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Zirconia-toughened Alumina

Zirconia-toughened alumina shows considerable improvement in strength and toughness over standard alpha alumina. This is brought about through the stress-induced transformation toughening mechanism.

This product is strengthened by fine zirconia particles dispersed throughout the alumina body.  Typical zirconia content is between 10% and 20%.

The properties are improved by a mechanism known as stress-induced transformation toughening.  As a crack grows through the ceramic, the crystal structure of the zirconia particles in the region of the crack changes from the metastable tetragonal phase to the stable monoclinic phase. The change increases the volume of the particles by about 3% and produces compressive stresses in the alumina matrix.  These stresses in turn close the crack and act as an energy barrier to further crack growth.  The addition of zirconia to the alumina matrix increases fracture toughness easily by two times and can be improved by as high as four times, while strength is more than doubled.

Characteristics of zirconia-toughened alumina include:

  • Excellent mechanical properties
  • Wear resistance
  • High-temperature stability
  • Corrosion resistance
Download the zirconia-toughened alumina pdf

Goodfellow Ceramic and Glass Division is able to supply a wide range of ceramic and glass materials as finished components. Our capabilities range from custom-made precision microcomponents with very high tolerance features to large heavy-duty components used in industrial applications. Additionally, standard semi-finished forms such as tubes, rods, bars, plates, crucibles and spheres are often available from our wide inventory. Please contact us with full details of your requirements, including drawings where available, and we will review and respond with a quotation as soon as possible.

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