Ceramic Properties - Silicon Nitride
Silicon Nitride has the strongest covalent bond properties next to silicon carbide. It is used as a high temperature structural ceramic due to superior heat resistance, strength, and hardness. The wear and corrosion resistance are excellent. There are various types available (Sintered, CVD, HP) for different purposes using ceramic parts.
Main applications include heat exchangers, rotors, nozzles, bearings, valves, chemical plant parts, engine components, and armor.
Properties Units Test Value Physical Chemical Formula Si3N4 Density, r g/cm3 ASTM C20 3.31 Color dark gray Crystal Structure
hexagonal (alpha & beta)
Water Absorption % @R.T. ASTM C373 0.0 Hardness Moh's 9 Hardness knoop (kg/mm2) Knoop 100g 2200 Mechanical Compressive Strength MPa @ R.T. ASTM C773 689-2760 Tensile Strength MPa @ R.T. ACMA Test #4 360-434 Modulus of Elasticity
GPa ASTM C848 317 Flexural Strength (MOR) MPa @ R.T. ASTM F417 679-896 Poisson's Ratio, u ASTM C818 0.23 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 5.0-8.0 Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 1500 Thermal Shock Resistance DT (C) Quenching 750 Thermal Conductivity W/m-K @ R.T. ASTM C408 27 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 3.4 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.17 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 7.0 Dielectric Strength kV/mm ASTM D116 17.7 Electrical Resistivity Wcm @ R.T. ASTM D1829 1013
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