Properties of an Infrared-Transparent MgO:Y2O3 Nanocomposite
Abbreviated Journal Title
J. Am. Ceram. Soc.
SINGLE-CRYSTAL MGO; CERAMIC NANOCOMPOSITES; MAGNESIUM-OXIDE; THERMODYNAMIC PROPERTIES; THERMAL-CONDUCTIVITY; ELASTIC PROPERTIES; OPTICAL-MATERIALS; TEMPERATURE; YTTRIA; MICROSTRUCTURE; Materials Science, Ceramics
A 50:50vol% MgO-Y2O3 nanocomposite with similar to 150nm grain size was prepared in an attempt to make 3-5m infrared-transmitting windows with increased durability and thermal shock resistance. Flexure strength of the composite at 21 degrees C is 679MPa for 0.88cm(2) under load. Hardness is consistent with that of the constituents with similar grain size. For 3-mm-thick material at 4.85m, the total scatter loss is 1.5%, forward scatter is 0.2%, and absorptance is 1.8%. Optical scatter below 2m is 100%. Variable intensity OH absorption (similar to 6% absorptance) is observed near 3m. The refractive index is similar to 0.4% below the volume-fraction-weighted average of those of the constituents. Thermal expansion is equal to the volume-fraction-weighted average of expansion of the constituents. Specific heat capacity is equal to the mass-fraction-weighted average of heat capacities of the constituents. Thermal conductivity lies between those of the constituents up to 1200K. Elastic constants lie between those of the constituents. The Hasselman mild thermal shock resistance parameter for the composite is twice as great as that of common 3-5m window materials, but half as great as that of c-plane sapphire.
Journal of the American Ceramic Society
"Properties of an Infrared-Transparent MgO:Y2O3 Nanocomposite" (2013). Faculty Bibliography 2010s. 4086.