Glass-ceramics and methods of making the same. Embodiments of the invention include abrasive particles. The abrasive particles can be incorporated into a variety of abrasive articles, including bonded abrasives, coated abrasives, nonwoven abrasives, and abrasive brushes.
대표청구항▼
What is claimed is: 1. Glass-ceramic having an average hardness of at least 13 GPa, wherein the glass-ceramic has x, y, and z dimensions each perpendicular to each other, and wherein each of the x, y, and z dimensions is at least 5 mm. 2. The glass-ceramic according to claim 1 wherein the hardnes
What is claimed is: 1. Glass-ceramic having an average hardness of at least 13 GPa, wherein the glass-ceramic has x, y, and z dimensions each perpendicular to each other, and wherein each of the x, y, and z dimensions is at least 5 mm. 2. The glass-ceramic according to claim 1 wherein the hardness is at least 15 GPa. 3. The glass-ceramic according to claim 1 wherein the hardness is at least 16 GPa. 4. The glass-ceramic according to claim 3 wherein the hardness is at least 17 GPa. 5. The glass-ceramic according to claim 4 wherein the hardness is at least 18 GPa. 6. The glass-ceramic according to claim 1 comprising at least 35 percent by weight Al2O3, based on the total weight of the glass-ceramic. 7. The glass-ceramic according to claim 1 wherein the glass-ceramic contains not more than 10 percent by weight collectively As 2O3, B2O3, GeO2, P2O 5, SiO2, TeO2, and V2O5, based on the total weight of the glass. 8. Beads comprising the glass-ceramic according to claim 1. 9. A plurality of abrasive particles having a specified nominal grade, wherein at least a portion of the plurality of abrasive particles comprise a glass-ceramic having an average hardness of at least 15 GPa. 10. The plurality of abrasive particles according to claim 9 wherein the hardness is at least 16 GPa. 11. The plurality of abrasive particles according to claim 10 wherein the hardness is at least 18 GPa. 12. The plurality of abrasive particles according to claim 9 wherein the specified nominal grade is selected from the group consisting of ANSI 4, ANSI 6, ANSI 8, ANSI 16, ANSI 24, ANSI 36, ANSI 40, ANSI 50, ANSI 60, ANSI 80, ANSI 100, ANSI 120, ANSI 150, ANSI 180, ANSI 220, ANSI 240, ANSI 280, ANSI 320, ANSI 360, ANSI 400, and ANSI 600. 13. The plurality of abrasive particles according to claim 9 wherein the specified nominal grade is selected from the group consisting of P8, P12, P16, P24, P36, P40, P50, P60, P80, P100, P120, P150, P180, P220, P320, P400, P500, P600, P800, P1000, and P1200. 14. The plurality of abrasive particles according to claim 9 wherein the specified nominal grade is selected from the group consisting of JIS8, JIS12, JIS16, JIS24, JIS36, JIS46, JIS54, JIS60, JIS80, JIS100, JIS150, JIS180, JIS220, JIS240, JIS280, JIS320, JIS360, JIS400, JIS600, JIS800, JIS1000, JIS1500, JIS2500, JIS4000, JIS6000, JIS8000, and JIS10, 000. 15. An abrasive article comprising a binder and a plurality of abrasive particles, wherein at least a portion of the abrasive particles comprise a glass-ceramic having an average hardness of at least 15 GPa. 16. The abrasive article according to claim 15 wherein the abrasive article is a bonded abrasive article, a non-woven abrasive article, or a coated abrasive article. 17. A method of abrading a surface, the method comprising: providing an abrasive article comprising a binder and a plurality of abrasive particles, wherein at least a portion of the abrasive particles comprise a glass-ceramic having an average hardness of at least 15 GPa; contacting at least one of the abrasive particles comprise glass-ceramic with a surface of a workpiece; and moving at least one of the contacted abrasive particles comprising glass-ceramic or the contacted surface to abrade at least a portion of the surface with the contacted abrasive particle comprising glass-ceramic. 18. A method for making glass-ceramic, the method comprising: heat-treating amorphous material such that at least a portion of the amorphous material converts to a glass-ceramic, the amorphous material comprising at least 35 percent by weight Al2O3, based on the total weight of the amorphous material, and a metal oxide other than Al2O3, wherein the amorphous material contains not more than 10 percent by weight collectively As2O 3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the amorphous material, wherein the glass-ceramic has an average hardness of at least 13 GPa, wherein the glass-ceramic has x, y, and z dimensions each perpendicular to each other, and wherein each of the x, y, and z dimensions is at least 5 mm. 19. A method for making a glass-ceramic article, the method comprising: providing glass particles, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass of each particle, and a metal oxide other than Al2O 3, wherein the glass contains not more than 10 percent by weight collectively As2O3, B2O3, GeO 2, P2O5, SiO2, TeO2, and V 2O5, based on the total weight of the glass of each particle, the glass having a Tg; heating the glass particles above the Tg such that the glass particles coalesce to form a shape; cooling the shape to provide a glass article, and heat-treating the glass article such that at least a portion of the glass converts to glass-ceramic to provide a glass-ceramic article, wherein the glass-ceramic has an average hardness of at least 13 GPa. 20. A method for making abrasive particles, the method comprising: heat-treating particles comprising amorphous material such that at least a portion of the amorphous material is converted to a glass-ceramic and provides abrasive particles comprising the glass-ceramic, the amorphous material of each particle comprising at least 35 percent by weight Al2O3, based on the total weight of the amorphous material of each particle, and a metal oxide other than Al 2O3, wherein the amorphous material of each particle contains not more than 10 percent by weight collectively As2O 3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the amorphous material of each particle, wherein the glass-ceramic has an average hardness of at least 15 GPa. 21. The method according to claim 20 wherein prior to the heat-treating the particles comprising the amorphous material, a plurality of particles having a specified nominal grade is provided, wherein at least a portion of the particles is a plurality of the glass particles, and wherein the heat-treating is conducted such that a plurality of abrasive particles having a specified nominal grade is provided, wherein at least a portion of the abrasive particles is a plurality of the abrasive particles comprising the glass-ceramic. 22. The method according to claim 20 further comprising grading the abrasive particles comprising the glass-ceramic to provide a plurality of abrasive particles having a specified nominal grade, wherein at least a portion of the plurality of abrasive particles is a plurality of the abrasive particles comprising the glass-ceramic. 23. A method for making abrasive particles, the method comprising: heat-treating amorphous material such that at least a portion of the amorphous material is converted to a glass-ceramic, the amorphous material comprising at least 35 percent by weight Al2O3, based on the total weight of the amorphous material, and a metal oxide other than Al2O3, wherein the amorphous material contains not more than 10 percent by weight collectively As2O 3, B2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the amorphous material, wherein the glass-ceramic has an average hardness of at least 15 GPa; and crushing the glass-ceramic to provide abrasive particles comprising the glass-ceramic. 24. A method for making glass-ceramic, the method comprising: combining at least (a) glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, and at least one other metal oxide, wherein the glass contains not more than 10 percent by weight collectively As2O3, B 2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass, the glass having a Tg and (b) refractory particles relative to the glass particles; heating the glass particles above the Tg such that the glass particles coalesce; cooling the glass to provide ceramic; and heat-treating the glass of the ceramic such that at least a portion of the glass converts to glass-ceramic to provide the glass-ceramic, wherein the glass-ceramic has an average hardness of at least 13 GPa. 25. The glass-ceramic according to claim 1 in the form of an IR window.
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