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Properties of an Infrared‐Transparent MgO : Y 2 O 3 Nanocomposite
Author(s) -
Harris Daniel C.,
Cambrea Lee R.,
Johnson Linda F.,
Seaver Robert T.,
Baronowski Meghan,
Gentilman Richard,
Scott Nordahl C.,
Gattuso Todd,
Silberstein Stephanie,
Rogan Patrick,
Hartnett Thomas,
Zelinski Brian,
Sunne Wayne,
Fest Eric,
Howard Poisl W.,
Willingham Charles B.,
Turri Giorgio,
Warren Cori,
Bass Michael,
Zelmon David E.,
Goodrich Steven M.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12589
Subject(s) - thermal expansion , volume fraction , composite number , materials science , thermal shock , nanocomposite , composite material , analytical chemistry (journal) , refractive index , thermal conductivity , absorptance , grain size , microstructure , volume (thermodynamics) , infrared , absorption (acoustics) , mass fraction , chemistry , optics , thermodynamics , chromatography , reflectivity , physics , optoelectronics
A 50:50 vol% MgO – Y 2 O 3 nanocomposite with ~150 nm grain size was prepared in an attempt to make 3–5 μm infrared‐transmitting windows with increased durability and thermal shock resistance. Flexure strength of the composite at 21°C is 679 MPa for 0.88 cm 2 under load. Hardness is consistent with that of the constituents with similar grain size. For 3‐mm‐thick material at 4.85 μm, the total scatter loss is 1.5%, forward scatter is 0.2%, and absorptance is 1.8%. Optical scatter below 2 μm is 100%. Variable intensity OH absorption (~6% absorptance) is observed near 3 μm. The refractive index is ~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 1200 K. 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 3–5 μm window materials, but half as great as that of c ‐plane sapphire.