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Proceedings Paper

High-strength transparent spinel with fine, unimodal grain size
Author(s): S. M. Sweeney; M. K. Brun; T. J. Yosenick; A. Kebbede; M. Manoharan
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Paper 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.

Paper Details

Date Published: 27 April 2009
PDF: 6 pages
Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 73020G (27 April 2009); doi: 10.1117/12.821193
Show Author Affiliations
S. M. Sweeney, GE Global Research (United States)
M. K. Brun, GE Global Research (United States)
T. J. Yosenick, GE Global Research (United States)
A. Kebbede, GE Global Research (United States)
M. Manoharan, GE Global Research (United States)

Published in SPIE Proceedings Vol. 7302:
Window and Dome Technologies and Materials XI
Randal W. Tustison, Editor(s)

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