2 May 2007 Spark plasma sintering and forming of transparent polycrystalline Al2O3 windows and domes
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Abstract
Spark plasma sintering(SPS) method was used to produce transparent alumina and it proved to be a cost-effective method due to short processing cycle. It was found that the optical transmittance of alumina is greatly influenced by SPS sintering parameters. A maximum transmittance of 85% has been achieved by sintering at 1300°C for 5min. Annealing in air at 1250°C for 24h significanly increased mid-infrared transmission. Utilizing SPS, transparent polycrystalline alumina domes have been successfully produced by combining sintering and forming into one step in minutes instead of hours needed when using conventional methods. This is a near-net-shape forming method such that only a minor amount of machining or polishing is needed. The present forming method provides an unprecedented opportunity to make optically transparent domes at much lower costs.
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Dongtao Jiang, Dongtao Jiang, Dustin M. Hulbert, Dustin M. Hulbert, Umberto Anselmi-Tamburini, Umberto Anselmi-Tamburini, Terry Ng, Terry Ng, Donald Land, Donald Land, Amiya K. Muhkerjee, Amiya K. Muhkerjee, } "Spark plasma sintering and forming of transparent polycrystalline Al2O3 windows and domes", Proc. SPIE 6545, Window and Dome Technologies and Materials X, 654509 (2 May 2007); doi: 10.1117/12.730861; https://doi.org/10.1117/12.730861
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