Zirkoniumdioxid zähe Tonerde(ZTA)
Introduction to ZTA (Zirconia Toughened Alumina): Properties, Benefits, Types, and Applications
ZTA (Zirconia Toughened Alumina) is a ceramic material primarily composed of alumina, with 10% or 20% zirconia added and sintered. Compared to pure alumina ceramics, ZTA offers approximately twice the strength and stiffness. When compared to zirconia ceramics, ZTA has a lower thermal expansion coefficient, higher thermal conductivity, and better resistance to thermal shock. By combining the strengths of both alumina and zirconia, ZTA stands out as a high-performance ceramic material.
Key Advantages of ZTA Ceramics
- Balances performance characteristics between alumina and zirconia ceramics.
- Costs significantly less than zirconia ceramics while being slightly more expensive than alumina ceramics, making it a cost-effective choice.
Typical Applications of ZTA
- Artificial joints
- Pump components
- Grinding media
ZTA (Zirconia Toughened Alumina) property chart
General | ||
property | Einheit | ZTA |
Farbe | weiß | |
Dichte | g/cm³ | 4.3 |
Wasserabsorption | % | 0 |
Gas Permeability | atms-cc/sec | gas tight <10-10 |
Mechanical Properties | ||
Propertiy | Einheit | ZTA |
Vickers Hardness (500 gm) | GPa (kg/mm2 ) | 14.3 (1470) |
Rockwell Hardness | R45N | 81 |
Compressive Strength @ RT | MPa (psi x 103) | 2757 (400) |
Biegefestigkeit (MOR) (3 Punkt) @ RT |
MPa (psi x 103) | 621 (90) |
Fracture Toughness (Notched Beam) | MPam1/2 | 6 |
Modulus of Elasticity | GPa (psi x 106) | 339 (48) |
Poissons Ratio | 0.23 | |
Tensile Modulus @ RT | MPa (psi x 103) | 350 (51) |
Thermal Properties | ||
Eigentum | Einheit | ZTA |
Thermal Conductivity @ RT | W/m-K | 24 |
Spezifische Wärmekapazität | J/g-°C | 0.800 |
C.T.E. 25 – 100°C | x 10-6/C | 6.0 |
C.T.E. 25°-300°C | x 10-6/C | 7.0 |
C.T.E. 25°-600°C | x 10-6/C | 7.1 |
Max.Service Temp.Air/Inert | Fahrenheit (°F) | 2584 |
Celsius (°C) | 1400 | |
Electrical Properties | ||
Eigentum | Einheit | ZTA |
Dielectric Constant @ 1 MHz | 12.5 | |
Dielectric Constant @ Gigahertz | 9.4 | |
Dielectric Loss @ 1 MHz | 0.0005 | |
Dielectric Loss @ Gigahertz | 9.4 | |
Dielectric Strength (.125” Thick) | V/mil | 250 |
Volume Resistivity @ 25°C | ohms-cm | > 1 x 10¹⁴ |
Volume Resistivity @ 300°C | ohms-cm | 1 x 10¹º |
Volume Resistivity @ 500°C | ohms-cm | 2 x 10⁹ |
Volume Resistivity @ 700°C | ohms-cm | 4 x 10⁸ |
*Die Werte stellen typische Materialeigenschaften dar und können je nach Produktkonfiguration und Herstellungsprozess variieren,
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