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AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsThomas Hutzler, Andreas Krell
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Transparent spinel ceramics, as they can be used, for example, as protective ceramics, and to a method for the production thereof. Transparent spinel ceramics which preferably contain no visible defects and which have an in-line transmission of more than 82% in wavelength ranges of infrared light, measured between 1000 nm and 2500 nm, at sample thicknesses≧3 mm. Spinel ceramics transparent in wavelength ranges of infrared light which are composed of sintered magnesium aluminum spinel having an average structural grain size of ≦10 μm and having maximally 0.5 mass % overall of homogeneously distributed additives of calcium and/or strontium and/or barium which are present in a concentration, expressed respectively as an oxide, of 0.005 to <0.2 mass % CaO and/or 0.005 to <0.5 mass % SrO and/or 0.005 to <0.5 mass % BaO.
Spinel ceramics which are transparent in wavelength ranges of infrared light, composed of sintered magnesium aluminum spinel having an average structural grain size of ≦10 μm and having maximally 0.5 mass % overall of homogeneously distributed additives of calcium and/or strontium and/or barium which are present in a concentration, expressed respectively as an oxide, of 0.005 to <0.2 mass % CaO and/or 0.005 to <0.5 mass % SrO and/or 0.005 to <0.5 mass % BaO.
Spinel ceramics which are transparent in wavelength ranges of visible light, composed of sintered magnesium aluminum spinel having an average structural grain size of ≦10 μm and having maximally 0.3 mass % overall of homogeneously distributed additives of calcium and/or strontium and/or barium which are present in a concentration, expressed respectively as an oxide, of 0.005 to <0.2 mass % CaO and/or 0.005 to <0.3 mass % SrO and/or 0.005 to <0.25 mass % BaO.
Spinel ceramics which are transparent in wavelength ranges of infrared light, composed of sintered magnesium aluminum spinel having an average structural grain size of ≦10 μm and having maximally 0.5 mass % overall of homogeneously distributed additives of calcium and/or strontium and/or barium which are present in a concentration, expressed respectively as an oxide, of 0.005 to <0.2 mass % CaO and/or 0.005 to <0.5 mass % SrO and/or 0.005 to <0.5 mass % BaO, and
Spinel ceramics which are transparent in wavelength ranges of visible light, composed of sintered magnesium aluminum spinel having an average structural grain size of ≦10 μm and having maximally 0.3 mass % overall of homogeneously distributed additives of calcium and/or strontium and/or barium which are present in a concentration, expressed respectively as an oxide, of 0.005 to <0.2 mass % CaO and/or 0.005 to <0.3 mass % SrO and/or 0.005 to <0.25 mass % BaO, and
Dependencies are inferred from the claim text.