Zirconia Ceramics(ZrO2) materials are used in very high wear applications with very high pressure, possessing higher fracture toughness and stiffness than alumina. Zirconia is widely applied for its high strength, toughness, wear and thermal properties. It warrants its usage for longer life and reduce less time where alumina fails in this applications.
During manufacture, the zirconia powder is combined with oxides such as yttria, magnesia or tetragonal. The material is almost partially stabilized or even it can be fully stabilized if required, the different composition allows different properties to be enhanced.
Advantages of Zirconia Ceramics
*Excellent fracture toughness
*Very good wear resistance
*High corrosion stability
*Low thermal conductivity
*CTE in range of steel
| Characteristics | Unit | 95 Al2O3 | 99 Al2O3 | ZrO2 | GPSi3N4 | BN | Glass Ceramic |
| Crystal Structure | - | hexagonal | hexagonal | tetragonal | hexagonal | hexagonal | - |
| Color | - | white | ivory | white | gray | white | white |
| Density | g/cm3 | 3.65 | 3.88 | 5.95 | 3.22 | 2.26 | 2.55 |
| Water Absorption | % | 0 | 0 | 0 | 0 | 0.0-1.0 | 0 |
| Young's Modulus | Gpa | 280 | 350 | 205 | 295 | 670 | 65 |
| Vickers Hardness | Gpa | 14 | 20 | 12 | 18-20 | - | - |
| Flexural Strength @R.T. | Mpa | 280 | 300 | 900 | 650 | 51 | 100 |
| Compressive Strength @R.T. | Mpa | 2000 | 2500 | 2200 | 2200 | 230 | 500 |
| Thermal Conductivity @R.T. | W/(m*k) | 18-25 | 30 | 2.2 | 25 | 20 | 1.7 |
| Thermal shock resistance | Δ(℃) | 220 | 180-200 | 280-350 | 450-650 | >1500 | 25-100 |
| Max. Working Temperature @R.T. | ℃ | 1500 | 1700 | 850 | 1200 | 960 | 800 |
| Volume Resistivity @R.T. | Ω*cm | >10^15 | >10^14 | >10^12 | >10^14 | 10^13 | 10^16 |
| Dielectric Constant (1 MHz @R.T. ) | - | 9.5 | 9.8 | 26 | 8.2 | 4.08 | 6.02 |
| Dielectric Strength | kV/mm | 16 | 22 | - | 16 | 375 | 40 |
Applications of Zirconia Ceramics
1.Various wear parts for wear applications
2.Valves and pump components
3.Ceramic plain, balls and roller bearings
4.Tubes, fixtures etc. for High temperature
5.Copper tube extruding & reducer dies
6.Thermal insulation components
7.Wear resistance and Cutting blades
8.Ceramic knives
9.Grinding media
About UniPreTec
As a professional company in advanced ceramic industries, UNIPRETEC is manufacturing and supplying high quality and high precision ceramic components for clients from worldwide. Our ceramic products are widely used in various fields of automotive, metallurgy, machinery, electronic & electrical, food, chemical, medical and so on. With experienced engineers and talented workers, we are able to evaluate projects and drawings properly, make valuable suggestion, supply satisfying products.
Main materials we supply:
- Aluminium Oxide (Al2O3)
- Zirconium Oxide (ZrO2)
- Silicon Nitride (Si3N4)
- Boron Carbide (B4C)
- Hex Boron Nitride (hBN)
- Machinable Glass Ceramic
We offer customized production service,free quotation,free sample, any contact related to advanced ceramic products is welcome. If you need any further information, please do not hesitate to contact us at our office.
