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Nanostructured, Infrared‐Transparent Magnesium‐Aluminate Spinel with Superior Mechanical Properties
Author(s) -
Mroz Thomas,
Goldman Lee M.,
Gledhill Andrew D.,
Li Dongsheng,
Padture Nitin P.
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02629.x
Subject(s) - spinel , materials science , grain size , sintering , aluminate , infrared , thermal shock , weibull modulus , magnesium , ceramic , mineralogy , composite material , metallurgy , optics , physics , cement , chemistry
Here, we show that nanostructured magnesium‐aluminate spinel (MgAl 2 O 4 ) with a highly uniform grain‐size distribution can be fabricated using Y 2 O 3 sintering additive for infrared (IR) window/dome applications. The average grain size of this nanostructured spinel is 345 nm, and the size of the largest grain is 970 nm. As a consequence this nanostructured spinel has high room‐temperature strength (470 MPa) and reliability (Weibull modulus 6.2). It also has improved erosion resistance (sand and rain) and thermal‐shock resistance. Near‐theoretical in‐line IR transmission is observed in this nanostructured spinel at room temperature, with an optical scatter of <0.2/cm at 3.39 μm wavelength.