Paper
27 April 2009 High-strength transparent spinel with fine, unimodal grain size
S. M. Sweeney, M. K. Brun, T. J. Yosenick, A. Kebbede, M. Manoharan
Author Affiliations +
Abstract
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.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. M. Sweeney, M. K. Brun, T. J. Yosenick, A. Kebbede, and M. Manoharan "High-strength transparent spinel with fine, unimodal grain size", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 73020G (27 April 2009); https://doi.org/10.1117/12.821193
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Cited by 6 scholarly publications.
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KEYWORDS
Spinel

Polishing

Ceramics

Transmittance

Scanning electron microscopy

Glasses

Photomicroscopy

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