High performance fiberglass composition with improved elastic modulus
A glass composition is provided that includes SiO 2 in an amount from 50.0 to 65.0% by weight; Al 2 O 3 in an amount from 18.0 to 23.0% by weight; CaO in an amount from 1 to 8.5% by weight; MgO in an amount from 9.0 to 14.0% by weight; Na 2 O in an amount from 0.0 to 1.0% by weight; K 2 O in an amount from 0.0 to 1.0% by weight; Li2O in an amount from 0.1 to 4.0% by weight; TiO 2 in an amount from 0.0 to 2.5% by weight, Y 2 O 3 in an amount from 0 to 10.0% by weight; La 2 O 3 in an amount from 0 to 10.0% by weight; Ce 2 O 3 in an amount from 0 to 5.0% by weight; and Sc 2 O 3 in an amount from 0 to 5.0% by weight. Glass fibers formed from the inventive composition may be used in applications that require high stiffness and have elastic modulus between 88 and 115 GPa. Such applications include woven fabrics for use in forming wind turbine blades and aerospace structures.
1. A glass composition comprising:
SiO 2 in an amount from 50.0 to 55.6% by weight;
Al 2 O 3 in an amount from 19.5 to 23.0% by weight;
CaO in an amount from 1.0 to 5.0% by weight;
MgO in an amount from 10.0 to 14.0% by weight;
Na 2 O in an amount from 0.0 to 1.0% by weight;
K 2 O in an amount from 0.0 to less than 1.0% by weight;
Li 2 O in an amount from 1.0 to 4.0% by weight;
TiO 2 in an amount from 0.0 to 2.5% by weight,
Y 2 O 3 in an amount from 0 to 10.0% by weight;
La 2 O 3 in an amount from 0 to 10.0% by weight;
Ce 2 O 3 in an amount from 0 to 5.0% by weight;
Sc 2 O 3 in an amount from 0 to 5.0% by weight; and
a total concentration of La 2 O 3 +Y 2 O 3 in an amount from 2.0 to 10.0% by weight, wherein a glass fiber formed from said glass composition has an elastic modulus between 88 and 115 GPa, a tensile strength according to ASTM D2343-09 of at least 4,400 MPa, and a fiberizing temperature of 2,277° F. or less.
2. The glass composition of claim 1 , further including:
0 to about 7.0% by weight Ta 2 O 5 ;
0 to about 7.0% by weight Ga 2 O 3 ;
0 to about 2.5% by weight Nb 2 O 5 , and
0 to about 2.0% by weight V 2 O 5 .
3. The glass composition according to claim 1 , wherein said composition includes 0.1 to 5.5% by weight Ta 2 O 3 .
4. The glass composition according to claim 1 , wherein said composition includes 6.0 to 10 wt. % Y 2 O 3 .
5. The glass composition according to claim 1 , wherein said composition includes greater than 1.5 to 10 wt. % La 2 O 3 .
6. The glass composition according to claim 1 , wherein said composition comprises a ratio of MgO/(CaO+SrO) of greater than 2.1.
7. The glass composition according to claim 1 , wherein said composition is essentially free of B 2 O 3 .
8. The glass composition according to claim 1 , wherein said composition comprises 0.1 to 3.5% by weight Li 2 O.
9. The glass composition according to claim 1 , wherein the composition includes at least 4% by weight of Y 2 O 3 , La 2 O 3 , Ce 2 O 3 , and Sc 2 O 3 .
10. A glass fiber formed from a composition comprising:
SiO 2 in an amount from 50.0 to 55.6% by weight;
Al 2 O 3 in an amount from 19.5 to 23.0% by weight;
CaO in an amount from 1 to 8.5% by weight;
MgO in an amount from 10.0 to 14.0% by weight;
Na 2 O in an amount from 0.0 to 1.0% by weight;
K 2 O in an amount from 0.0 to less than 1.0% by weight;
Li 2 O in an amount from 0.0 to 4.0% by weight;
TiO 2 in an amount from 0.0 to 2.5% by weight,
Y 2 O 3 in an amount from 6.0 to 10.0% by weight;
La 2 O 3 in an amount from 0 to 10.0% by weight;
Ce 2 O 3 in an amount from 0 to 5.0% by weight; and
Sc 2 O 3 in an amount from 0 to 5.0% by weight, wherein said glass fiber has an elastic modulus between 88 and 115 GPa and a fiberizing temperature of 2,277° F. or less.
11. The glass fiber according to claim 10 , wherein the glass composition comprises 18.3 to 21.5% by weight Al 2 O 3 .
12. The glass fiber according to claim 10 , wherein the glass composition includes greater than 1.5 to 10 wt. % La 2 O 3 .
13. The glass fiber according to claim 10 , wherein the glass composition comprises a ratio of MgO/(CaO+SrO) of greater than 2.1.
14. The glass fiber according to claim 10 , wherein said composition is essentially free of B 2 O 3 .
15. The glass fiber according to claim 10 , wherein said composition comprises 1.5 to 3.5% by weight Li 2 O.
16. The glass fiber according to claim 10 , wherein said glass fiber has an elastic modulus of 89 to 100 GPa.
17. A method of forming a continuous glass fiber comprising:
providing a molten composition according to claim 1 ; and
drawing said molten composition through an orifice to form a continuous glass fiber.
18. A reinforced composite product comprising:
a polymer matrix; and
a plurality of glass fibers formed from a glass composition comprising:
SiO 2 in an amount from 50.0 to 55.6% by weight;
Al 2 O 3 in an amount from 19.5 to 23.0% by weight;
CaO in an amount from 1.0 to 5.0% by weight;
MgO in an amount from 10.0 to 14.0% by weight;
Na 2 O in an amount from 0.0 to 1.0% by weight;
K 2 O in an amount from 0.0 to less than 1.0% by weight;
Li 2 O in an amount from 1.0 to 4.0% by weight;
TiO 2 in an amount from 0.0 to 2.5% by weight,
Y 2 O 3 in an amount from 0 to 10.0% by weight;
La 2 O 3 in an amount from 0 to 10.0% by weight;
Ce 2 O 3 in an amount from 0 to 5.0% by weight;
Sc 2 O 3 in an amount from 0 to 5.0% by weight; and
a total concentration of La 2 O 3 +Y 2 O 3 in an amount from 2.0 to 10.0% by weight, wherein the glass fibers have an elastic modulus between 88 and 115 GPa, a tensile strength according to ASTM D2343-09 of at least 4,400 MPa, and a fiberizing temperature of 2,277° F. or less.
19. A reinforced composite product according to claim 18 , wherein said reinforced composite product is in the form of a wind turbine blade.