Glass compositions, fiberizable glass compositions, and glass fibers made therefrom
Embodiments of the present invention provide glass compositions, fiberizable glass compositions, and glass fibers formed from such compositions, as well as glass strands, yarns, fabrics, and composites comprising such glass fibers adapted for use in various applications. In some embodiments of the present invention, the glass compositions additionally include at least one rare earth oxide.
1. A glass composition suitable for fiber forming comprising:
SiO 2
56-68
weight percent;
Al 2 O 3
11-less than 18
weight percent;
CaO
12
weight percent or less;
MgO
7-17
weight percent;
Na 2 O
0-1
weight percent;
K 2 O
0-1
weight percent;
Li 2 O
0-5
weight percent;
TiO 2
0-2
weight percent;
Fe 2 O 3
0-1
weight percent;
SnO 2
0-4
weight percent;
ZnO
0-4
weight percent;
at least one rare earth oxide in an amount greater than 1 weight percent; and
other constituents 0-11 weight percent total,
wherein the (Na 2 O+K 2 O+Li 2 O) content is greater than 1 weight percent, and
wherein the composition is substantially free of B 2 O 3 .
2. The glass composition of claim 1 , wherein the SiO 2 content is at least 60 weight percent.
3. The glass composition of claim 1 , wherein the Al 2 O 3 content is 14-19 weight percent.
4. The glass composition of claim 1 , wherein MgO is 10-17 weight percent.
5. The glass composition of claim 1 , wherein the CaO content is less than 5 weight percent.
6. The glass composition of claim 1 , wherein ZnO is present in an amount of >0 weight percent.
7. The glass composition of claim 1 , wherein the Li 2 O content is 0.4-2 weight percent.
8. The glass composition of claim 1 , wherein the Na 2 O+K 2 O content is less than 0.5 weight percent.
9. The glass composition of claim 1 , wherein the Na 2 O+K 2 O+Li 2 O content is up to 2.5 weight percent.
10. The glass composition of claim 9 , wherein the Na 2 O+K 2 O content is less than 0.5 weight percent.
11. The glass composition of claim 1 , further comprising Nb 2 O 5 in an amount of >0-5 weight percent.
12. The glass composition of claim 1 , wherein SnO 2 is present in an amount of >0 weight percent.
13. The glass composition of claim 1 , wherein CeO 2 is present in an amount of >0-4 weight percent.
14. The glass composition of claim 1 , wherein SnO 2 +CeO 2 is >1-8 weight percent.
15. 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.
16. The glass composition of claim 1 , wherein the at least one rare earth oxide is present in an amount up to 8 weight percent.
17. The glass composition of claim 1 , wherein the at least one rare earth oxide is present in an amount up to 5 weight percent.
18. 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 , Nd 2 O 3 , CeO 2 , Sm 2 O 3 , and Gd 2 O 3 .
19. A glass fiber comprising:
SiO 2
60-68
weight percent;
Al 2 O 3
14-less than 18
weight percent;
CaO
12
weight percent or less;
MgO
7-17
weight percent;
Na 2 O
0-1
weight percent;
K 2 O
>0-1
weight percent;
Li 2 O
0-5
weight percent;
TiO 2
>0.3-2
weight percent;
Fe 2 O 3
0-1
weight percent;
SnO 2
0-4
weight percent;
ZnO
0-4
weight percent;
at least one rare earth oxide in an amount not less than 0.05 weight percent; and
other constituents 0-11 weight percent total, and
wherein the composition is substantially free of B 2 O 3 .