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US 7,811,496 B2Granted
Methods of making ceramic particles
Assignee3M Innovative Properties Company
InventorsAhmet Celikkaya, Thomas J. Anderson
Life of this patent
Estimating the term…
Abstract
Method for making ceramic particles. Embodiments of ceramic particles made according to the present invention can be are particularly useful as abrasive particles.
Claims73
A method for making ceramic particles, the method comprising:
- providing first and second generally opposed surfaces;
- providing a mold comprising a plurality of at least one of particle openings or cavities;
- introducing a melt to at least a portion of the plurality of at least one of the particle openings or cavities of the mold, the melt comprising at least 35 percent by weight Al2O3, based on the total weight of the melt, and a first metal oxide other than Al2O3 wherein the melt contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the melt;
- passing the mold and the melt between the first and second generally opposed surface under pressure such that the melt in the at least one of the particle openings or cavities is under pressure;
- and
- at least partially cooling the melt in the at least one of the particle openings or cavities to provide ceramic particles comprising glass, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, and a first metal oxide other than Al2O3, wherein the glass contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass.
3 more elements
A method for making ceramic particles, the method comprising:
- providing a roll comprising a plurality of particle cavities;
- introducing a melt to at least a portion of the plurality of particle cavities, the melt comprising at least 35 percent by weight Al2O3, based on the total weight of the melt, and a first metal oxide other than Al2O3, wherein the melt contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the melt;
- and
- at least partially cooling the melt in the particle cavities to provide ceramic particles comprising glass, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, and a first metal oxide other than Al2O3, wherein the glass contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TcO2, and V2O5, based on the total weight of the glass;
- and
- contacting a surface to the melt in the cavities such that the melt in the cavities is under pressure.
3 more elements
A method for making ceramic particles, the method comprising:
- providing first and second generally opposed surfaces;
- providing a mold comprising a plurality of at least one of particle openings or cavities;
- introducing a melt to at least a portion of the plurality of at least one of the particle openings or cavities of the mold,
- passing the mold and the melt between the first and second generally opposed surface under pressure such that the melt in the at least one of particle the openings or cavities is under pressure;
- at least partially cooling the melt in the at least one of the particle openings or cavities to provide ceramic particles comprising glass;
- and
- heat-treating the ceramic particles to convert at least a portion of the glass to glass-ceramic particles, wherein the glass-ceramic has an average hardness of at least 13 GPa.
4 more elements
A method for making ceramic particles, the method comprising:
- providing a roll comprising a plurality of particle cavities;
- introducing a melt to at least a portion of the plurality of particle cavities;
- at least partially cooling the melt in the particle cavities to provide ceramic particles comprising glass;
- and
- heat-treating the ceramic particles to convert at least a portion of the glass to glass-ceramic particles, wherein the glass-ceramic has an average hardness of at least 13 GPa.
2 more elements
A method for making ceramic particles, the method comprising:
- providing a roll comprising a plurality of particle openings, wherein the roller has an inner major surface and an outer major surface, and wherein the particle openings extend between the outer major surface and the inner major surface;
- introducing a melt to at least a portion of the plurality of particle openings, the melt comprising at least 35 percent by weight Al2O3, based on the total weight of the melt, and a first metal oxide other than Al2O3, wherein the melt contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the melt;
- and
- at least partially cooling the melt in the particle openings to provide ceramic particles comprising glass, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, and a first metal oxide other than Al2O3 wherein the glass contains not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass.
1 more element
A method for making ceramic particles, the method comprising:
- providing a roll comprising a plurality of particle openings, wherein the roller has an inner major surface and an outer major surface, and wherein the particle openings extend between the outer major surface to the inner major surface;
- introducing a melt to at least a portion of the plurality of particle openings;
- at least partially cooling the melt in the particle openings to provide ceramic particles comprising glass;
- and
- heat-treating the ceramic particles to convert at least a portion of the glass to glass-ceramic particles, wherein the glass-ceramic has an average hardness of at least 13 GPa.
2 more elements
Dependencies are inferred from the claim text.