Material Properties for Alumina Ceramics
Properties / Method Unit PEC94 PEC96 PEC995 PEC998
Composition Weight % 96% Al2O3 99.5% Al2O3 99.8% Al2O3
Process -- Sintered Sintered Sintered
Color -- White White White Ivory
Density g/cm3 3.69 3.71 3.90 3.92
Flexural Strength / MOR MPa 364 372 388 395
Fracture Toughness, K(IC) / Notched Beam MPa m1/2 4 4 5 5
Hardness / Knoop 1000g Kg/mm2 1200 1200 1450 1500
Young’s Modulus GPa 305 305 380 380
Poisson’s Ratio -- 0.21 0.21 0.22 0.22
Average Grain Size Microns, 10 6 5 4
Max Use Temperature Degrees °C 1725 1725 1725 1725
Thermal Shock Resistance, DT  °C 300 300 250 250
Gas Permeability atm-cc/sec None None None None
Dielectric Constant 1 MHz, 25 °C 9.1 9.2 9.8 10.5
Thermal Expansion Coefficient (25-1000 oC) /°C 7.8 x 10-6 7.8 x 10-6 8.0 x 10-6 8.0 x 10-6
Thermal Conductivity W/m·°K, 20°C 22.5 24.9 29.0 30.0
Material Properties for Zirconia, Silicon Nitride, & EDM-Machinable Ceramics
Properties / Method Unit TZ-30D TZ-30M SSN-310 PEC EDM
Composition Weight % YTZP Zirconia High Strength Mg-PSZ Zirconia Silicon Nitride EDM Machinable
Process -- Sintered & HIPPED* Sintered/ Toughened Sinter- Reaction Bonded Hot Pressed
Color -- Varies (Gray-Green) Ivory Black Black
Density g/cm3 6.05 5.83 3.20 3.90
Flexural Strength/ Four Point Bending MPa 1400 650 800 690>
Compressive Strength/ ASTM-C773 MPa, 25 °C 2500 1750 -- --
Fracture Toughness, K(IC)/SENB Notched Beam MPa m1/2 8 10 5.8
Young’s Modulus/ Pulse-Echo Method GPa 220 200 310 406
Average Grain Size Microns, m < 1 20 -- < 3
Max Use Temperature

Recommended Use Temp		 Degrees °C

Degrees °C		 1500

< 280
 1500

< 1150		 1600

up to 1600		 1600

up to 1600
Thermal Shock Resistance, DT °C 400 400 500 --
Hardness / Knoop1000 g Kg/mm2 1300 1200 1800 2400
Dielectric Constant 1 MHz, 25 °C 28 27 9 --
Electrical Resistivity Ohm-cm 1013 1013 1014 9 x 10-3

Thermal Expansion Coefficient

(25-1000 oC)

 /°C 10.3 x 10-6 10.1 x 10-6 3.1 x 10-6 7.0 x 10-6
Thermal Conductivity W/m·°K, 25°C 2.2 2.2 26 63

Note:

The information specified in this data sheet is for design
guidance only.  Forming methods and specific geometry
will affect exact values.  ASTM methods were followed
for all test.