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Proceedings Paper

Comparison of hot-pressing, rate-controlled sintering, and microwave sintering of magnesium aluminate for optical applications
Author(s): Gary A. Gilde; Parimal J. Patel; Mark Patterson
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Paper Abstract

There are several crystalline materials that transmit electromagnetic radiation in the visible and IR portion of the spectrum. At this time, single-crystal sapphire, aluminum oxynitride (ALON), and spinel show promise for applications, including advanced electromagnetic windows and transparent armor. These applications require materials with high strength, hardness, and the ability to withstand high temperatures. Because of lower processing temperatures and shorter processing times, it is reasonable to assume that spinel should ultimately be less costly to produce than ALON or sapphire. Despite many attempts to commercialize spinel, it is not available today as an optical materials due to difficulties in reliably obtaining the desired transparently. To help develop a commercial source for transparent spinel, the US Army Research Laboratory and Ceramic Composites Inc. of Annapolis have signed a Cooperative Research and Development Agreement on the 'Development and Dual-Use Assessment of Transparent Spinel'. The advent of commercially available, highly pure spinel powders should lead to improvements in processing spinel to transparency. This investigation compares the advantages and limitations of hot-pressing, microwave sintering, and rate- controlled sintering and compares the limited property data available from each of these fabrication techniques.

Paper Details

Date Published: 26 July 1999
PDF: 11 pages
Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354612
Show Author Affiliations
Gary A. Gilde, U.S. Army Research Lab. (United States)
Parimal J. Patel, U.S. Army Research Lab. (United States)
Mark Patterson, Ceramic Composite, Inc. (United States)

Published in SPIE Proceedings Vol. 3705:
Window and Dome Technologies and Materials VI
Randal W. Tustison, Editor(s)

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