Advanced Optical Ceramics
Quarterly research and development status rept. no. 3, 1 Dec 1978-28 Feb 1979 on Phase 1
GENERAL ELECTRIC CO PHILADELPHIA PA RE-ENTRY SYSTEMS DEPT
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The objective of this study is to identify and develop revolutionary advanced material suitable for electro-opticalelectro-magnetic EOEM windows, IR dome and radomes capable of meeting mission requirements anticipated for the 1990 decade and beyond. Experimental work was directed at synthesis and characterization of the candidate window materials. The toughness enhancement study and the optical modelling continue to indicate the feasibility of toughening of optical materials. In conjunction with known equilibria data, identification was made of the most feasible toughened systems for windowas and enclosures. The most interesting candidates in this category are a cubic stabilized ZrO2 unstabilized ZrO2 b A1203-Cr203 solid solution unstabilized ZrO2, because in both of these cases the index of refraction of the second phase particle is anticipated to match closely that of the matrix. A systematic evaluation of potential new candidates was made and a theory for prediction of low coefficient of thermal expansion crystals was developed. This study indentified, among others, the Beta sialon ceramics as an important category.
- Ceramics, Refractories and Glass
- Infrared Detection and Detectors