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Ceramic Properties - Cordierite
<This is mainly a structural ceramic, often used for kiln furniture due to its extremely good thermal shock resistance. Like other structural ceramic materials, it also has good thermal and electrical insulating capabilities.
Properties Units Test Value Physical Chemical Formula 2MgO-2Al2O3-5SiO2 Density, r g/cm3 ASTM C20 2.60 Color tan Crystal Structure orthorhombic Water Absorption % @R.T. ASTM C373 0.02 - 3.2 Hardness Moh's 7 Hardness knoop (kg/mm2) Knoop 100g -- Mechanical Compressive Strength MPa @ R.T. ASTM C773 350 Tensile Strength MPa @ R.T. ACMA Test #4 25.5 Modulus of Elasticity
(Young's Mod.)GPa ASTM C848 70 Flexural Strength (MOR) MPa @ R.T. ASTM F417 117 Poisson's Ratio, u ASTM C818 0.21 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test -- Thermal Max. Use Temperature
(* denotes inert atm.)C No load cond. 1371 Thermal Shock Resistance DT (C) Quenching 500 Thermal Conductivity W/m-K @ R.T. ASTM C408 3.0 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 1.7 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.35 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 4.7 Dielectric Strength kV/mm ASTM D116 5.11 Electrical Resistivity Wcm @ R.T. ASTM D1829 1014
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