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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0666615 (2003-09-18) |
등록번호 | US-7297171 (2007-11-20) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 3 인용 특허 : 198 |
Methods for making glass-ceramics comprising Al2O3, REO, at least one of ZrO2 or HfO2 and at least one of Nb2O5 or Ta2O5. Glass-ceramics 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 embo
Methods for making glass-ceramics comprising Al2O3, REO, at least one of ZrO2 or HfO2 and at least one of Nb2O5 or Ta2O5. Glass-ceramics 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 according to the present invention can be are particularly useful as abrasive particles.
What is claimed is: 1. A method for making a glass-ceramic, the method comprising heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, Z
What is claimed is: 1. A method for making a glass-ceramic, the method comprising heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, ZrO2, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5. 2. A method for making a glass-ceramic, the method comprising heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 40 percent by weight Al2O3, based on the total weight of the glass, REO, at least 20 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the sample glass free of Nb2O5 and Ta2O. 3. A method for making a glass-ceramic, the method comprising heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, at least 30 percent by weight REO, and at least 10 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5. 4. A method for making abrasive particles, the method comprising heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the glass comprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, ZrO2, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5. 5. A method for making abrasive particles, the method comprising heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, REO, at least 20 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5. 6. A method for making abrasive particles, the method comprising heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the glass comprising at least 50 percent by weight Al2O3, at least 30 percent by weight REO, at least 10 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5. 7. The method according to claim 1, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 8. The method according to claim 1, wherein the at least of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 as compared to the comparative glass-ceramic. 9. The method according to claim 1, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 10. The method according to claim 1, wherein the REO is at least one of Gd2O3, La2O3, or Nd2O3. 11. A method of making abrasive particles, the method comprising: heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, ZrO2, and at least one of Nb2O5 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; and crushing the glass-ceramic to provide the abrasive particles. 12. The method according to claim 11, further comprises grading the abrasive particles to provide a plurality of particles having a specified nominal grade. 13. A method of making an abrasive article, the method comprising: heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, ZrO2, and at least one of Nb2O5 or Ta2O5 wherein the glass contains not more than 10 percent by weight collectively As2O3, B2O3, GeO7, P2O5, SiO2, TeO2, and V2O5 based on the total weight of the glass, and wherein the at least one of Nb2O5 or Ta2O5, is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic madc by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; crushing the glass-ceramic to provide abrasive particles; and incorporating the abrasive particles into an abrasive article. 14. The method according to claim 1, wherein the glass-ceramic has an average hardness of at least 15 GPa. 15. The method according to claim 1, wherein the glass-ceramic has an average hardness of at least 17 GPa. 16. The method according to claim 1, wherein the glass-ceramic has an average hardness of at least 18 GPa. 17. The method according to claim 1, wherein the glass-ceramic has an average hardness of at least 19 GPa. 18. The method according to claim 2, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 19. The method according to claim 2, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 is compared to the comparative glass-ceramic. 20. The method according to claim 2, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 21. A method of abrasive particles, the method comprising: heat-treating, glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 40 percent by weight Al2O3 based on the total weight of the glass, REO, at least 20 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner. the same glass free of Nb2O5 and Ta2O5; and crushing the glass-ceramic to provide the abrasive particles. 22. The method according to claim 21, further comprises grading the abrasive particles to provide a plurality of particles having a specified nominal grade. 23. A method of making an abrasive article, the method comprising: heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 40 percent by weight Al2O3, based on the total weight of the glass, REO, at least 20 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, wherein the class 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, and wherein the at least one of Nb2O5or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2, formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; crushing the glass-ceramic to provide the abrasive particles; and incorporating the abrasive particles into an abrasive article. 24. The method according to claim 2, wherein the glass-ceramic has an average hardness of at least 15 GPa. 25. The method according to claim 2, wherein the glass-ceramic has an average hardness of at least 18 GPa. 26. The method according to claim 2, wherein the glass-ceramic has an average hardness of at least 19 GPa. 27. The method according to claim 3, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 28. The method according to claim 3, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 as compared to the comparative glass-ceramic. 29. The method according to claim 3, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 30. The method according to claim 3, wherein the REO is at least one of Gd2O3, La2O3, or Nd2O3. 