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Ceramic Materials and Their Properties

There are a variety of different ceramic materials, each with their own capabilities, advantages and disadvantages; their use in bearing and rolling element applications was pioneered by many of the space agencies and continues to be at the forefront of engineering technology.

Silicon Nitride (Si3N4)

Performance unit Si3n4
Ingredients Aluninum (Al)              2.0~3.5%
Yttrium (Y)              4.0~5.0%
Titanium (Ti)              1.0~1.5%
Oxygan (O)              4.5~6.0%
Carbon(C)             0.3~0.8%
Other impurities less than 0.1%
The rest is silicon nitride
Density g/cm3 ≥3.20
Hardness Hv 1400~1600
Bending strength Mpa >800
Compressive strength Mpa >4000
Elastic Modulus Gpa 300~315
Fracture toughness Mpa.m1/2 6~8
Cofficient of thermal expansion 10-6/℃ 2.2~3.0
Highest temperature 800
Color black
Technology CIP+GPS

Zirconia (Zirconium Oxide, ZrO2)

Performance unit Zirconia
Ingredients Y2O3 % 5.21
FeO3 <0.001
Na2O <0.001
SiO2 <0.001
TiO2 <0.001
ZrO2 >94
Density g/cm3 ≥6.0
Hardness Kg/mm2 1100~1300
Bending strength Mpa >950
Fracture toughness Mpa.m-3/2 8.0~10.0
Elastic Modulus Gpa 210

Silicon Carbide (SiC)

Performance unit sign Sillicon carbon
Purity SiC content % >99%
Density g/cm3 >3.10
Hardness Kg/mm2 2800
Bending strength Mpa >400
Compressive strength Mpa 3000~3900
Fracture toughness Mpa.m-3/2 4~5
Elastic Modulus Gpa 410
Poisson’s ratio 0.14
Cofficient of thermal expansion X10-6/℃ 4.3
Grain size μm <8
Free silicon content % <0.5

 

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