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
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.

View our full range of ZTA Crucibles.

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