Ceramic Properties

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 (25-1000oC) /°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