Glass compositions, fiberizable glass compositions, and glass fibers made therefrom
The present invention relates generally to glass compositions incorporating rare earth oxides. In one embodiment, a glass composition suitable for fiber forming comprises 51-65 weight percent SiO 2 , 12.5-19 weight percent Al 2 O 3 , 0-16 weight percent CaO, 0-12 weight percent MgO, 0-2.5 weight percent Na 2 O, 0-1 weight percent K 2 O, 0-2 weight percent Li 2 O, 0-3 weight percent TiO 2 , 0-3 weight percent ZrO 2 , 0-3 weight percent B 2 O 3 , 0-3 weight percent P 2 O 5 , 0-1 weight percent Fe 2 O 3 , at least one rare earth oxide in an amount not less than 0.05 weight percent, and 0-11 weight percent total other constituents. In some embodiments, the at least one rare earth oxide comprises at least one of La 2 O 3 , Y 2 O 3 , Sc 2 O 3 , and Nd 2 O 3 . The at least one rare earth oxide is present in an amount of at least 1 weight percent in some embodiments. The at least one rare earth oxide, in some embodiments, is present in an amount of at least 3 weight percent. The glass compositions can be used to form glass fibers which can be incorporated into a variety of other fiber glass products (e.g., strands, rovings, fabrics, etc.) and incorporated into various composites.
1. A glass composition suitable for fiber forming comprising:
SiO 2 54-64 weight percent;
Al 2 O 3 14-19 weight percent;
CaO 0.5-14.0 weight percent;
MgO 6-9 weight percent;
Na 2 O 0-1.5 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 0-1 weight percent;
TiO 2 0-3 weight percent;
B 2 O 3 0-1 weight percent;
Fe 2 O 3 0-0.5 weight percent;
at least one rare earth oxide in an amount greater than 1 weight percent; and Na 2 O+K 2 O+Li 2 O is greater than 0 weight percent.
2. The glass composition of claim 1 , wherein the Na 2 O+K 2 O+Li 2 O content is greater than −0.5 weight percent.
3. The glass composition of claim 1 , wherein the SiO 2 content is between about 59 and 64 weight percent.
4. The glass composition of claim 1 , wherein the at least one rare earth oxide is present in an amount of at least 2 weight percent.
5. The glass composition of claim 1 , wherein the at least one rare earth oxide is present in an amount of at least 3 weight percent.
6. The glass composition of claim 5 , wherein the at least one rare earth oxide is present in an amount up to about 10 weight percent.
7. The glass composition of claim 1 , wherein the at least one rare earth oxide comprises at least one of La 2 O 3 , Y 2 O 3 , Sc 2 O 3 , and Nd 2 O 3 .
8. The glass composition of claim 1 , wherein the at least one rare earth oxide comprises La 2 O 3 and Y 2 O 3 .
9. The glass composition of claim 1 , further comprising ZrO 2 in an amount up to about 2 weight percent.
10. A glass composition suitable for fiber forming comprising:
SiO 2 51-65 weight percent;
Al 2 O 3 12.5-22 weight percent;
CaO 0-16 weight percent;
MgO 0-12 weight percent;
Na 2 O 0-2.5 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 0-2 weight percent;
TiO 2 0-3 weight percent;
B 2 O 3 0-3 weight percent;
P 2 O 5 0-3 weight percent;
Fe 2 O 3 0-1 weight percent; and
at least one rare earth oxide in an amount not less than 0.05 weight percent,
wherein the Na 2 O+K 2 O+Li 2 O content is greater than 1 weight percent.
11. The glass composition of claim 10 , wherein MgO is present in amount up to about 9 weight percent.
12. The glass composition of claim 10 , wherein the MgO content is between about 6 and about 9 weight percent.
13. The glass composition of claim 10 , wherein the SiO 2 content is at least 60 weight percent.
14. The glass composition of claim 10 , wherein the at least one rare earth oxide is present in an amount of at least 1 weight percent.
15. The glass composition of claim 10 , wherein the at least one rare earth oxide is present in an amount of at least 3 weight percent.
16. The glass composition of claim 10 , wherein the at least one rare earth oxide is present in an amount up to about 15 weight percent.
17. The glass composition of claim 10 , wherein the at least one rare earth oxide comprises at least one of La 2 O 3 , Y 2 O 3 , Sc 2 O 3 , and Nd 2 O 3 .
18. The glass composition of claim 17 , wherein the at least one rare earth oxide comprises La 2 O 3 and Y 2 O 3 .
19. The glass composition of claim 10 , further comprising ZrO 2 in an amount up to about 3.0 weight percent.
20. A glass composition suitable for fiber forming comprising:
SiO 2 51-63 weight percent;
Al 2 O 3 14.5-19 weight percent;
CaO 0.5-10 weight percent;
MgO 0-12 weight percent;
Na 2 O 0-1 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 0-2 weight percent;
TiO 2 0-3 weight percent;
B 2 O 3 0-2 weight percent;
P 2 O 5 0-3 weight percent;
Fe 2 O 3 0-1 weight percent;
at least one rare earth oxide in an amount not less than 0.5 weight percent,
wherein the Na 7 O+K 7 O+Li 2 O content is greater than 1 weight percent.
21. The glass composition of claim 20 , wherein MgO is present in amount up to about 9 weight percent.
22. The glass composition of claim 20 , wherein the MgO content is between about 6 and about 9 weight percent.
23. The glass composition of claim 20 , wherein the SiO 2 content is at least 60 weight percent.
24. The glass composition of claim 20 , wherein the at least one rare earth oxide is present in an amount of at least 1 weight percent.
25. The glass composition of claim 20 , wherein the at least one rare earth oxide is present in an amount of at least 3 weight percent.
26. The glass composition of claim 25 , wherein the at least one rare earth oxide is present in an amount up to about 15 weight percent.
27. The glass composition of claim 20 , wherein the at least one rare earth oxide comprises at least one of La 2 O 3 , Y 2 O 3 , Sc 2 O 3 , and Nd 2 O 3 .
28. The glass composition of claim 27 , wherein the at least one rare earth oxide comprises La 2 O 3 and Y 2 O 3 .
29. The glass composition of claim 20 , further comprising ZrO 2 in an amount up to about 3.0 weight percent.