Glass compositions and fibers made therefrom
Embodiments of the present invention relate to glass compositions, glass fibers formed from such compositions, and related products. In one embodiment, a glass composition comprises 58-62 weight percent SiO 2 , 14-17 weight percent Al 2 O 3 , 14-17.5 weight percent CaO, and 6-9 weight percent MgO, wherein the amount of Na 2 O is 0.09 weight percent or less.
1. A fiberizable glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
11-17 weight percent CaO;
6-9 weight percent MgO;
F 2 is present in an amount of greater than 0 weight percent to 0.5 weight percent;
at least one rare earth oxide or a mixture of rare earth oxides is present in a total amount of at least 0.1 weight percent to 3.0 weight percent; and
0-0.09 weight percent Na 2 O,
wherein the (Na 2 O+K 2 O+Li 2 O) content is less than 1 weight percent.
2. The glass composition of claim 1 , wherein the (MgO+CaO) content is greater than 21.5 weight percent.
3. The glass composition of claim 1 , wherein the glass composition is substantially free of B 2 O 3 .
4. The glass composition of claim 1 , wherein the glass composition is substantially free of Na 2 O.
5. The glass composition of claim 1 , wherein the composition is substantially free of Li 2 O.
6. The glass composition of claim 1 , wherein the glass composition is fiberizable, has a liquidus temperature of less than 1250° C., and has a forming temperature of less than 1300° C., wherein the difference between the forming temperature and the liquidus temperature is at least 50° C.
7. A glass fiber formed from the glass composition of claim 1 .
8. The glass fiber of claim 7 , wherein the glass fiber has a Young's modulus greater than 80 GPa.
9. The glass fiber of claim 7 , wherein the glass fiber has a Young's modulus greater than 85 GPa.
10. The glass fiber of claim 7 , wherein the glass fiber has a Young's modulus greater than 87 GPa.
11. A fiberizable glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
11-17 weight percent CaO;
6-9 weight percent MgO;
ZrO 2 is present in an amount of greater than 0 weight percent to 2 weight percent;
F 2 is present in an amount of greater than 0 weight percent to 0.5 weight percent;
at least one rare earth oxide or a mixture of rare earth oxides is present in a total amount of at least 0.1 weight percent to 3.0 weight percent; and
0-0.09 weight percent Na 2 O,
wherein the (Na 2 O+K 2 O+Li 2 O) content is less than 1 weight percent.
12. The glass composition of claim 11 , wherein the (MgO+CaO) content is greater than 21.5 weight percent.
13. The glass composition of claim 11 , wherein the composition comprises 60-62 weight percent SiO 2 .
14. The glass composition of claim 11 , wherein the glass composition is substantially free of Na 2 O.
15. The glass composition of claim 11 , wherein the glass composition is fiberizable, has a liquidus temperature of less than 1250° C., has a forming temperature of less than 1300° C., and wherein the difference between the forming temperature and the liquidus temperature is at least 50° C.
16. A glass fiber formed from the glass composition of claim 11 .
17. The glass fiber of claim 16 , wherein the glass fiber has a Young's modulus greater than 80 GPa.
18. A fiberizable glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
12.5-17.5 weight percent CaO;
6-8.5 weight percent MgO;
F 2 is present in an amount of greater than 0 weight percent to 0.5 weight percent;
at least one rare earth oxide or a mixture of rare earth oxides is present in a total amount of at least 0.1 weight percent to 3.0 weight percent; and
0-0.09 weight percent Na 2 O,
wherein the (Na 2 O+K 2 O+Li 2 O) content is less than 1 weight percent, and
wherein the CaO/MgO ratio is greater than 2.0.
19. A glass fiber formed from the glass composition of claim 18 .
20. The glass fiber of claim 19 , wherein the glass fiber has a Young's modulus greater than 80 GPa.