Methods of forming aluminum oxynitride-comprising bodies, including methods of forming a sheet of transparent armor
AssigneeBattelle Energy Alliance, LLC
InventorsHenry Shiu-Hung Chu, Thomas Martin Lillo
Life of this patent
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Abstract
The invention includes methods of forming an aluminum oxynitride-comprising body. For example, a mixture is formed which comprises A:B:C in a respective molar ratio in the range of 9:3.6-6.2:0.1-1.1, where “A” is Al2O3, “B” is AlN, and “C” is a total of one or more of B2O3, SiO2, Si—Al—O—N, and TiO2. The mixture is sintered at a temperature of at least 1,600° C. at a pressure of no greater than 500 psia effective to form an aluminum oxynitride-comprising body which is at least internally transparent and has at least 99% maximum theoretical density.
Claims50
A method of forming an aluminum oxynitride-comprising body, comprising:
- forming a mixture comprising A:B:C in a respective molar ratio in the range of 9:3.6-6.2:0.1-1.1, where “A” is Al2O3, “B” is AlN, and “C” is a total of one or more of B2O3, SiO2, Si—Al—O—N, and TiO2;
- and
- sintering the mixture at a temperature of at least 1,600° C., at a pressure of no greater than 500 psia effective to form an aluminum oxynitride-comprising body which is at least internally transparent and has at least 99% maximum theoretical density.
A method of forming an aluminum oxynitride-comprising body, comprising:
- forming a mixture comprising A:B:C in a respective molar ratio in the range of 9:3.6-6.2:0.1-1.1, where “A” is Al2O3, “B” is AlN, and “C” is a total of one or more of B2O3, SiO2, Si—Al—O—N, and TiO2;
- forming the mixture into a mass of desired shape having density that is at least 55% maximum theoretical density;
- and
- isostatically sintering the mass at a temperature of at least 1,600° C., at a pressure of no greater than 20 psia effective to form an aluminum oxynitride-comprising body which is at least internally transparent and has at least 99% maximum theoretical density.
A method of forming a transparent aluminum oxynitride-comprising body, comprising:
- forming a mixture comprising A:B:C in a respective molar ratio in the range of 9:3.6-6.2:0.1-1.1, where “A” is Al2O3, “B” is AlN, and “C” is a total of one or more of B2O3, SiO2, Si—Al—O—N, and TiO2;
- forming the mixture into a mass of desired shape;
- sintering the mass at a temperature of at least 1,600° C., at a pressure of no greater than 500 psia effective to transform the mass into an aluminum oxynitride-comprising body which is at least 99% maximum theoretical density, which is internally transparent, and which comprises at least two opposing outer surfaces which are not transparent;
- and
- polishing the two opposing outer surfaces to render the body transparent through the two opposing outer surfaces.
A method of forming a sheet of transparent ceramic armor, comprising:
- forming a mixture comprising A:B:C in a respective molar ratio in the range of 9:3.6-6.2:0.1-1.1, where “A” is Al2O3, “B” is AlN, and “C” is a total of one or more of B2O3, SiO2, Si—Al—O—N, and TiO2;
- forming the mixture into a sheet;
- isostatically sintering the sheet at a temperature of at least 1,600° C., at a pressure of no greater than 500 psia effective to form an aluminum oxynitride-comprising sheet which is at least 99% maximum theoretical density, which is internally transparent, and which comprises two opposing major outer sheet surfaces which are not transparent;
- and
- polishing the two opposing major outer sheet surfaces to render the sheet transparent through the two opposing major outer sheet surfaces.
Dependencies are inferred from the claim text.