Ceramic Properties - Macor
Macor is a machinable glass ceramic parts material offering many advantageous properties, including high use temperature, excellent insulating properties (electrical and thermal), and dimensional stability. It can be polished, machined to tight tolerances, tapped, sealed, and metallized.
It can be used in many of the same applications where alumina is used and the extreme high temperature and wear characteristics of alumina are not necessary.
Properties Units Test Value Physical Chemical Formula glass ceramic Density, r g/cm3 ASTM C20 2.52 Color white Crystal Structure random Water Absorption % @R.T. ASTM C373 0.0 Hardness Moh's 4.5 Hardness knoop (kg/mm2) Knoop 100g 250 Mechanical Compressive Strength MPa @ R.T. ASTM C773 345 Tensile Strength MPa @ R.T. ACMA Test #4 90 Modulus of Elasticity
GPa ASTM C848 66.9 Flexural Strength (MOR) MPa @ R.T. ASTM F417 94 Poisson's Ratio, u ASTM C818 0.29 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 1.53 Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 1000 Thermal Shock Resistance DT (C) Quenching 25 - 100 Thermal Conductivity W/m-K @ R.T. ASTM C408 1.8 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 6.3 - 9.7 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.19 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 6.03 Dielectric Strength kV/mm ASTM D116 40 Electrical Resistivity Wcm @ R.T. ASTM D1829 >1017
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