Zirconia
Zirconia (ZrO2) is the toughest of all monolithic advanced ceramics and has excellent room temperature mechanical properties.
Zirconia (or zirconium dioxide, ZrO2) is characterised by high impact resistance and very high strength and toughness giving it excellent wear resistance. In addition it is chemically stable resulting in excellent corrosion resistance.
Zirconia is typically used in applications in the metal forming industry as weld location pins for resistance welding of captive nuts on sheet metal.
ISN offers three grades of zirconia: Zircalon 5, Zircalon 10 and Zircalon 20. The properties of these materials are outlined below.
Zircalon 5
Zircalon 5 is an yttria stabilised zirconia (YSZ) and has very good strength and toughness. The table below lists typical mechanical, thermal and electrical property data for Zircalon 5.
Physical property data for Zircalon 5
| Property | Value | Units |
|---|---|---|
| Composition | YSZ | - |
| Density | 6.13 | g/cc |
| Porosity | 0 | % |
| 3 point Modulus of Rupture 20°C (Specimen 3 × 3 × 50mm, span 19.05mm) |
1000 | MPa |
| Weibull Modulus | 15 | - |
| Compressive Strength | >2000 | MPa |
| Young's Modulus of Elasticity | 205 | GPa |
| Poisson's Ratio | 0.30 | - |
| Hardness (HRA) | 91 | - |
| Hardness (Vickers Hv50) | 13.24 (1350) | GPa (Kg/mm2) |
| Fracture Toughness K1C | 8.0 | MPa m½ |
| Thermal Expansion Coefficient (0-1200°C) | 10.0X10-6 | K-1 |
| Thermal Conductivity | 2.0 | W/(mK) |
| Thermal Shock Resistance | 250 | ΔT°C quenched in cold water |
| Maximum Use Temperature | 1000 | °C |
| RT Electrical Resistivity | 1011 | ohm cm |
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
Download the Zircalon 5 Property Data Sheet PDF (0.19 Mb).
Zircalon 10
Zircalon 10 is an yttria stabilised zirconia (YSZ) and has higher strength and toughness than Zircalon 5. The table below lists typical mechanical, thermal and electrical property data for Zircalon 10.
Physical property data for Zircalon 10
| Property | Value | Units |
|---|---|---|
| Composition | YSZ | - |
| Density | 6.05 | g/cc |
| Porosity | 0 | % |
| 3 point Modulus of Rupture 20°C (Specimen 3 × 3 × 50mm, span 19.05mm) |
1200 | MPa |
| Weibull Modulus | 15 | - |
| Compressive Strength | >2000 | MPa |
| Young's Modulus of Elasticity | 205 | GPa |
| Poisson's Ratio | 0.30 | - |
| Hardness (HRA) | 91 | - |
| Hardness (Vickers Hv50) | 13.24 (1350) | GPa (Kg/mm2) |
| Fracture Toughness K1C | 10.0 | MPa m½ |
| Thermal Expansion Coefficient (0-1200°C) | 10.0X10-6 | K-1 |
| Thermal Conductivity | 2.0 | W/m/K |
| Thermal Shock Resistance | 250 | ΔT°C quenched in cold water |
| Maximum Use Temperature | 1000 | °C |
| RT Electrical Resistivity | 1011 | ohm cm |
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
Zircalon 20
Zircalon 20 is a magnesia stabilised zirconia (MSZ) and has better thermal shock resistance than either Zircalon 5 or Zircalon 10. The table below lists typical mechanical, thermal and electrical property data for Zircalon 20.
Physical property data for Zircalon 20
| Property | Value | Units |
|---|---|---|
| Composition | MSZ | - |
| Density | 5.7 | g/cc |
| Porosity | 0 | % |
| 3 point Modulus of Rupture 20°C (Specimen 3 × 3 × 50mm, span 19.05mm) |
500 | MPa |
| Weibull Modulus | 15 | - |
| Compressive Strength | >1600 | MPa |
| Young's Modulus of Elasticity | 210 | GPa |
| Poisson's Ratio | 0.30 | - |
| Hardness (HRA) | 90 | - |
| Hardness (Vickers Hv50) | 11.77 (1200) | GPa (Kg/mm2) |
| Fracture Toughness K1C | 7.0 | MPa m½ |
| Thermal Expansion Coefficient (0-1200°C) | 11.0X10-6 | K-1 |
| Thermal Conductivity | 2.5 | W/m/K |
| Thermal Shock Resistance | 350 | ΔT°C quenched in cold water |
| Maximum Use Temperature | 1000 | °C |
| RT Electrical Resistivity | 1011 | ohm cm |
Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
Zircalon Corrosion Behaviour
In addition to this outstanding property data, Zircalon also has excellent resistance to corrosion, often required for applications in the chemical and process industries.
The table below show the corrosion resistant behaviour of Zircalon in various acids and alkalis.
Zircalon corrosion behaviour in acids and alkalis.
| Acid/Alkali | Conc. % | Temp. | Exposure time / hrs | Reaction |
|---|---|---|---|---|
| Acetic Acid | 100 | Boiling | 100 | None |
| Benzoic Acid | 100 | Boiling | 100 | None |
| Formic Acid | 100 | Boiling | 100 | None |
| Hydrochloric Acid | 33 | Boiling | 100 | Weak |
| Hydrofluric Acid | 100 | Boiling | 100 | Strong |
| Nitric Acid | 69 | Boiling | 100 | Weak |
| Phosphoric Acid | 100 | Boiling | 100 | Weak |
| Sulphuric Acid | 98 | Boiling | 100 | Weak |
| Ammonium Chloride | 98 | Boiling | 100 | None |
| Potassium Chloride | 100 | Boiling | 100 | None |
| Sodium Chloride | 100 | Boiling | 100 | None |
| Sodium hydroxide | 50 | Boiling | 100 | None |
Typical corrosion data obtained under test conditions. The values given only apply to the test bodies on which they were determined, and therfore can only be recommended values. See our disclaimer.
The successful integration of advanced technical ceramics into engineering systems requires close collaboration between you, the end-user, and ourselves, the material suppliers. Please contact our Technical Department to discuss your requirments in detail and assist in exploiting the significant advantages which our advanced ceramics offer.
In addition, see our resources section for guides on designing with ceramics and more property data comparing Zircalon with other engineering ceramics.
