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.
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|
|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|
|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.