NSK SKF KOYO Ceramic Deep Groove Ball Bearing6002

1.High temperature resistant 2.Corrosion resistant 3.Longer lasting 4.ISO9001 certificate 5.Plenty of stock

Size Range:

From 3mm to 200mm,standard & non-standard

Type:

More than 350 types, including metric and inch deep groove ball bearing, self-aligning bearing, angular contact bearing, plain bearing, and spherical bearing. Open type, seal rings, shields can be provided.

Retainer: NYLON, PTFE, PEEK, steel, bronze, or full complements.

Non-standard bearing can be designed and provided upon requirement.

Features:

Compared with traditional metal bearing, full ceramic bearing is featured in following aspects:

1. Could be used at higher temperature. Ceramic maintains mechanical properties at high temperature, so full ceramic bearing can be used at elevated temperature.

2. Corrosion resistant. Full ceramic bearing are more suitable for chemical industry application.

3. More suitable for temperature-variation application. Because thermal expansion co-efficiency of ceramic are smaller than metal, so the change of clearance of full ceramic bearing is smaller than that of metal bearing.

4. More resistance to seizing due to smaller thermal expansion.

5. Could work under poor lubrication, because ceramics are self-lubrication. Full ceramic bearing could be used at high-vacuum environment.

6. Could be used as insulation bearing and can prevent Electrical Arcing because ceramics is not electrical conductor.

7. Could be used in magnetic environment because ceramics do not respond to magnetic forces.

 Application:

Full ceramic bearing could be used in following industries: chemical, semi-conductor, valve & pump, food, electronic, medical, vacuum, refining, insulation, etc.

Note:

Full ceramic bearing is not suitable for heavy loading, impact loading and variable loading application.

  

Item	Material:  ZrO2	Bearing Steel
Density (g/cm3)	6.05	7.85
ThermalExpan  (10­-6/k)	10.5	12.5
Max Use Temperature  °C	750	300
Water Absorption (%)	0	0
Corrosion Resistance	Excellent	Poor

 The characteristic of ceramic bearings

Low density

Due to the low density, ceramic bearings have low centrifugal load, and create little heat so they can work in the conditions of higher speed.

Suitable elastic ratio

The elastic ratio of ceramics is higher than that of steel, this can increase bearing’s dynamic stiffness, however, the elastic ratio should not be too high, otherwise, excessive elastic ratio will create stress concentration to decrease the bearing capacity.Low thermal expansion

This can make bearings insensitive to the changes of temperature, and is helpful to preventing the bearings from being jammed. According to hybrid bearings, the applicable rotation speed interval can be wider.

 High strength

High compressing strength is the requirement of bearing high contact stress (for ceramics, the compression strength are usually determined by the rupture modulus measured by three-point or four-point bending strength )

 High hardness and high toughness

Ceramics have high hardness and high toughness can achieve good surface smoothness, and can prevent the damage of impact and other outer particles.

 Good rolling fatigue performances

This performance is an absolutely necessary for bearings.

  Flaking failure pattern

If the rolling element fails in the working, it should be fatigue flaking, this pattern has sign before bearings being jammed, and is the least harmful failure pattern.

The ceramic bearings working in extreme conditions have some appended performances

 Resistance to elevated temperatures and stability

Ceramic bearings can keep their mechanical stability up to 800°C.

 Corrosion resistance

In the conditions of oxidation and corrosion, especially the contact zone where the oil film have been pushed off due to the repeat rotation, the material should have good oxidation and corrosion resistance.

Now we can produce two kinds of ceramic bearings: ZrO2 ceramic bearings and Si3N4 ceramic bearings.

In the ceramic bearings produce deep ditch ball bearings are the main products, gauge 6000-6008 and 6200-6208, class P0 and P6.

Gauges	Classes	Materials
608~6008	P 0,P 6	ZrO2,Si3N4
6200~6208	P 0,P 6	ZrO2,Si3N4
1200~1208	P 0	ZrO2,Si3N4

NSK SKF KOYO Ceramic Deep Groove Ball Bearing6002