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Zirconia Toughened Alumina (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.

PropertyUnitTestZirconia Toughened Alumina
Densityg.cc-1ASTM C204.0
Colour****WHITE
Elastic ModulusGPaASTM C848360
Flexural StrengthMPaASTM F417450
Compressive StrengthMPaASTM C7732900
Fracture Toughness RangeMPaNOTCHED BEAM5-6
HardnessGPaROCKWELL 45N85
Thermal ConductivityW/mKASTM C2027
CTE 25-100010(-6)/0C/ASTM C3728.2
Thermal Shockdelta TcNOTE3300
Dielectric Strengthac-kv/mm (6.25mm)ASTM D1169.0
Dielectric Loss250C@1MHzASTM D25200.0005
Volume Resistivity1000C ohm-cmASTM D182910^6
  • 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.
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