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 glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
11-17.5 weight percent CaO;
6-9 weight percent MgO;
less than 1 weight percent K 2 O;
0-1 weight percent TiO 2 ;
F 2 is present in an amount up to 0.5 weight percent; and
at least one rare earth oxide in an amount between 0.1 and 3.0 weight percent;
wherein the amount of Na 2 O is 0.09 weight percent or less, wherein the glass composition is substantially free of Li 2 O, and 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 glass composition is substantially free of B 2 O 3 .
3. The glass composition of claim 1 , wherein the glass composition is substantially free of Na 2 O.
4. The glass composition of claim 1 , wherein the (MgO+CaO) content is greater than 21.5 weight percent.
5. The glass composition of claim 1 , wherein the CaO content is 14-17.5 weight percent.
6. The glass composition of claim 1 , further comprising at least one of As 2 O 3 , MnO, MnO 2 , Sb 2 O 3 , and SnO 2 in an amount greater than 0 weight percent.
7. The glass composition of claim 1 , further comprising MnO or MnO 2 in an amount from greater than 0 weight percent to 0.5 weight percent.
8. 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.
9. The glass composition of claim 1 , wherein the glass composition is formed at a forming temperature less than 1280° C.
10. A glass fiber formed from the glass composition of claim 1 .
11. The glass fiber of claim 10 , wherein the glass fiber has a Young's modulus greater than 80 GPa.
12. The glass fiber of claim 10 , wherein the glass fiber has a Young's modulus greater than 85 GPa.
13. The glass fiber of claim 10 , wherein the glass fiber has a Young's modulus greater than 87 GPa.
14. A glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
11-17.5 weight percent CaO;
6-9 weight percent MgO;
less than 1 weight percent K 2 O;
less than 1 weight percent Li 2 O;
0-1 weight percent TiO 2 ;
ZrO 2 is present in an amount up to 2 weight percent;
F 2 is present in an amount up to 0.5 weight percent, and
at least one rare earth oxide in an amount between 0.1 and 3.0 weight percent;
wherein the amount of Na 2 O is 0.09 weight percent or less, and wherein the (Na 2 O+K 2 O+Li 2 O) content is less than 1 weight percent.
15. The glass composition of claim 14 , wherein the glass composition is substantially free of Na 2 O.
16. The glass composition of claim 14 , wherein the (MgO+CaO) content is greater than 21.5 weight percent.
17. The glass composition of claim 14 , wherein the CaO content is 14-17.5 weight percent.
18. The glass composition of claim 14 , wherein the SiO 2 content is 60-62 weight percent.
19. The glass composition of claim 14 , wherein the glass composition is substantially free of B 2 O 3 .
20. The glass composition of claim 14 , 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.
21. A glass fiber formed from the glass composition of claim 14 .
22. The glass fiber of claim 21 , wherein the glass fiber has a Young's modulus greater than 80 GPa.
23. A glass composition comprising:
58-62 weight percent SiO 2 ;
14-17 weight percent Al 2 O 3 ;
11-17.5 weight percent CaO;
6-9 weight percent MgO;
less than 1 weight percent K 2 O;
less than 1 weight percent Li 2 O;
0-1 weight percent TiO 2 ;
F 2 is present in an amount up to 0.5 weight percent; and
at least one rare earth oxide in an amount between 0.1 and 3.0 weight percent,
wherein the amount of Na 2 O is 0.09 weight percent or less, wherein the (Na 2 O+K 2 O+Li 2 O) content is less than 1 weight percent, and wherein the (MgO+CaO) content is greater than 21.5 weight percent.
24. The glass composition of claim 23 , wherein the CaO content is 14-17.5 weight percent.
25. The glass composition of claim 23 , wherein the SiO 2 content is 60-62 weight percent.
26. The glass composition of claim 23 , wherein the glass composition is substantially free of B 2 O 3 .
27. A glass fiber formed from the glass composition of claim 23 .
28. The glass fiber of claim 27 , wherein the glass fiber has a Young's modulus greater than 80 GPa.