A sol-gel method was successfully used to synthesize Y2O3-MgO composite powder with a grain size below 30nm.
Results from X-ray diffraction revealed how the microstructure evolved with increasing heat treating temperature.
Taking advantage of high heating rate, spark plasma sintering (SPS) technique was used to sinter the nanopowder,
resulting in a fully dense nanocomposite with grain size below 100nm. The transmittance can be enhanced by optimizing
sintering parameters as well as appropriate post-sinter annealing. The fully consolidated nanocomposite exhibits an
optical transmittance between 75% and 84% over infrared wavelength range between 3μm and 6μm. This kind of
nanocomposite has a great potential to be used as infrared transparent material.
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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