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For over 60 years we have been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.

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Partially Stabilized Zirconia (PSZ)
*Click on a Property to see a comparison of up to 10 materials
Property* Value
General
Chemical FormulaZrO2-MgO
Mechanical
Density5.75 gm/cc
Hardness1120-1300 Knoop
Tensile Strength65 kpsi
Modulus of Elasticity29 - 30 x 106 psi
Flexural Strength100 kpsi
Compressive Strength268 kpsi
Poisson's Ratio0.23 - 0.31
Fracture Toughness12 MPa m½
Electrical
Dielectric Strength250 ac V/mil
Volume Resistivity> 1014 ohm-cm
Thermal
Coefficient of Thermal Expansion10.1 x 10-6/°C
Thermal Conductivity1.8 - 3 W/mK
Specific Heat0.10 cal/g °C
Maximum Working Temperature1100 °C
Shock Resistance400 °C Diff.
All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

Zirconia PSZ are cream colored blends with approximately 10% MgO and are high in toughness, retaining this property to elevated temperatures. They are somewhat lower in cost but have larger grain structure.

Zirconia is best known among ceramics as being both hard and fracture-tough at room temperature. Additionally, its fine (sub-micron) grain size enables excellent surface finishes and the ability to hold a sharp edge.

Although it retains many properties including corrosion resistance at extremely high temperatures, zirconia does exhibit structural changes that may limit its use to perhaps only 500 C. It also becomes electrically conductive as this temperature is approached.

Zirconia is commonly blended with either MgO, CaO, or Yttria as a stabilizer in order to facilitate transformation toughening. This induces a partial cubic crystal structure instead of fully tetragonal during initial firing, which remains metastable during cooling. Upon impact, the tetragonal precipitates undergo a stress induced phase transformation near an advancing crack tip. This action expands the structure as it absorbs a great deal of energy, and is the cause of the high toughness of this material. Reforming also occurs dramatically with elevated temperature and this negatively affects strength along with 3-7% dimensional expansion. The amount of tetragonal can be controlled by additions of the blends above to balance toughness against loss of strength.

Cubic Zirconia: This single crystal optically clear form of ZrO2 has a relatively low fracture toughness and strength, but very high thermal shock resistance.

Zirconia TZP: Yttria blends of approximately 3% are called tetragonal zirconia polycrystal (TZP) and have the finest grain size. These grades exhibit the highest toughness at room temperature, because they are nearly 100% tetragonal, but this degrades severely between 200 and 500 C as these irreversible crystal transformations also cause dimensional change.


Wikipedia Reference for Zirconia-PSZ

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