Submicron-grained transparent yttria composites

Bernard H. Kear; Rajendra Sadangi; Vijay Shukla; Todd Stefanik; Richard Gentilman

doi:10.1117/12.602333

18 May 2005 Submicron-grained transparent yttria composites

Bernard H. Kear, Rajendra Sadangi, Vijay Shukla, Todd Stefanik, Richard Gentilman

Proceedings Volume 5786, Window and Dome Technologies and Materials IX; (2005) https://doi.org/10.1117/12.602333
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

New materials with improved mechanical properties and high optical transmission in the full 3-5 micron MWIR region wavelength are required. Commercially available polycrystalline transparent Yttria, with >100 micron average grain size, does not perform satisfactorily in demanding applications because of its modest strength. One way to improve strength is to develop an ultra-fine grained material with acceptable optical transmission properties. To realize fine grains it is necessary to use other phases to inhibit grain growth during fabrication. A promising processing method comprises: (a) synthesis of an extended metastable solid solution by plasma melting and quenching, and (b) consolidation of the metastable ceramic powder to form dense submicron-grained (<1 micron) composites. Two ceramic composites containing 20 and 50 vol% of second phase are evaluated in this study. Optical transmission, hardness, and indentation fracture toughness are measured and correlated with structure.

Citation Download Citation

Bernard H. Kear, Rajendra Sadangi, Vijay Shukla, Todd Stefanik, and Richard Gentilman "Submicron-grained transparent yttria composites", Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); https://doi.org/10.1117/12.602333

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