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Ceramic Materials & Their Properties

There are a variety of different ceramic materials each with their own different 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.

Materials

Silicon Nitride
Density 3.2 g/cm3
Linear expansion coefficient .1×10-6/oC
Hardness 1450Kg/mm2
Elastic modulus 310GPa
Poisson’s Ratio 0.27
Electrical Resistance 1016Ωcm
Zirconia
Density 6.05 g/cm3
Linear expansion coefficient 10.3×10-6/oC
Hardness 1300Kg/mm2
Elastic modulus 220GPa
Poisson’s Ratio 0.31
Electrical Resistance 1013Ωcm
Silicon Carbide
Density 3.1g/cm3
Linear expansion coefficient 3.9×10-6/oC
Hardness 2200Kg/mm2
Elastic modulus 380GPa
Poisson’s Ratio 0.16
Electrical Resistance 108Ωcm
Stainless Steel (440C)
Density 7.6g/cm3
Linear expansion coefficient 12.5×10-6/oC
Hardness 750Kg/mm2
Elastic modulus 200GPa
Poisson’s Ratio 0.3

ceramic

The most common ceramic materials and their properties are listed to the left along with 440C stainless steel as a comparison to a conventional material.

Components made of ceramic materials have a number of special properties such as being a strong electrical insulators and highly resistant to temperatures opening a wider range of application than was thought possible prior to their utilisation.

Aspects such as lower density gives both a weight saving and an increased life as the centripetal force acting upon the bearing is less therefore reducing the wear on the rolling elements.

View Ceramic Materials & Their Properties Part 2 »

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