Glass compositions, fiberizable glass compositions, and glass fibers made therefrom
View Patent ↗The present invention relates generally to glass compositions incorporating rare earth oxides (RE 2 O 3 ). In one embodiment, a glass composition suitable for fiber forming comprises 51-70 wt. % SiO 2 , 12.5-22 wt. % Al 2 O 3 , 0-20 wt. % CaO, 0-11 wt. % MgO, 0.2-1 wt. % Fe 2 O 3 , 0.05 or greater wt. % RE 2 O 3 , and greater than 1 wt. % MnO x . In another embodiment, a glass composition suitable for fiber forming comprises 51-70 wt. % SiO 2 , 12.5-22 wt. % Al 2 O 3 , 0-20 wt. % CaO, 0-11 wt. % MgO, 0.2-1 wt. % Fe 2 O 3 , 0.05 or greater wt. % RE 2 O 3 , 0-4 wt. % BaO, 0-4 wt. % SrO, and 0-5.5 wt. % ZnO, wherein the sum of BaO+SrO+ZnO is greater than about 2 wt. %. In another embodiment, a glass composition suitable for fiber forming comprises 51-70 wt. % SiO 2 , 12.5-22 wt. % Al 2 O 3 , 0-20 wt. % CaO, 0-11 wt. % MgO, 0.2-1 wt. % Fe 2 O 3 , 0.05 or greater wt. % RE 2 O 3 , and from greater than 0 to 2.5 wt. % Cu 2 O. In another embodiment, a glass composition suitable for fiber forming comprises 51-70 wt. % SiO 2 , 12.5-22 wt. % Al 2 O 3 , 0-20 wt. % CaO, 0-12.5 wt. % MgO, 0.2-1 wt. % Fe 2 O 3 , 0.05 or greater wt. % RE 2 O 3 , and at least one additional feature selected from the group consisting of: La 2 O 3 is present in an amount greater than about 2 weight percent, CaO is present in an amount less than about 2 weight percent, a MgO/CaO ratio less than about 1, and a SiO 2 /Al 2 O 3 ratio greater than about 4. 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
from about 51 to about 70 weight percent;
Al 2 O 3
from about 12.5 to about 22 weight percent;
CaO
from 0 to about 20 weight percent;
MgO
from 0 to about 11 weight percent;
Fe 2 O 3
from about 0.2 to about 1 weight percent;
RE 2 O 3
about 0.05 or greater weight percent;
BaO
from 0 to about 4 weight percent;
SrO
from 0 to about 4 weight percent; and
ZnO
from 0 to about 5.5 weight percent;
wherein the sum of BaO+SrO+ZnO is greater than 2 weight percent.
2. The glass composition of claim 1 , wherein the sum of BaO+SrO+ZnO is greater than 3 weight percent.
3. The glass composition of claim 1 , wherein BaO is present in an amount greater than 2 weight percent.
4. The glass composition of claim 1 , wherein SrO is present in an amount greater than 2 weight percent.
5. The glass composition of claim 1 , wherein ZnO is present in an amount greater than 2 weight percent.
6. The glass composition of claim 1 , further comprising less than 1.5 weight percent Na 2 O+K 2 O+Li 2 O.
7. The glass composition of claim 1 , further comprising from 0 to about 1 weight percent B 2 O 3 .
8. A glass composition suitable for fiber forming comprising:
SiO 2
from about 51 to about 65 weight percent;
Al 2 O 3
from about 12.5 to about 22 weight percent;
CaO
from 0 to about 20 weight percent;
MgO
from 0 to about 12 weight percent;
Fe 2 O 3
from about 0.2 to about 1 weight percent;
RE 2 O 3
greater than 2 weight percent, wherein RE 2 O 3 comprises
La 2 O 3 in an amount greater than 2 weight percent; and at least
one additional feature selected from the group consisting of:
CaO is present in an amount less than 2 weight percent;
a ratio of MgO content to CaO content (MgO/CaO) less than 1; and
a ratio of SiO 2 content to Al 2 O 3 content (SiO 2 /Al 2 O 3 ) greater than 4.
9. The glass composition of claim 8 , wherein the composition comprises La 2 O 3 in an amount greater than 3 weight percent.
10. The glass composition of claim 8 , wherein MgO is present in an amount greater than 6 weight percent, and the additional feature comprises CaO in an amount less than 1.5 weight percent.
11. The glass composition of claim 8 , wherein the additional feature comprises the SiO 2 /Al 2 O 3 ratio in an amount greater than 4.2.
12. The glass composition of claim 8 , further comprising less than 1.5 weight percent Na 2 O+K 2 O+Li 2 O.