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US 4,520,116 AGranted
Transparent aluminum oxynitride and method of manufacture
AssigneeRaytheon Company
InventorsRichard L. Gentilman, Edward A. Maguire, Leonard E. Dolhert
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AssigneeRaytheon Company
InventorsRichard L. Gentilman, Edward A. Maguire, Leonard E. Dolhert
Estimating the term…
An article of manufacture is provided comprising a polycrystalline cubic aluminum oxynitride having a density of at least 98% of theoretical density, and being transparent to electromagnetic radiation in the wavelength range from 0.3 to 5 micrometers with an in-line transmission of at least 20% in this range. A method of preparing the optically transparent aluminum oxynitride is also provided comprising the steps of forming a green body of substantially homogeneous aluminum oxynitride powder and pressureless sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron and yttrium in elemental or compound form.
A body of polycrystalline cubic aluminum oxynitride having a density greater than 97.2% of theoretical density, a sample of said body having an in-line transmission of at least 20% in the wavelength range of 0.3-5 microns said sample having a thickness of 1.90 millimeters.
A body of polycrystalline doped cubic aluminum oxynitride material having a density greater than 97.2%, a sample of said body having an in-line transmission of at least 20% in the 0.3-5 micron wavelength range, said sample having a thickness of 1.90 millimeters.
A body of polycrystalline cubic aluminum oxynitride having a density greater than 99% of theoretical density.
A body of polycrystalline doped cubic aluminum oxynitride having a density greater than 99% of theoretical density.
Dependencies are inferred from the claim text.