Product Code :
Zirconia Toughened Alumina Ceramics (referred to as composite ceramics, ZTA) has the characteristics of corrosion resistance and chemical stability. Alumina has high hardness and the toughness of zirconia is good. The composite ceramics have the properties of both materials, it has higher flexural strength and fracture toughness at room temperature, and zirconia toughened ceramics have excellent wear resistance, high strength, and hardness. The main advantage of Zirconia Toughened Alumina (ZTA) is the additional strength and toughness over alumina with a lower cost than zirconia (YTZP, MSZ, CSZ). The combination of aluminum oxide and 10-20% zirconium oxide provides a much higher strength, toughness, hardness and wear resistance than alumina alone. The 20-30% increase in strength often provides the design criteria needed at a much lower cost than using zirconia. A process called transformation toughening is the phenomenon that increases the fracture toughness of ZTA. When placed under stress, the zirconia particles change their crystal structure from a tetragonal to a monoclinic structure, causing a volume expansion that compresses the surrounding crack in the alumina matrix. ZTA should be considered for any application where structural strength is needed that exceeds the standard alumina properties.
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Product Information
Zirconia Toughened Alumina Ceramics (referred to as composite ceramics, ZTA) has the characteristics of corrosion resistance and chemical stability. Alumina has high hardness and the toughness of zirconia is good. The composite ceramics have the properties of both materials, it has higher flexural strength and fracture toughness at room temperature, and zirconia toughened ceramics have excellent wear resistance, high strength, and hardness. The main advantage of Zirconia Toughened Alumina (ZTA) is the additional strength and toughness over alumina with a lower cost than zirconia (YTZP, MSZ, CSZ). The combination of aluminum oxide and 10-20% zirconium oxide provides a much higher strength, toughness, hardness and wear resistance than alumina alone. The 20-30% increase in strength often provides the design criteria needed at a much lower cost than using zirconia. A process called transformation toughening is the phenomenon that increases the fracture toughness of ZTA. When placed under stress, the zirconia particles change their crystal structure from a tetragonal to a monoclinic structure, causing a volume expansion that compresses the surrounding crack in the alumina matrix. ZTA should be considered for any application where structural strength is needed that exceeds the standard alumina properties
Zirconia Toughened Alumina Disc Specifications
Dimensions
Per your request or drawing
We can customized as required
Properties（Theoretical）
| Condition | Unit | ZTA | ||
| Material | — | — | Al2O3/ZrO2 | |
| Color | — | — | White | |
| Density | — | g/cm3 | 4 | |
| Melting Point | 2,072° C (3,762° F) | |||
| Boiling Point | 2,977° C (5,391° F) | |||
| Surface Roughness | — | μm | 0.2 | |
| Reflectivity | 0.3-0.4mmt | % | 80 | |
| 0.8-1.0mmt | % | 90 | ||
| Mechanical | Bending strength | 3-point method | MPa | 700 |
| Modulus of Elasticity | – | GPa | 310 | |
| Vickers Hardness | – | Gpa | 15 | |
| Fracture toughness | IF method | MPa∙m1/2 | 3.5 | |
| Thermal | Coefficient of thermal expansion | 40-400℃ | 10–6/K | 7.1 |
| 80-400℃ | 10–6/K | 8 | ||
| Thermal conductivity | 25℃ | W/(m∙K) | 27 | |
| 300℃ | W/(m∙K) | 16 | ||
| Specific heat | 25℃ | J/(Kg∙K) | 720 | |
| Electrical | Dielectric constant | 1mHZ | – | 10.2 |
| Dielectric loss factor | 1MHZ | Tanx10-4 | 0.2 | |
| Volume resistivity | 25℃ | Ω∙cm | >1014 | |
| Breakdown strength | DC | kV/mm | >15 | |
| Property | ASTM Method | Units | ZTA-15 | ZTA-19 | |
| General | Crystal Size (Average) | Thin Section | Microns | 6 | 3 |