31. A method of making abrasive particles, the method comprising: heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide glass-ceramic, the glass comprising at least 50 percent by weight Al2O3, at least 30 percent by weight REO, and at least 10 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; and crushing the glass-ceramic to provide the abrasive particles. 32. The method according to claim 31, further comprises grading the abrasive particles to provide a plurality of particles having a specified nominal grade. 33. A method of making an abrasive article, the method of comprising: heat-treating glass to convert at least a portion of the glass to crystalline ceramic and provide lass-ceramic, the glass comprising at least 50 percent bv weight Al2O3, at least 30 percent by weight REO, and at least 10 percent by weight ZrO2 based on the total weight of the glass, and at least one of Nb2O5or Ta2O5, 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, and wherein the at least one of Nb2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treatin, in the same manner, the same glass free of Nb2O5 and Ta2O5; and crushing the glass-ceramic to provide abrasive particles; and incorporating the abrasive particles into an abrasive article. 34. The method according to claim 3, wherein the glass-ceramic has an average hardness of at least 15 GPa. 35. The method according to claim 3, wherein the glass-ceramic has an average hardness of at least 18 GPa. 36. The method according to claim 3, wherein the glass-ceramic has an average hardness of at least 19 GPa. 37. The method according to claim 4, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 38. The method according to claim 4, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 as compared to the comparative glass-ceramic. 39. The method according to claim 4, wherein the at least one of Nb2O5 or Ta2O5 is present in an arnount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 40. The method according to clain 4, wherein the REO is at least one of Gd2O3, La2O3, or Nd2O3. 41. The method according to claim 4, further comprises grading the glass-ceramic abrasive particles to provide a plurality of particles having a specified nominal grade. 42. A method of making an abrasive article, the method comprising: heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the class comnprising at least 50 percent by weight Al2O3, based on the total weight of the glass, REO, ZrO2, and at least one of Nb2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; and incorporating the glass-ceramic abrasive particles into an abrasive article. 43. The method according to claim 4, wherein the glass-ceramic abrasive particles have an average hardness of at least 17 GPa. 44. The method according to claim 4, wherein the glass-ceramic abrasive particles have an average hardness of at least 18 GPa. 45. The method according to claim 4, wherein the glass-ceramic abrasive particles have an average hardness of at least 19 GPa. 46. The method according to claim 5, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 47. The method according to claim 5, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 as compared to the comparative glass-ceramic. 48. The method according to claim 5, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 49. The method according to claim 5, wherein the REO is at least one of Gd2O3, La2O3, Nd2O3. 50. The method according to claim 49, further comprises grading the glass-ceramic abrasive particles to provide a plurality of particles having a specified nominal grade. 51. A method of making an abrasive article, the method comprising: heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the glass comprising at least 35 percent by weight Al2O3, based on the total weight of the glass, REO, at least 20 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, 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, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5, and Ta2O5; and incorporating the glass-ceramic abrasive particles into an abrasive article. 52. The method according to claim 5, wherein the glass-ceramic abrasive particles have an average hardness of at least 18 GPa. 53. The method according to claim 5, wherein the glass-ceramic abrasive particles have an average hardness of at least 19 GPa. 54. The method according to claim 6, wherein the at least one of Nb2O5 or Ta2O5 is prescnt in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 1.5 as compared to the comparative glass-ceramic. 55. The method according to claim 6, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 2 as compared to the comparative glass-ceramic. 56. The method according to claim 6, wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass by at least a factor of 3 as compared to the comparative glass-ceramic. 57. The method according to claim 6, wherein the REO is at least one of Gd2O3, La2O3, or Nd2O3. 58. The method according to claim 6, further comprises grading the glass-ceramic abrasive particles to provide a plurality of particles having a specified nominal grade. 59. A method of making an abrasive article, the method comprising: heat-treating glass particles to convert at least a portion of the glass to crystalline ceramic to provide glass-ceramic abrasive particles, the glass comprising at least 50 percent by weight Al2O3, at least 30 percent by weight REO, at least 10 percent by weight ZrO2, based on the total weight of the glass, and at least one of Nb2O5 or Ta2O5, wherein the glass contains not more than 10 percent by weight collectively As2O3, GeO2, P2O5, SiO2, TeO2, and V2O5, based on the total weight of the glass, and wherein the at least one of Nb2O5 or Ta2O5 is present in an amount sufficient to increase the rate of crystalline ZrO2 formation from the glass as compared to a comparative glass-ceramic made by heat-treating, in the same manner, the same glass free of Nb2O5 and Ta2O5; and incorporating the glass-ceramic abrasive particles into an abrasive article. 60. The method according to claim 6, wherein the glass-ceramic abrasive particles have an average hardness of at least 18 GPa. 61. The method according to claim 6, wherein the glass-ceramic abrasive particles have an average hardness of at least 19 GPa.
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