HARD ALUMINUM OXIDE COATING FOR VARIOUS APPLICATIONS
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United States of America Patent
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Jan 12, 2017
app pub date -
Jul 9, 2015
filing date -
Jul 9, 2015
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Abstract
A structure for a hardened optically transmissive material including a hard coating is provided. The structure for the hardened optically transmissive material including the hard coating includes a substrate, and an aluminum oxide film disposed over the substrate, wherein the aluminum oxide film is grown to between 100 nanometers (nm) and 5 microns (um). The aluminum oxide film demonstrates a hardness greater than 10 gigapascals (GPa) as measured by nanoindentation, and the aluminum oxide film exhibits a transparency value such that at least 84 percent of light waves transmit through the aluminum oxide film for light waves within a range of wavelengths.
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