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Proceedings Paper

Synthesis and processing of nanocrystalline powders for IR transparent windows
Author(s): Mohit Jain; Ganesh Skandan; Amit Singhal; Dinesh Agrawal; Yi Feng; Joseph La Monica; J. Kirsch
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Paper Abstract

Polycrystalline infrared transparent materials with good optical and mechanical properties are needed for the fabrication of infrared windows and domes. We have developed a synthesis process to produce MgO nanopowders. The average aggregate size of powder is in the range of 150 - 160 nm, with a narrow aggregate size distribution. Additionally, a protocol for compaction of nanocrystalline powders to achieve high green density (>50% of theoretical density) and microstructural uniformity has been described, as these factors are critical to sinter compacts to theoretical density with minimum number of flaws. Some of the samples were hot pressed and subsequently hot isostatically pressed (HIPed) for complete densification. Processing parameters are discussed to achieve uniformly dense sample with high degree of translucency. Some of the fully densified samples had a grain size as low as 100 - 300 nm.

Paper Details

Date Published: 18 May 2005
PDF: 10 pages
Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); doi: 10.1117/12.604433
Show Author Affiliations
Mohit Jain, NEI Corp. (United States)
Ganesh Skandan, NEI Corp. (United States)
Amit Singhal, NEI Corp. (United States)
Dinesh Agrawal, The Pennsylvania State Univ. (United States)
Yi Feng, The Pennsylvania State Univ. (United States)
Joseph La Monica, Air Force Research Lab. (United States)
J. Kirsch, U.S. Army Aviation and Missile Command (United States)

Published in SPIE Proceedings Vol. 5786:
Window and Dome Technologies and Materials IX
Randal W. Tustison, Editor(s)

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