Ceramic Properties - Alumina 99.5%
Alumina represents the most commonly utilized ceramic material in industry. Purity levels are available from 85% through 99.9%. This is because of extremely superior abrasion, high temperature and chemical resistance. It is electrically insulating as well. This material has an excellent cost to part life performance record for ceramic parts.
Applications include wear and heat resistant liners, mechanical and pump seals, nozzles, semiconductor equipment components, insulators, etc.
Properties Units Test Value Physical Chemical Formula Al2O3 Density, r g/cm3 ASTM C20 3.7 - 3.97 Color ivory/white Crystal Structure hexagonal Water Absorption % @ R.T. ASTM C373 0.0 Hardness Moh's 9 Hardness knoop (kg/mm2) Knoop 100g 2000 Mechanical Compressive Strength MPa @ R.T. ASTM C773 2070 - 2620 Tensile Strength MPa @ R.T. ACMA Test #4 260-300 Modulus of Elasticity
GPa ASTM C848 393 Flexural Strength (MOR) MPa @ R.T. ASTM F417 310 - 379 Poisson's Ratio, u ASTM C818 0.27 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 4.5 Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 1750 Thermal Shock Resistance DT (C) Quenching 200 Thermal Conductivity W/m-K @ R.T. ASTM C408 35 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 8.4 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.21 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 9.6 Dielectric Strength kV/mm ASTM D116 15 Electrical Resistivity Wcm @ R.T. ASTM D1829 >1014
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