CPC C04B 35/581 (2013.01) [C04B 35/62695 (2013.01); C04B 35/645 (2013.01); C04B 35/65 (2013.01); C09K 11/02 (2013.01); C09K 11/77348 (2021.01); B28B 1/30 (2013.01); B28B 3/02 (2013.01); C04B 2235/3865 (2013.01); C04B 2235/3869 (2013.01); C04B 2235/402 (2013.01); C04B 2235/5427 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/656 (2013.01)] | 20 Claims |
1. A method for forming an aluminum-containing nitride ceramic matrix composite, comprising:
forming at least one green body comprising a phosphor powder and an aluminum-containing composition, wherein
the at least one green body is characterized by a porosity between about 10% and about 80%, and
the phosphor powder comprises at least one phosphor composition, and phosphor powder particles have a D50 diameter between about 100 nanometers and about 500 micrometers; and
heating a sealable container to a temperature between about 400 degrees Celsius and about 800 degrees Celsius and a pressure between about 10 MPa and about 1000 MPa,
wherein
the at least one green body, ammonia, and a mineralizer composition are disposed within the sealable container before heating and pressurizing the sealable container,
the aluminum-containing composition has a purity, on a metals basis, between about 90% and about 99.9999%,
the fraction of free volume within the sealable container that is filled with liquid ammonia is between about 10% and about 95% before heating and pressurizing the sealable container, and
the heating the sealable container comprises heating the sealable container for a first period of time to form the aluminum-containing nitride ceramic matrix composite characterized by a phosphor-to-aluminum nitride (AlN) ratio, by volume, between about 1% and about 99%, by a porosity between about 1% and about 50%, and by a thermal conductivity between about 1 watt per meter-Kelvin and about 320 watts per meter-Kelvin.
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