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Alumina Oxide Hybrid Ceramic Bearings For Ceramic Insulating Sleeve

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Alumina Oxide Hybrid Ceramic Bearings For Ceramic Insulating Sleeve

Country/Region china
Categories Steel Sheets
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Product Details

High Temperatures And Corrosive Alumina Zirconia Ceramic Bearings

 

Full Ceramic Bearings have races and balls that are made entirely of ceramic material and are superior to common steel bearings in many ways. Ceramic is the perfect material for any application seeking to achieve higher RPM’s, reduce overall weight or for extremely harsh environments where high temperatures and corrosive substances are present.

Full Ceramic Bearings are usually made of following materials:

· Silicon Nitride (SiN4)

· Alumina Oxide (Al2O3)

· Zirconia Oxide (ZrO2)

· Silicon Carbide (SiC)

Because ceramic is a glass like surface it has an extremely low coefficient of friction and is ideal for applications seeking to reduce friction.

 

1. Material peroformance

 

Full ceramic bearing ZrO2 material

Full ceramic bearing ZrO2 material has great property such like suitable for low and high temperatures, high load capacity, corrosion resistance, nonmagnetic insulated and self lubrication. Thus it suit for the specific applications which are not available for bearing steel and hybrid construction ceramic ball bearing materials.

Full ceramic bearing Si3N4 material
Full ceramic bearing Si3N4 material has similar property as ZrO2

material, In addition; it has lower weight , better wear resistance, high hardness, and it can bear higher temperature than ZrO2 material.

2. Structures

Rings(ZRO2/SI3N4)+ Retainer(PEEK/PTFE/NYLON)+Ball( ZRO2/SI3N4)

Rings(ZRO2/SI3N4) +Ball( ZRO2/SI3N4) full ball without retainer

Properties

Units

AL2O3

ZrO2

SiC

Si3N4

Density

g/cm3

3.65-3.93

5.95-6.0

3.12

3.23

Water absorption

0

0

0

0

0

Poission`s ratio

/

0.21-0.22

0.3

0.17

0.26

HV hardness hv

MPa

1650

1300-1365

2800

1500

Flexural strength

MPa

310

950

390

720

Heat conductivity

W/m*k

26-30

2-2.2

120

25

Electrical resistivity

Ω*mm2/m

>1016

>1015

>103

>1013

Dielectric constant

/

9.6

29

9.66-10.03

/

Dielectric strength

KV/mm

8.7

9

/

/

Coefficientof thermal expansion

10-16/k

7.9-8.5

10.5

3

3.2

Modulus of elasticity young`s mod

GPa

280-340

210

440

300

Flexural strength(700℃)

MPa

230

210

380

450

Compressive strength

MPa

2200

2000

1800

2300

Max use temperature

1750

1050

1550

1050

Resistance to acid alkaline

/

high

high

high

high

Thermal shock resistance

T(℃)

180-220

280-350

230-260

/

Fracture toughness

MPa*m1/2

4.2

10

3.9

6.2

Tensile strength

MPa

248

250

/

/

 
 
 

 

 

 

 

 

 

 

 

 

 

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