Comparison of metal bearings and ceramic bearings
The following is a comparative analysis of the advantages and disadvantages of ceramic bearings and metal bearings, combined with application scenarios to provide selection reference:
First, the core advantages of ceramic bearings
1. Extreme environmental adaptability
A. Corrosion resistance: ceramic materials (such as...
The following is a comparative analysis of the advantages and disadvantages of ceramic bearings and metal bearings, combined with application scenarios to provide selection reference:
First, the core advantages of ceramic bearings
1. Extreme environmental adaptability
A. Corrosion resistance: ceramic materials (such as silicon nitride, zirconium oxide) are virtually immune to strong acid and alkali corrosion, and are suitable for corrosive environments such as chemical industry and deep-sea equipment.
B. Temperature resistance: it can withstand drastic temperature difference from -196℃ to 1000℃, and its performance is stable in high temperature smelting, liquid nitrogen treatment and other scenarios.
C.Antimagnetism and insulation: no magnetic interference, suitable for medical equipment, precision instruments.
2.Performance
A.Low friction and high speed: surface smoothness is better than metal, low coefficient of friction, self-lubricating characteristic reduces the dependence on grease, and the speed is increased by 20%-40%.
B. Lightweight: ceramic rolling body density is only 40% of steel, centrifugal force is reduced, prolonging the service life (up to 3-50 times of metal bearings).
C. High rigidity: modulus of elasticity is 15-20% higher than steel, small deformation under force, good accuracy retention.
3 Life and maintenance
Fatigue life is far more than metal bearings, full ceramic structure life for the steel bearing 10-50 times, mixed ceramic structure (ceramic ball + metal ring) for 3-5 times.
Second, the limitations of ceramic bearings
1.Mechanical performance defects
A. High brittleness: weak impact resistance, heavy load or high vibration scene easy to break.
B. Low load carrying capacity: not suitable for heavy machinery (such as truck shaft bearing parts).
2.Cost and process
A.Processing difficulty, the price is 5-10 times of metal bearings.
B. Installation accuracy requirements are stringent, a small deflection may lead to failure.
Third, the core advantages of metal bearings
1. Strong comprehensive mechanical properties
A. High load bearing and impact resistance: bearing steel / alloy resistant to heavy pressure and impact, applicable to construction machinery, automobile wheels, etc..
B. Ductility: slight deformation after stress can buffer stress, reduce the risk of sudden fracture.
2. Cost and universality
A.Mature processing, low cost, accounting for more than 90% of conventional industrial applications.
B.Simple maintenance, standard lubrication programme universal.
3.Improved metal bearings
A.Stainless steel bearings: improve rust resistance, washable, suitable for food machinery, humid environments.
Fourth, the limitations of metal bearings
1. Weak environmental adaptability
A. Easy to corrode, acid and alkali environment life plummeted.
B. Easily annealed and deformed at high temperatures (> 300 ℃ performance decline).
C. Metal fatigue leads to lower life (especially high-speed scenes).
2.Performance bottleneck
A. High friction resistance, high-speed operation requires continuous lubrication.
B. Large weight, high speed centrifugal force aggravates wear.
Fifth, selection recommendations
Scenario
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Recommendation Type
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Key Rationale
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Strong corrosion/temperature extremes
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Full ceramic bearings
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Corrosion resistance, wide temperature stability
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High-speed precision equipment (medical, aerospace)
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Mixed Ceramic Bearings
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Lightweight + low friction, balanced price/performance ratio
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Heavy duty/shock environment (construction machinery)
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Metal Bearings
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High load bearing, shock resistant, low cost
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General industrial equipment
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Metal or stainless steel bearings
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Economical and easy to maintain
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