Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 11, Pages 2869-2886Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.02.051
Keywords
Sintering; Grain size; Defects; Optical properties; Spinel
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Efforts were and are made to develop performant fabrication technologies, for transparent polycrystalline spinet - a material used for armor, infrared windows and other products. Significant progress was made - during some fifty years of research - regarding the understanding of the structure of spinet, at various scales, and the best ways to correlate processing with the relevant structural features so as to improve properties. This review compiles and comments the results of this progress, using as sources the literature and the author's own work. As of now the best specimens obtained combine submicron grains with an optical transmission close to the theoretical and a Vickers hardness of 15 GPa (size <= 25 cm). Larger plates, more than 0.5 m in size, but with coarse microstructure and lower hardness, have also been produced, together with quite large dome shaped parts, exhibiting highly uniform optical properties. (C) 2012 Elsevier Ltd. All rights reserved.
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