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HobbyParts Zro2 - Materials - Technical Information
Zirconia (ZrO2)
MBA 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 MBA online catalogue.
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H.E. Supplies (Hobby Engineering Supplies) offers thousands of products including remote controlled cars, planes, boats, and helicopters. We stock spare parts for remote controlled models. Our range includes the popular Solarbotics solar model kits and spares. We also distribute the full range of miniature engineering products from Miniature Bearings Australia. This range includes small bearings, timing pulleys, timing belts, seals, o-rings, gears and more. Also available from our store in Mansfield Queensland are a full range of lubricants, adhesives, kites, balsa wood and plastic rod and sheet materials. See our Online Catalogue for more information. Our main business is handled from our sales counter and showroom at 186 Wecker Road Mansfield, Queensland, Australia, but we also sell by phone, fax, online and mail order. We offer all of our hobby parts through our online store and some of the more popular MBA items. If you would like to purchase other MBA items online, Small Parts and Bearings offer the full range in their online catalogue.Using the links at the top of this page you will find extensive information including catalogues (Products and Store link), technical data, and other product specific information.
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