Zro2 - Materials - Technical

Zirconia (ZrO2)

SPB Products made from this material
Balls, Bearings

Zirconia offers chemical and corrosion inertness to temperatures well above the melting point of aluminium oxide. Zirconia has low thermal conductivity. It is electrically conductive above 600oC. Bearings made from Zirconia can be run at extreme temperatures, even higher than that of Silicon Nitride, however the PTFE cage must be removed if temperature will exceed the max temperature for PTFE.

Zirconia bearings are only for slow speed applications, but will handle temperature and chemical resistance better than Silicon Nitride. They run smoothly without lubrication, which means nearly no maintenance is required. Full ceramic bearings are used in chemical, metallurgical, food, electronic and other industries.

Physical Properties
PROPERTY UNIT VALUE
Volume Resistivity Ohm.cm 1010
Compressive Strength MPa 1800
Hardness kgf.mm2 1300
Porosity % 0
Tensile Strength MPa 440
Compressive Strength MPa 1800
Flexural Strength MPa 900
Elastic Modulus GPa 200
Poisson’s Ratio   0.23 to 0.31
Density g/cm3 6.0
Thermal Conductivity W/m.oK 1.8 to 3.0oC
Coefficient of Thermal Expansion 10-6/oC 10.1
Max. use temperature (unloaded) oC 1100
Electrical Resistivity ohm/cm 2.2 x 1012 @ 500oC

Chemical Resistance
Chemical Resistance
Acids (Concentrated) Fair
Acids (Dilute) Good
Alcohols Good
Alkalis Good
Greases and Oils Good
Halogens Good

Products made with Zirconia can be found in the Small Parts and Bearings online catalogue.


You can purchase ZRo2 products in the Small Parts and Bearings Ceramic ZRo2 Online Catalogue pages.


For a huge range of bearings online please visit the Bearing Shop Online Website.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.



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