Zirconia - Zirconium Oxide - Stabilised with Magnesia ZrO2 / MgO - Supplier Data by Goodfellow

Background

Zirconias partially stabilised with either Magnesia or Yttria have excellent mechanical properties at high temperatures and are relatively inert to hostile environments. They have good impact and thermal shock resistance and are used in refractory applications. Their resistance to attack by most molten metals means they are often used as crucible materials.

Their high hardness and wear resistance lead to uses such as extrusion dies and high temperature nozzles. At higher temperatures they become conducting and are used as heating elements. They have also been used as thermal barrier coatings for gas turbine blades.

Key Properties

The key properties of Zirconias are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Fair
Acids - dilute Good
Alkalis Good-Poor
Halogens Fair
Metals Good-Fair
Mechanical Properties
Compressive strength ( MPa ) 1500-2000
Hardness - Vickers ( kgf.mm-2 ) 1200
Shear strength ( MPa ) 414
Tensile modulus ( GPa ) 200
Tensile strength ( MPa ) >300
Physical Properties
Apparent porosity ( % ) 0
Density ( g.cm-3 ) 5.74
Water absorption - saturation ( % ) 0
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 5-10 @ 20-1000 °C
Specific heat ( J.K-1.kg-1 ) 400-500 @ 25 °C
Thermal conductivity ( W.m-1.K-1 ) 1.5-2.5 @ 20 °C
Upper continuous use temperature ( °C ) 1000

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