What are the types of ceramic bearings? What are the characteristics and applications

1, according to the use of points:

(1), high-speed bearings:

Ceramic bearings have the cold resistance, small elasticity of force, pressure resistance, poor thermal conductivity, light weight, friction coefficient, etc., can be applied to 12000 rpm-75000 rpm high-speed spindle and other high-precision equipment;

(2), high-temperature bearings: the materials themselves The material itself has a high temperature resistance of 1200 ℃, and good self-lubrication, the use of temperature in the 100 ℃ -800 ℃ does not produce the expansion caused by temperature differences. Can be used in furnaces and kilns, plastic, steel and other high-temperature equipment;

(3), corrosion-resistant bearings: the material itself has corrosion-resistant properties, can be used in strong acid, strong alkali, inorganic, organic salts, seawater and other fields, such as: electroplating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment, etc..

(4), anti-magnetic bearings: due to the non-magnetic non-absorbent dust, can reduce the bearing early spalling, noise and so on. Available in demagnetization equipment. Precision instruments and other fields.

(5), electrical insulation bearings: due to high resistance, can avoid arc damage bearing, available in a variety of insulation requirements of electric equipment.

(6), vacuum bearings: because of the unique oil-free self-lubricating ceramic materials, in the ultra-high vacuum environment, can overcome the ordinary bearings can not realize the lubrication problem. Note: the above five categories of bearings, the same set of bearings can be applied to high temperature, high speed, acid and alkali, magnetic field, non-insulation, but because of the material properties are different (see rare earth ceramic material properties table), so please customers to choose the product, according to their own application occasions, to select the most suitable material ceramic bearings.

2, according to the material: zirconia full ceramic bearings

All ceramic bearings with anti-magnetic insulation, wear-resistant corrosion-resistant, oil-free self-lubrication, resistance to high temperatures, high temperature and cold, etc., can be used in extremely harsh environments and special working conditions. The ring and rolling body are made of zirconia (ZrO2) ceramic material, and the keeper is made of polytetrafluoroethylene (PTFE) as the standard configuration, and glass fiber reinforced nylon 66 (RPA66-25), special engineering plastics (PEEK, PI), stainless steel (AISISUS316), and brass (Cu) can also be used.

Silicon Nitride Full Ceramic Bearing

Silicon Nitride Full Ceramic Bearing rings and rolling body using silicon nitride (Si3N4) ceramic material, keeper using polytetrafluoroethylene (PTFE) as standard, generally can also use RPA66-25, PEEK, PI, and phenolic sandwich wood tube, etc. SiN4 full ceramic bearings can be compared to ZrO2 material. Compared with ZrO2 material, SiN4 full ceramic bearings are suitable for higher speeds and loads, as well as for higher ambient temperatures. Precision ceramic bearings for high-speed, high-precision, high-rigidity spindles are also available, with the highest manufacturing accuracy of P4 to UP grade.

Full Ball Full Ceramic Bearings

Full Ball Full Ceramic Bearings are equipped with a ball notch on one side, and because of the cage-less design, they can be loaded with more ceramic balls than standard bearings, thus increasing their load capacity, and also avoiding the limitations of cage materials, and achieving the effect of corrosion and temperature resistance of ceramic cage type full ceramic bearings. This series of bearings is not suitable for higher speeds, installation should pay attention to the notched surface mounted on the end that does not bear axial load.

Ceramic cage full ceramic bearings

Ceramic cage with wear resistance, high strength, corrosion resistance and self-lubricating advantages, the use of ceramic cage manufacturing full ceramic bearings can be used in extremely strong corrosion, ultra-high and low temperatures, and high vacuum and other harsh environments. Commonly used ceramic materials for ZrO2, Si3N4 or SiC.

Mixed ceramic ball bearings

Ceramic ball, especially silicon nitride ball with low density, high hardness, low coefficient of friction, wear-resistant, self-lubricating and rigidity and other characteristics, especially suitable for high-speed, high-precision and long-life mixed ceramic ball bearings rolling body (inner and outer ring is metal). Generally the inner and outer rings are made of bearing steel (GCr15) or stainless steel (AISI440C), and the ceramic balls can be made of ZrO2, Si3N4, or SiC materials.

3, according to the technical grade:

(1), deep groove ball bearings ceramic bearings

Ceramic Bearing Atlas

bearings (technical grade: P4, P5, P6, P0) deep groove ball bearings, the most representative of the rolling bearings, a wide range of uses, can withstand radial loads and bi-directional axial load. Suitable for high-speed rotation and the requirements of low noise, low vibration occasions or steel bearings can not be applied to high temperature, high temperature, corrosion, magnetic field, non-insulated and other fields.

(2), self-aligning ball bearings self-aligning ball bearings outer raceway is spherical, self-aligning, can supplement the error caused by different heart and shaft deflection. Used to produce shaft and shell of different heart or shaft deflection parts and high temperature, low cold, corrosion, magnetic field non-insulation and other requirements of the centering parts. Note: The tilt cannot exceed 3 degrees.

(3), single-row angular contact ball bearings (technical grade: P4, P5, P6, P0) Angular contact bearings are suitable for high-speed and high-precision rotation, in high temperature, magnetic field, water, etc. does not affect its accuracy, and can withstand synthetic load. Standard contact angle of 15 °, 30 ° and 40 °, the larger the contact angle of the axial load capacity, the smaller the contact angle bearings can withstand radial load and one-way axial load. Generally, they are mounted in pairs. Please pay attention to the purchase.

(4), unidirectional thrust ball bearing unidirectional thrust ball bearing, is a washer-shaped ring with ball rolling path and assembled with the ball cage composition. Can bear axial load, but can not bear radial load.