KYOCERA ADVANCED CERAMIC MATERIALS Material Silicon Nitride (Si3N4) Silicon Carbide (SiC) Zirconia (ZrO2 Alumina (Al2O3) Sapphire Kyocera No.   SN-220 SN-220M SN-235P SN-281 SC-211 SC-1000 Z-201N A-479 A-479G 99.9% Alumina 99.95% Alumina SA-100 Color   Black Gray Gray Gray Black Black Ivory 99% White 99.5% Ivory 99.9% Ivory 99.95% white 99.99% Transparent Bulk Density — 3.2 3.2 3.2 3.34 3.2 3.16 6.0 3.8 3.8 3.95 3.95 3.97 Water Absorption % 0 0 0 0 0 0 0 0 0 0 0 0 Vickers Hardness Load 500g GPa 14.2 14.2 14.2 14.8 23.5 24.0 12.3 16.2 17.6 17.6 20.6 22.5 Flexural Strength (4-point Bending *3-point Bending) R.T. kg/mm2 MPa 60 590 69 676 84 820 73 720 55 539 49 480 100 *980 31 *304 33 *323 50 *490 60 *588 70 *686 800° kg/mm2 MPa 61 600 69 676 84 820 — — — 42 *412 28 *274 — — — — 1000° kg/mm2 MPa 52 510 61 600 73 720 68 665 48 470 49 480 28 *274 18 *176 — — — — 1200° kg/mm2 MPa 33 323 40 392 — 62 607 40 392 49 480 17 *167 — — — — — 1300° kg/mm2 MPa 12 117 — — — — — — — — — — — 1400° kg/mm2 MPa — — — 54 530 36 353 49 480 — — — — — — Fracture Toughness (K1C)M.I MPa√m 5.7 6.1 6.7 6.2 5.6 — 6.7 — — — — — Young's Modulus R.T. x106psi GPa 43 294 43 294 44 300 46 318 63 431 63 430 30 206 50 343 53 363 56 391 56 391 69 470 Poisson's Ratio R.T. — 0.28 0.28 0.28 0.28 0.16 0.17 0.31 0.25 0.23 0.23 0.23 — Coefficient of Linear Thermal Expansion 40-400°C (x106/°C 2.6 2.5 2.6 2.6 4.0 3.9 10.5 7.1 7.1 — — — 40-800°C 3.2 3.1 3.1 3.2 4.4 4.5 11.0 7.9 7.9 — — — Thermal Conductivity R.T. cal/cm • sec • °C 0.05 0.06 0.06 0.14 0.15 0.31 0.009 0.06 0.06 0.08 0.09 0.10 W/m • K 21 25 25 59 63 130 4 25 25 33 37 42 Specific Heat R.T. cal/g • °C 0.16 0.16 0.16 0.16 0.15 0.16 0.12 0.19 0.19 0.19 0.19 0.18 Heat Shock Resistance ΔT °C 550 670 670 750 400 300 300 300 — — — — Volume Resistivity R.T. Ω • cm >1014 >1014 >1014 >1014 8x1014 103 2x1012 >1014 >1014 >1014 >1014 >1016 Close