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Zirconia (ZrO2) Ceramics
Zirconia ceramic, also known as zirconium oxide (ZrO2), is a white crystalline oxide of zirconium. Its most naturally occurring form is the mineral baddeleyite with a monoclinic crystalline structure. Zirconium oxide ceramics have the highest toughness and strength at room temperature of all advanced ceramic materials. It also has a high thermal expansion, low thermal conductivity, and high resistance to corrosion. Its unique resistance to crack propagation and high thermal expansion make it an excellent material for joining ceramics and metals such as steel.
Read more: Zirconium Oxide Ceramic & Its Uses
Zirconia Properties:
There are three types of crystal structures of zirconia ceramics: cubic crystal, tetragonal and monoclinic. Pure zirconia is monoclinic (m), under ambient conditions. With increasing temperature, the material transforms to a tetragonal crystal structure (t) at ∼1170 °C and then to a cubic crystal structure (c), followed by a fluorite structure at ∼2370 °C with melting at 2716 °C.
| Material | Zirconia | |
| Properties | Units | ZrO2 |
| Color | - | Ivory & White |
| Permeability | - | Gas-tight |
| Density | g/cm3 | 5.89 |
| Straightness | - | 1‰ |
| Hardness | Mohs Scale | 8.5 |
| Water Absorption | - | 0 |
| Flexural Strength（Typical 20℃） | Mpa | 1200 |
| Compressive Strength （Typical 20℃） |
Mpa | 5700 |
| Coefficient of Thermal Expansion (25℃ to 800℃） |
0-6/℃ | 10 |
| Dielectric Strength （5mm Thickness) | AC-kv/mm | - |
| Dielectric Loss 25ºC@1MHz |
- | 0.001 |
| Dielectric Constant | 25º C@1MHz | 29 |
| Volume Resistivity (20℃） （300℃） |
Ω·cm³ | >10^13 5*10^8 |
| Long-term Operating Temperature | ℃ | 2200 |
| Thermal Conductivity (25℃） | W/m·K | 3 |
Advanced Ceramic Materials (ACM) is a leading supplier of zirconia ceramic products of the highest quality for a wide range of applications. We are happy to provide advice on materials, design, and application. Feel free to contact us with any questions about ZrO2 or other ceramic materials that are not listed on the website.
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