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AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsAndreas Krell, Thomas Hutzler
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Transparent polycrystalline sintered ceramic of cubic crystal structure. The invention relates to the field of technical ceramic and relates to transparent polycrystalline sintered ceramics of cubic crystal structure for applications with increased mechanical stress, e.g., as protective or armoring ceramic. Provided are sintered ceramics that combine a high transmission of RIT>75% of the theoretical maximum value with a distinctly improved hardness. Transparent polycrystalline sintered ceramics of cubic crystal structure with a real in-line transmission RIT>75% of the theoretical maximum value measured on 0.8 mm-thick polished plates and for light of a wavelength between 600 and 650 nm, and with an average grain size D in the range of 60 nm<D<10 μm are provided.
Transparent polycrystalline sintered ceramic composed of Mg—Al spinel, Al oxynitride, ZrO2, Y2O3 or Y—Al garnet, or of a mixed structure of these components, of cubic crystal structure, comprising a real in-line transmission RIT>75% of the theoretical maximum value measured on 0.8 mm-thick polished plates and for light of a wavelength between 600 and 650 nm, and
Dependencies are inferred from the claim text.