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Material Alumina Al2O3Zirconia ZrO2Mixed oxides ZrO2/Al2O3Silicon carbide SICSilicon nitride Si3N4Boron nitrideMetal
Brief description Al2O3 purity 96%Al2O3
Mg-PSZ MgO partially stabilizedY-TZP Y2O3 partially stabilizedZrO2 particle-reinforcedAl2O3
SiSiC Si-infiltrated with 8-12% free SiliconSSiC sintered without free siliconHP SIC hot-pressed without free siliconHP SN hot-pressedSSN sinteredHP BN*
C-15* plain steel
Color whitewhiteyellowwhitewhitewhiteblackblackblackblackgreywhite-
Structural properties              
Open porosity%0000000000000
Average crystal sizeµm105500.70.70.51511055--
Mechanical properties              
Vickers hardness (HV10)MPa14001800120013001400170022002500250016001450190700
Compressive strengthMPa280028001600220021002600120022002900250025001601000
Flexural strengthMPa290340500100082060032042043085075070/30**450
Fracture toughnessMPam½-
Elastic modulus*GPa35038020020022036035041044032030030/25**210
Weibull modulus*-1010122020201210121815--
Poisson's ratio*-
Thermal properties              
max. Application temperature*
under protective gas
max. Application temperature*
in air
Specific heat at 20°CJ/Kg K9009005505006007009506501000750700-462
Thermal conductivity at 100°CW/mK25302262585759035353550
Coefficient of thermal expansion(20°C - 1000°C)10-6K-18.58.510.510.5994.
Thermal shock resistance*K180190260300300250400350450400450--
Electrical properties              
Volume resistivity at 20°CΩcm1014101410101091091090.210-1001021010101210140.0015
Volume resistivity at 400°CΩcm10111012104104104107-------
Volume resistivity at 1000°CΩcm1041071031031021050.050.20.2107107109-
Dielectric strengthkV/mm>18>25---------39-
Dielectric constant at 20°C and 1 GHz-89>20>20>20----2020--
Dielectric loss factor (tgΔ)
at 20°C and 1 GHz
Dielectric loss factor (tgΔ)
at 20°C and 10 kHz

Mixed ceramics

Values are benchmarks for easy comparison. Other materials on request

Mixed ceramics or dispersion ceramics (ATZ and ZTA ceramics)

A combination of positive oxide ceramics properties (ZrO2 / Al2O3) to provide enhanced material properties (ZTA / ATZ).

Mixed ceramics are materials that consist of a combination of zirconium oxide and aluminum oxide to produce advanced materials combining the high strength and impact resistance of zirconia with the hardness of alumina. In contrast to ATZ ceramics, the percentage share of alumina in ZTA ceramics is higher than that of zirconia.


Specific properties

High strength
High impact resistance
High hardness
High wear resistance
High Weibull modulus
High surface quality
Good electric insulation (ZTA)


Various implants in the medical engineering sector
High-performance cutting components used in the medical engineering sector
Metal processing and mechanical engineering
Knives, drills, cutters, indexable inserts