High-strength transparent spinel with fine, unimodal grain size

S. M. Sweeney; M. K. Brun; T. J. Yosenick; A. Kebbede; M. Manoharan

doi:10.1117/12.821193

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

Proceedings Volume 7302, Window and Dome Technologies and Materials XI; 73020G (2009) https://doi.org/10.1117/12.821193
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

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.

Citation Download Citation

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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