Spinel (MgAl2O4) is a good candidate material for transparent armor and IR window applications. Traditionally,
transparent spinel has suffered from poor strength and difficult polishing owing to its large, bimodal grain structure.
Starting from a spinel nanopowder, spinel ceramics with a grain size of less than 2 microns have been made with better
than 80% in-line transmittance at 632 nm wavelength for 3/8" thick samples. A ring-on-ring test has been used to
measure biaxial flexural strength on samples machined to 0.8 mm thickness. The average strength was found to exceed
480 MPa.
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