Compound transparent ceramics and methods of preparation thereof
First Claim
1. A method for forming a composite transparent ceramic preform, the method comprising:
- forming a first suspension of oxide particles in a first solvent, wherein the first suspension includes a first dispersant, with the proviso that the first suspension does not include a gelling agent;
adding the first suspension to a first mold of a desired shape;
uniformly curing the first suspension in the first mold until stable;
forming a second suspension of oxide particles in a second solvent, wherein the second suspension includes a second dispersant, with the proviso that the second suspension does not include a gelling agent;
adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension and the second suspension;
uniformly curing the second suspension in the second mold until stable.
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Abstract
According to one embodiment, a method for forming a composite transparent ceramic preform includes forming a first suspension of oxide particles in a first solvent which includes a first dispersant but does not include a gelling agent, adding the first suspension to a first mold of a desired shape, and uniformly curing the first suspension in the first mold until stable. The method also includes forming a second suspension of oxide particles in a second solvent which includes a second dispersant but does not include a gelling agent, adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension and the second suspension, and uniformly curing the second suspension in the second mold until stable. Other methods for forming a composite transparent ceramic preform are also described according to several other embodiments. Structures are also disclosed.
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Citations
37 Claims
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1. A method for forming a composite transparent ceramic preform, the method comprising:
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forming a first suspension of oxide particles in a first solvent, wherein the first suspension includes a first dispersant, with the proviso that the first suspension does not include a gelling agent; adding the first suspension to a first mold of a desired shape; uniformly curing the first suspension in the first mold until stable; forming a second suspension of oxide particles in a second solvent, wherein the second suspension includes a second dispersant, with the proviso that the second suspension does not include a gelling agent; adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension and the second suspension; uniformly curing the second suspension in the second mold until stable. - View Dependent Claims (2, 10, 11, 13, 14, 15, 16, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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3. A method for forming a composite transparent ceramic preform, the method comprising:
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forming a first suspension of oxide particles in a first solvent, wherein the first suspension includes a first dispersant, with the proviso that the first suspension does not include a gelling agent; adding the first suspension to a first mold of a desired shape; uniformly curing the first suspension in the first mold until stable; forming a second suspension of oxide particles in a second solvent, wherein the second suspension includes a second dispersant, with the proviso that the second suspension does not include a gelling agent; adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension and the second suspension; and uniformly curing the second suspension in the second mold until stable. wherein the oxide particles have a primary particle diameter of between about 10 nm and about 80 nm. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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12. A method for forming a composite transparent ceramic preform, the method comprising:
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forming a first suspension of oxide particles in a first solvent, wherein the first suspension includes a first dispersant, with the proviso that the first suspension does not include a gelling agent; adding the first suspension to a first mold of a desired shape; uniformly curing the first suspension in the first mold until stable; forming a second suspension of oxide particles in a second solvent, wherein the second suspension includes a second dispersant, with the proviso that the second suspension does not include a gelling agent; adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension, and the second suspension; uniformly curing the second suspension in the second mold until stable; wherein the curing the first suspension and the second suspension comprises; heating the first suspension in the first mold and the second suspension in the second mold to a temperature of between about 20°
C. and about 80°
C., andholding the temperature about constant for a time of between about 4 hours and about 72 hours; and calcining at least one of the cured first suspension and the cured second suspension at a temperature of between about 500°
C. and about 1100°
C.
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17. A method, comprising:
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forming a first suspension of oxide particles in a first solvent, wherein the first suspension includes a first dispersant, with the proviso that the first suspension does not include a gelling agent; agitating the first suspension; adding the first suspension to a first mold of a desired shape; uniformly drying the first suspension in the first mold until stable; forming a second suspension of oxide particles in a second solvent, wherein the second suspension includes a second dispersant, with the proviso that the second suspension does not include a gelling agent; agitating the second suspension; adding the second suspension to the stable first suspension in a second mold of a desired shape encompassing the first suspension and the second suspension; curing the first suspension and the second suspension in the second mold at a temperature of between about 20°
C. and about 80°
C. until stable. - View Dependent Claims (18, 35, 36, 37)
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Specification