Texas Biochemicals Inc, proposes to develop Polycrystalline Yttrium Aluminum Garnet (YAG) as a cost effective material to replace Sapphires for IR transparent multispectral (1-5 microns) sensor windows. We have recently developed a novel technology to produce mono-dispersed, non-agglomerated and ultra-high purity YAG nano-powders. These powders with grain growth reducing sintering additives were used to produce flat IR transparent nano-grained samples by a novel route. Preliminary results showed high stiffness (~ 330 GPa Youngs modulus), and low optical scatter due to small grain size. In the Phase-I project, we will demonstrate that the material conforms to the requirements of optical transmission, optical scatter, mechanical strength and Young's modulus. A DoD prime contractor's facilities will be used for sample evaluations, with whom we have established an on-going collaboration for the manufacture of ZnS for IR domes and windows applications. Cost estimation and a path forward to manufacture sizes needed by the US Navy will also be addressed in Phase I. On a follow-on Phase II project, we will demonstrate durability, repeatability, and fine tune the fabrication procedures for needed sizes. Collaboration with a DoD prime contractor who is highly interested in this technology will facilitate rapid insertion of the technology for commercialization.
Benefit: It is anticipated that this technology development will enable the DoD to replace costly sapphire material used for IR transparent multispectral (1-5 microns) sensor windows by this nano-grained cost effective YAG ceramic. Military applications will include transparent armor, windshields, blast shields and IR transparent windows for radomes. Commercial applications include high intensity industrial lighting, commercial laser gain products, and optical ceramics, such as high temperature envelopes for metal gas lamps. An environmental impact can also be expected, if solar concentrators can be utilized with these UV transparent window materials.
Keywords: Yttrium Aluminum Garnet, Yttrium Aluminum Garnet, nanopowders, Ceramics, Missile windows and domes., Transparent Polycrystalline YAG, Infra-red Windows, Optical , High energy lasers
