Glass compositions, fiberizable glass compositions, and glass fibers made therefrom
New glass compositions and applications thereof are disclosed. Embodiments of the present invention relate to glass compositions, to fiber glass strands, to chopped fiber glass strands, to nonwoven mats of glass fibers, and to other products and methods. A fiber glass strand comprises a plurality of glass fibers comprising the glass composition of the present invention.
1. A glass composition suitable for fiber forming comprising:
SiO 2 50-60 weight percent;
Al 2 O 3 24-35 weight percent;
MgO 2-12 weight percent;
CaO 0.5-7 weight percent;
Na 2 O 0-2 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 1-3 weight percent;
B 2 O 3 0-3 weight percent;
Fe 2 O 3 0-1 weight percent;
F 2 0-2 weight percent;
TiO 2 0-2 weight percent;
ZnO 0-3 weight percent;
BaO 0-6.5 weight percent; and
other constituents 0-8 weight percent total,
wherein the composition has a forming temperature (T F ) of at least 1250° C.
2. The composition of claim 1 , wherein the Al 2 O 3 +MgO content is at least 30 weight percent.
3. The composition of claim 1 , wherein the B 2 O 3 content is less than 2.1 weight percent.
4. The composition of claim 1 wherein the CaO content is less than 4 weight percent.
5. The composition of claim 1 , wherein the MgO+CaO content is less than 16 weight percent.
6. The composition of claim 1 wherein:
the Na 2 O content is 0-1 weight percent; and
the Li 2 O content is 1-3 weight percent.
7. The composition of claim 1 further comprising: at least one rare earth oxide in an amount greater than about 0.05 weight percent.
8. The composition of claim 7 wherein the one or more rare earth oxides are present in an amount up to about 8 weight percent.
9. The composition of claim 8 , wherein the one or more rare earth oxides comprise at least one of La 2 O 3 , CeO 2 , Y 2 O 3 and Sc 2 O 3 .
10. A glass composition suitable for fiber forming comprising:
SiO 2 47-64 weight percent;
Al 2 O 3 24-36 weight percent;
MgO 2-12 weight percent;
CaO 1-4 weight percent;
Na 2 O 0-2 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 1-3 weight percent;
B 2 O 3 0-3 weight percent;
Fe 2 O 3 0-1 weight percent;
F 2 0-2 weight percent;
TiO 2 0-2 weight percent;
ZnO 0-2 weight percent;
BaO 0-5 weight percent; and
other constituents 0-8 weight percent total.
11. The composition of claim 10 wherein the Na 2 O content is 0-1 weight percent and the Li 2 O content is 1 or more weight percent.
12. The composition of claim 10 wherein the composition is substantially free of BaO.
13. The composition of claim 10 , wherein:
the Al 2 O 3 content is 24-35 weight percent; and
the Al 2 O 3 +MgO content is at least 30 weight percent.
14. The composition of claim 13 wherein the B 2 O 3 content is less than 2.1 weight percent.
15. The composition of claim 13 wherein the MgO+CaO content is greater than 7 weight percent.
16. The composition of claim 10 , wherein the glass composition comprises one or more rare earth oxides in an amount greater than about 0.05 weight percent.
17. The composition of claim 16 , wherein the one or more rare earth oxides comprise at least one of La 2 O 3 , CeO 2 , Y 2 O 3 and Sc 2 O 3 .
18. A glass composition suitable for fiber forming comprising:
SiO 2 50-60 weight percent;
Al 2 O 3 24-35 weight percent;
MgO 2-12 weight percent;
CaO 0.5-7 weight percent;
Na 2 O 0-2 weight percent;
K 2 O 0-1 weight percent;
Li 2 O 1-3 weight percent;
B 2 O 3 0-3 weight percent;
Fe 2 O 3 0-1 weight percent;
F 2 0-2 weight percent;
TiO 2 0-2 weight percent;
ZnO 0-3 weight percent;
BaO 0-6.5 weight percent; and
other constituents 0-8 weight percent total.
19. The composition of claim 18 wherein the CaO content is less than 4 weight percent.
20. The composition of claim 18 , wherein the MgO+CaO content is less than 16 weight percent.
21. The composition of claim 18 further comprising: at least one rare earth oxide in an amount greater than about 0.05 weight percent.
22. The composition of claim 21 wherein the one or more rare earth oxides are present in an amount up to about 8 weight percent.