Abstract
This UCF invention introduces a novel approach to strengthen multispectral zinc sulfide (MS-ZnS) optical ceramics without compromising their broadband transparency. By incorporating gallium through vapor transport deposition (VTD) or diffusion coupling (DC), the hardness of MS-ZnS windows can be increased by up to 120%. Given the growing demand for durable optical materials in extreme environments, improving mechanical resilience while preserving optical performance is critical. This invention addresses that challenge by enabling crack-free, high-strength MS-ZnS suitable for demanding applications such as infrared imaging and defense systems.
Technical Details: Two methods were developed: VTD, which transports gallium vapor to the ZnS surface, and DC, which bonds a Ga-containing pellet to ZnS for controlled diffusion. Both methods maintain the sphalerite phase and broadband transmission (0.4–14 µm). Microhardness improved up to 3.8 GPa (120% increase) with Ga concentrations below 5 at.% to avoid phase transformation. Crack prevention strategies include sulfurization during VTD and stepwise Ga incorporation in DC. Characterization involved SIMS for Ga profiling, XRD for phase analysis, FTIR for transmission, and Vickers hardness testing
Benefit
Enhanced Durability: Up to 120% increase in hardness for MS-ZnS windows.Maintained Transparency: Preserves broadband optical transmission.Crack-Free Design: Modified processes prevent structural failure.Scalable Approach: Techniques adaptable for large optical components.Market Application
Defense and Aerospace: Infrared windows for missiles, aircraft, and sensors.Industrial Imaging: Durable optics for harsh manufacturing environments.Space Exploration: High-strength windows for extreme thermal and mechanical loads.Security and Surveillance: Enhanced IR systems for outdoor and rugged conditions.
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