the ceramic rolling ball is lower than that of the steel, the weight is much lighter, so the centrifugal effect of the outer ring can be reduced by 40% when rotating, and the service life is greatly extended.
Third, ceramics are less affected by thermal expansion and contraction than steel. Therefore, when the clearance of the bearing is constant, the bearing can be allowed to work in an environment where the temperature difference changes drastically.
Fourth, since the modulus of elasticity of ceramics is higher than that of steel, it is not easily deformed when subjected to force, so it is advantageous to increase the working speed and achieve higher precision. ?
In summary, due to the many advantages of ceramic bearings in the application, the major imported bearing manufacturers such as: SKF bearings, NSK bearings, FAG bearings are involved in this field and launched corresponding products.