| Color | -- | -- | White | White | |
| Gas Permeability | -- | Atms-Cc/Sec | Gas Tight <10-10 | Gas Tight <10-10 | |
| Surface Roughness | -- | μm | 0.2 | 0.2 | |
| Water Absorption | C 20-97 | % | 0 | 0 | |
| Mechanical | Density | C 20-97 | G/Cc | 4.15 | 4.25 |
| Hardness | Vickers 500gm | GPa (Kg/Mm2) | 14.5 (1478) | 14.4 (1470) | |
| Hardness | -- | R45N | 82 | 82 | |
| Bending strength(3-point method) | Mpa | 700 | 710 | ||
| Fracture Toughness | Notched Beam | MPam1/2 | 6 | 6 | |
| Flexural Strength (MOR) | F417-87 | MPa (Psi X 103 | 586 (85) | 620 (90) | |
| (3 Point) @ RT | |||||
| Tensile Strength @ RT | -- | MPa (Psi X 103) | 344 (50) | 350 (51) | |
| Compressive Strength @ RT | -- | MPa (Psi X 103) | 2758 (400) | 2758 (400) | |
| Elastic Modulus | C848 | GPa (Psi X 106) | 338 (49) | 338 (49) | |
| Poisson's Ratio | C848 | -- | 0.23 | 0.23 | |
| Thermal | C.T.E. 25 - 100° C | C 372-96 | X 10-6/C | 6 | 6 |
| C.T.E. 25 - 300° C | C 372-96 | X 10-6/C | 7 | 7 | |
| C.T.E. 25 - 600° C | C 372-96 | X 10-6/C | 7.1 | 7.1 | |
| Thermal Conductivity @ RT | C 408 | W/M K | 24 | 24 | |
| Max Use Temp | -- | Fahrenheit (°F) | 2730 | 2730 | |
| -- | Celsius (°C) | 1500 | 1500 | ||
| Electrical | Dielectric Strength (.125" Thick) | D 149-97A | V/Mil | 250 | 250 |
| Dielectric Constant @ 1 MHz | D 150-98 | -- | 12.5 | 12.5 | |
| Dielectric Constant | D 2520-95 | -- | -- | 12.4 | |
| @ Gigahertz | D 2520-95 | -- | -- | 9.4 | |
| Dielectric Loss @ 1 MHz | D 150-98 | -- | 0.0006 | 0.0006 | |
| Dielectric Loss | D 2520-95 | -- | 0.0005 | 0.0005 | |
| @ Gigahertz | D 2520-95 | -- | 9.4 | 9.4 | |
| Volume Resistivity, 25°C | D 257 | Ohms-Cm | > 1 X 1014 | > 1 X 1014 | |
| Volume Resistivity, 300°C | D 1829 | Ohms-Cm | 1 X 1010 | 1 X 1010 | |
| Volume Resistivity, 500°C | D 1829 | Ohms-Cm | 2 X 109 | 2 X 109 | |
| Volume Resistivity, 700°C | D 1829 | Ohms-Cm | 2 X 108 | 4 X 108 |
Advantages
- Lower Cost Than Zirconia
- High Erosion Resistance
- Capable Of A Very Fine Surface Finish
- Higher Strength Than Alumina
- High Corrosion Resistance
- High Fracture Toughness
ZTA Machining
ZTA can be machined in green, biscuit, or fully dense states. While in the green or biscuit form, it can be machined relatively easily into complex geometries. However, the sintering process that is required to fully densify the material causes the zirconia body to shrink approximately 20%. This shrinkage means that it is impossible to hold very tight tolerances when machining zirconia pre-sintering. In order to achieve very tight tolerances, the fully sintered material must be machined/ground with diamond tools. In this manufacturing process, a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created. Due to the inherent toughness and hardness of the material, this can be a time consuming and costly process.
Applications of Zirconia Toughened Alumina Disc
Where high strength and erosion-resistant material is needed, ZTA ceramics can become the first choice. Industrial components such as valve seals, sleeves, pump pistons, and spraying nozzles are perfectly suited for ZTA.
Pump Piston Sleeves
Instrument
Sensor Bulbs
Valve Seals
Impellers
Insulators
Probe Bodies
Pump Components
Bushings
Fluid Delivery System Components
Analytical Instrument Columns
Standoffs
Packing of Zirconia Toughened Alumina Disc
Standard Packing:
Sealed bags in carton boxes. Special package is available on request.
As a ceramic material, ZTA is quite fragile in a lot of cases. The ZTA Disc are usually held in plastic bags by vacuum, and protected with heavy foam.
ATTs’ ZTA Disc is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.
Chemical Identifiers
| Linear Formula | ZrO-Al2O3 |
| MDL Number | MFCD00003424 |
| EC No. | N/A |
| Beilstein/Reaxys No. | N/A |
| Pubchem CID | 14769 |
| IUPAC Name | Oxo(oxoalumanyloxy) alumane |
| SMILES | O=[Al]O[Al]=O |
| InchI Identifier | InChI=1S/2Al.3O |
| InchI Key | TWNQGVIAIRXVLR-UHFFFAOYSA-N |
