Fiberglass composition for higher modulus
A glass composition is provided that includes about 57.0 to 62.0% by weight SiO 2 , about 20.0 to 25.0% by weight Al 2 O 3 , about 8.0 to 12.5% by weight MgO, about 7 to 9.0% by weight CaO, about 0.4 to 1.0% by weight Li 2 O, 0.0 to about 1.0% by weight Na 2 O, about 0 to 0.5% by weight K 2 O; and 0.2 to about 1.5% by weight TiO 2 . The glass composition has a fiberizing temperature of no greater than about 1,300 C. Such applications include woven fabrics for use in forming wind blades and aerospace structures.
1 . A glass composition comprising:
SiO 2 in an amount from 57.0 to 62.0% by weight;
Al 2 O 3 in an amount from 20.0 to 25.0% by weight;
CaO in an amount from 7.0 to 9.0% by weight;
MgO in an amount from 8.0 to 12.5% by weight;
Na 2 O in an amount from 0 to 1.0% by weight;
K 2 O in an amount from 0 to 0.5% by weight;
Li 2 O in an amount from 0.5 to 1.0% by weight; and
TiO 2 in an amount from 0.2 to 1.5% by weight, wherein a weight percent ratio (R1) (MgO+Al 2 O 3 )/(SiO 2 +CaO) is at least 0.47, a weight percent ratio (R3) (MgO/SiO 2 ) is at least 0.19, and wherein the glass composition has a fiberizing temperature no greater than 1,300° C.
2 . The glass composition according to claim 1 , wherein the composition comprises 57.1% by weight to less than 59% by weight SiO 2.
3 . The glass composition according to claim 1 , wherein the composition comprises 7.9% by weight to less than 9.0% by weight CaO.
4 . The glass composition according to claim 1 , wherein the combined amounts of SiO 2 , Al 2 O 3 , MgO, and CaO is at least 98% by weight and less than 99.3% by weight.
5 . The glass composition according to claim 1 , wherein the glass composition is free of rare earth oxides.
6 . The glass composition according to claim 1 , wherein the glass composition comprises greater than 20% to 21% by weight Al 2 O 3.
7 . The glass composition according to claim 1 , wherein the glass composition includes 0.5% to 0.8 wt. % Li 2 O.
8 . The glass composition according to claim 1 , wherein the glass composition is essentially free of B 2 O 3.
9 . The glass composition according to claim 1 , wherein the glass composition includes 0.1 to 0.8% by weight Na2O.
10 . The glass composition according to claim 1 , wherein the glass composition includes a weight percent ratio (R2) (MgO+Al 2 O 3 +Li 2 O)/(CaO+SiO 2 +Na 2 O+K 2 O) that is greater than 0.46.
11 . A method of forming a continuous glass fiber comprising:
providing a molten glass composition according to claim 1 ; and
drawing the molten glass composition through an orifice to form a continuous glass fiber.
12 . A glass composition comprising:
SiO 2 in an amount from greater than 57.0 to 62.0% by weight;
Al 2 O 3 in an amount from 20.0 to 25.0% by weight;
CaO in an amount from 7.0 to 11.5% by weight;
MgO in an amount from 8.0 to 12.5% by weight;
Na2O in an amount from 0 to 1.0% by weight;
K 2 O in an amount from 0 to 0.5% by weight;
Li 2 O in an amount from 0.5 to 0.8% by weight; and
TiO 2 in an amount from 0.2 to 1.5% by weight, wherein a weight percent ratio (R2) (MgO+Al 2 O 3 +Li 2 O)/(CaO+SiO 2 +Na 2 O+K 2 O) that is greater than 0.46, a weight percent ratio (R3) (MgO/SiO 2 ) is at least 0.19, and wherein the glass composition has a fiberizing temperature no greater than 1,300° C.
13 . The glass composition according to claim 12 , wherein the glass composition comprises 57.1% by weight to less than 59% by weight SiO 2 .
14 . The glass composition according to claim 12 , wherein the glass composition comprises 7.9% by weight to less than 9.0% by weight CaO.
15 . The glass composition according to claim 12 , wherein the combined amounts of SiO 2 , Al 2 O 3 , MgO, and CaO is at least 98% by weight and less than 99.3% by weight.
16 . The glass composition according to claim 12 , wherein the glass composition is free of rare earth oxides.
17 . The glass composition according to claim 12 , wherein the glass composition comprises greater than 20% to 21% by weight Al 2 O 3.
18 . The glass composition according to claim 12 , wherein the glass composition includes 0.5% to 0.8 wt. % Li 2 O.
19 . The glass composition according to claim 12 , wherein the glass composition includes 0.1 to 0.8% by weight Na 2 O.
20 . The glass composition according to claim 12 , wherein the glass composition includes a weight percent ratio (R1) (MgO+Al 2 O 3 )/(SiO 2 +CaO) is at least 0.47.
21 . A glass fiber formed from a glass composition comprising:
SiO 2 in an amount from 57.0 to 62.0% by weight;
Al 2 O 3 in an amount from 20.0 to 25.0% by weight;
CaO in an amount from 7.0 to 9.0% by weight;
MgO in an amount from 8.0 to 12.5% by weight;
Na 2 O in an amount from 0 to 1.0% by weight;
K 2 O in an amount from 0 to 0.5% by weight;
Li 2 O in an amount from 0.5 to 1.0% by weight; and
TiO 2 in an amount from 0.2 to 1.5% by weight, wherein a weight percent ratio (R1) (MgO+Al 2 O 3 )/(SiO 2 +CaO) is at least 0.47, a weight percent ratio (R3) (MgO/SiO 2 ) is at least 0.19, and wherein the glass composition has a fiberizing temperature no greater than 1,300° C., and wherein said glass fiber has an elastic modulus of between 90 GPa and 92 GPa.
22 . A glass fiber according to claim 21 , wherein the glass fiber has a density that is at least 2.6 g/cm 3.
23 . A glass fiber according to claim 21 , wherein the glass composition comprises 57.1% by weight to less than 59% by weight SiO 2.
24 . A glass fiber according to claim 21 , wherein the glass composition comprises 7.9% by weight to less than 9.0% by weight CaO.
25 . A glass fiber according to claim 21 , wherein the combined amounts of SiO 2 , Al 2 O 3 , MgO, and CaO is at least 98% by weight and less than 99.3% by weight.
26 . 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 57.0 to 62.0% by weight;
Al 2 O 3 in an amount from 20.0 to 25.0% by weight;
CaO in an amount from 7.0 to 9.0% by weight;
MgO in an amount from 8.0 to 12.5% by weight;
Na 2 O in an amount from 0 to 1.0% by weight;
K20 in an amount from 0 to 0.5% by weight;
Li 2 O in an amount from 0.5 to 1.0% by weight; and
TiO 2 in an amount from 0.2 to 1.5% by weight, wherein a weight percent ratio (R1) (MgO+Al 2 O 3 )/(SiO 2 +CaO) is at least 0.47, a weight percent ratio (R3) (MgO/SiO 2 ) is at least 0.19, and wherein the glass composition has a fiberizing temperature no greater than 1,300° C., and wherein said glass fiber has an elastic modulus of between 90 GPa and 92 GPa.
27 . A reinforced composite product according to claim 26 , wherein the reinforced composite product is in the form of a wind blade.