Comparison of hot-pressing, rate-controlled sintering, and microwave sintering of magnesium aluminate for optical applications

Gary A. Gilde; Parimal J. Patel; Mark Patterson

doi:10.1117/12.354612

26 July 1999 Comparison of hot-pressing, rate-controlled sintering, and microwave sintering of magnesium aluminate for optical applications

Gary A. Gilde, Parimal J. Patel, Mark Patterson

Author Affiliations +

Proceedings Volume 3705, Window and Dome Technologies and Materials VI; (1999) https://doi.org/10.1117/12.354612
Event: AeroSense '99, 1999, Orlando, FL, United States

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.

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Gary A. Gilde, Parimal J. Patel, and Mark Patterson "Comparison of hot-pressing, rate-controlled sintering, and microwave sintering of magnesium aluminate for optical applications", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); https://doi.org/10.1117/12.354612

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