ZTA

Zirconia-toughened alumina (ZTA) shows a considerable improvement in strength and more importantly toughness. As a result, these ceramics can be used in areas of extreme mechanical abrasion and thermal shock.

Fully stabilised zirconia (FSZ) produces a high-density ceramic on sintering. The grain size is relatively large at 10-40µm (microns) and the ceramics are often translucent in appearance. Recent optimisation of zirconia powders have resulted in a readily sinterable high-purity product.

Material Properties

Please note that the information set forth herein is offered for comparison only, and is not to be construed as absolute engineering data or constituting a warranty or representation for which we assume legal responsibility.

Property Unit Test Zirconia Toughened Alumina
Density g.cc-1 ASTM C20 4.0
Colour ** ** WHITE
Elastic Modulus GPa ASTM C848 360
Flexural Strength MPa ASTM F417 450
Compressive Strength MPa ASTM C773 2900
Fracture Toughness Range MPa NOTCHED BEAM 5-6
Hardness GPa ROCKWELL 45N 85
Thermal Conductivity W/mK ASTM C20 27
CTE 25-1000 10(-6)/0C/ ASTM C372 8.2
Thermal Shock delta Tc NOTE3 300
Dielectric Strength ac-kv/mm (6.25mm) ASTM D116 9.0
Dielectric Loss 250C@1MHz ASTM D2520 0.0005
Volume Resistivity 1000C ohm-cm ASTM D1829 10^6
  • DATA MEASUREMENTS – All data measurements are typical and made at room temperature unless otherwise noted.
  • THERMAL SHOCK RESISTANCE – Tests are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as ‘delta Tc’.
  • CHEMICAL RESISTANCE – Although all alumina and zirconia ceramics are highly resistant to chemical attack, it is recommended that specific applications are discussed with Almath Crucibles to ensure optimum ceramic selection.

View our full range of ZTA Crucibles.

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