Transparent Ceramic spinel MgAl2O4

Transparent Ceramic spinelIntrodctionTransparent ceramic spinel (Transparent Magnesium Aluminate spinel, MgAl2O4 transparent spinel, MA polycrystalline spinel) is an attractive material for uses in a wide range of optical, electronic and structural applications including windows and lenses, which require excellent transmission from the visible through to the mid IR. Theoretical transmission is very uniform and approaches 87% between 0.3 to 5 microns. Transmission characteristics rival that of ALON and sapphire in the mid-wave IR, making it especially attractive for the ever-increasing performance requirements of current and next-generation IR imaging systems. Physical propertiesPropertiesValuePropertiesValueDensity3.58g/cm3Thermal conductivity15w/m · kMelting point2135Thermal expansion7.3X10-6/Knoop hardness1150kg/mm2Dielectric constant8.2Yangmodulus190GPaRefractive index(0.4-5.0μm)1.736-1.659Crystal structureCubicCompressionStrength500MPaTransmission(0.3-5.0μm)80-87%Flexural strength140MPa