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US 7,175,786 B2Granted
Methods of making Al2O3-SiO2 ceramics
Assignee3M Innovative Properties Company
InventorsAhmet Celikkaya, Thomas J. Anderson
Life of this patent
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Abstract
Methods for making glasses and glass-ceramics comprising Al2O3 and SiO2. Glasses made according to the present invention can be made, formed as, or converted into glass beads, articles (e.g., plates), fibers, particles, and thin coatings. Some embodiments of glass-ceramic particles made according to the present invention can be are particularly useful as abrasive particles.
Claims37
A method for making glass, the method comprising:
- feeding at least Al2O3 source and particulate SiO2 source into one of a flame or a plasma to provide a melt, wherein the particulate SiO2 has an average particle size in a range from 5 nm to 50 micrometers, and wherein at least 90 percent by weight particulate SiO2 source have a particle size in a range from 5 nm to 50 micrometers;
- and
- cooling the melt to provide a glass comprising at least 60 percent by weight Al2O3 and SiO2 in a range from 0.5 to 10 percent by weight, and not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass.
A method for making an article, the method comprising:
- feeding at least Al2O3 source and particulate SiO2 source into one of a flame or a plasma to provide a melt, wherein the particulate SiO2 has an average particle size in a range from 5 nm to 50 micrometers, and wherein at least 90 percent by weight particulate SiO2 source have a particle size in a range from 5 nm to 50 micrometers;
- cooling the melt to provide glass beads, wherein the glass comprises at least 60 percent by weight Al2O3 and SiO2 in a range from 0.5 to 10 percent by weight, and not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass, the glass having a Tg;
- heating the glass beads above the Tg such that the glass beads coalesce to form a shape;
- cooling the coalesced shape to provide a glass article.
1 more element
A method for making an article, the method comprising:
- feeding at least Al2O3 source and particulate SiO2 source into one of a flame or a plasma to provide a melt, wherein the particulate SiO2 has an average particle size in a range from 5 nm to 50 micrometers, and wherein at least 90 percent by weight particulate SiO2 source have a particle size in a range from 5 nm to 50 micrometers;
- cooling the melt to provide glass beads, wherein the glass comprises at least 60 percent by weight Al2O3 and SiO2 in a range from 0.5 to 10 percent by weight, and not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass, the glass having a Tg;
- crushing the glass beads to provide glass powder;
- heating the glass powder above the Tg such that the glass powder coalesces to form a shape;
- cooling the coalesced shape to provide a glass article.
2 more elements
A method for making an article, the method comprising:
- feeding at least Al2O3 source and particulate SiO2 source into one of a flame or a plasma to provide a melt, wherein the particulate SiO2 has an average particle size in a range from 5 nm to 50 micrometers, and wherein at least 90 percent by weight particulate SiO2 source have a particle size in a range from 5 nm to 50 micrometers;
- cooling the melt to provide glass beads, wherein the glass comprises at least 60 percent by weight Al2O3 and SiO2 in a range from 0.5 to 10 percent by weight, and not more than 10 percent by weight collectively As2O3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass, the glass having a Tg;
- crushing the beads to provide glass powder;
- heating the glass powder above the Tg such that the glass powder coalesces to form a shape;
- cooling the coalesced shape to provide a glass article.
2 more elements
Dependencies are inferred from the claim text.