Ceramic bearings and strengths

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Ceramic bearings and strengths

Source: China Bearing Network Time: 2018-01-05

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Ceramic bearing terminology: zirconia all-ceramic bearing all-ceramic bearing with anti-magnetic electrical insulation, wear-resistant corrosion resistance, oil-free self-smooth, high temperature resistance and high cold resistance; can be used in extremely harsh environments and unique working conditions. Zirconium oxide (ZrO2) ceramic materials are used for the rolling body; polytetrafluoroethylene (PTFE) is used as the standard equipment for the roller; glass fiber reinforced nylon 66 (RPA66-25); special engineering plastics (PEEK; PI); Stainless steel (AISISUS316); brass (Cu), etc.
Silicon nitride all-ceramic bearing silicon nitride all-ceramic bearing rings and rollovers are made of silicon nitride (Si3N4) ceramic materials; adherents are made of polytetrafluoroethylene (PTFE) as standard equipment; usually also can use RPA66-25; PEEK ;PI; and phenolic cloth bakelite tube, etc. SiN4 full ceramic bearing is more suitable for higher speed and load than ZrO2 data; and suitable for higher ambient temperature. Together with high precision and high rigidity spindle Fine ceramic bearings; the highest production accuracy is P4 to UP.
Full-filled ball all-ceramic bearing full-ball type all-ceramic bearing with a ball gap on one side; because of the choice of non-stick frame layout design; can load more ceramic balls than the standard layout of the bearing; then improve its load; other can also Prevent the restraint of the data by the frame; reach the ceramics to maintain the corrosion resistance and temperature resistance of the all-ceramic bearing. This series of bearings is not suitable for higher speed; the device should pay attention to the notch surface at the end that does not accept the axial load.
Ceramics adhere to the all-ceramic bearing ceramics. The frame has the advantages of wear resistance, high strength, corrosion resistance and self-smoothness. The all-ceramic bearing made of ceramic adhering frame can be used for extremely strong corrosion, ultra-high temperature and high vacuum. Harsh environment. Common ceramic materials are ZrO2, Si3N4 or SiC
Hybrid ceramic ball bearing? Ceramic ball is unique in that silicon nitride ball has low density, high hardness, low friction coefficient; wear resistance, self-smoothness and good rigidity; it is uniquely suitable for high-speed, high-precision and long-life hybrid ceramic ball bearings. Roller (metal inside the watch). Usually the inner ring is made of bearing steel (GCr15) or stainless steel (AISI440C); the ceramic ball can be ZrO2; Si3N4; or SiC data.
The strengths of ceramic bearings When it comes to ceramics, our first thought is the tableware commonly used at home; following the development of technology, the physical properties of ceramics are used in various industries including bearing occupations. Let us analyze the strengths of the ceramic bearings below!
Top of the list; because ceramics are not afraid of corrosion; so; ceramic rolling bearings are suitable for working under the harsh conditions of corrosive media.
Secondly; because the density of ceramic tumbling balls is lower than that of steel; the component is much lighter; thus, the centrifugal effect of the outer ring can be reduced by 40% during the transition;
Thirdly, the influence of thermal expansion and contraction of ceramics is better than that of steel.
Fourth; because the modulus of elasticity of ceramics is higher than that of steel; it is not easily deformed when subjected to force; thus it is beneficial to improve the working speed; and achieve higher precision.
In summary; because ceramic bearings have so many advantages in use; so the major imported bearing manufacturers such as: SKF bearings; NSK bearings; FAG bearings have touched this category and launched the corresponding products.
The advantages of ceramic bearing and all-steel bearing are explained:
These years; the research and development of ceramic bearings in the country and the table have achieved rich results and substantial development. They have been used in machine tools, chemical engineering, aerospace and other fields and have produced peculiar results.
Ceramic bearings have the following unique advantages over all-steel bearings:
1, the speed and speed can be high - can work under the condition that the dn value exceeds 3 million; and the slip, wear and heat can be reduced,
2, long life, wear resistance - the fatigue life of all ceramic bearings is expected to be 10-50 times longer than all steel bearings; hybrid ceramic bearings; lifespan is also 3-5 times higher than the life of all steel bearings ,
3, the required smoothness is small - the friction coefficient of ceramic materials is low; the oil bearing smooth ceramic bearing is used; in the case of smooth oil thinning or lean oil; its smoothness is still not lower than the traditional smoothing agent commonly used in steel bearings,
4, wear-resistant - because the ceramic materials are lazy data; it is more resistant to corrosion and wear,
5, the rigidity is large - because the ceramic material has a high modulus of elasticity; its rigidity is 15-20% larger than that of a general steel bearing.
6, high temperature resistance - all ceramic bearings can work at temperatures above 500C,
7, low torque - according to the layout; the torque of ceramic bearings is reduced by about 1/3,
8, non-magnetic and non-conductive - ceramic bearings can be protected from magnetic and electrical hazards.
With the deepening of the discussion and the breaking of many production techniques; the prospect of using ceramic bearings in the fields of high speed, high temperature and corrosion resistance will be very impressive.
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