초록 ▼

A glass composition including SiO2 in an amount from about 70.0 to about 78.2% by weight, Al2O3 in an amount from about 18.6 to about 26.2% by weight, MgO in an amount from about 3.1 to about 10.7% by weight, CaO in an amount from 0.0 to about 7.6% by weight, Li2O in an amount from about 0.1 to abou

A glass composition including SiO2 in an amount from about 70.0 to about 78.2% by weight, Al2O3 in an amount from about 18.6 to about 26.2% by weight, MgO in an amount from about 3.1 to about 10.7% by weight, CaO in an amount from 0.0 to about 7.6% by weight, Li2O in an amount from about 0.1 to about 5.0% by weight, and Na2O in an amount from 0.0 to about 0.2% by weight is provided. In exemplary embodiments, the glass composition is free or substantially free of B2O3 and fluorine. The glass fibers have a specific strength between about 1.6×106 J/kg and 2.24×106 J/kg and a specific modulus between about 3.3×107 J/kg and 3.7×107 J/kg. Glass fibers formed from the inventive composition possess exceptionally high specific strength and a low density, which make them particularly suitable in applications that require high strength, high stiffness, and low weight, such as in wind blades and aerospace structures.

대표청구항 ▼

1. A composition for preparing high strength, light weight glass fibers, the composition comprising: SiO2 in an amount from 71.27 to 78.2% by weight of the total composition,Al2O3 in an amount from 18.0 to 26.2% by weight of the total composition,MgO in an amount from 3.1 to 10.7% by weight of the t

1. A composition for preparing high strength, light weight glass fibers, the composition comprising: SiO2 in an amount from 71.27 to 78.2% by weight of the total composition,Al2O3 in an amount from 18.0 to 26.2% by weight of the total composition,MgO in an amount from 3.1 to 10.7% by weight of the total composition,CaO in an amount from 0.0 to 2.0% by weight of the total composition,Li2O in an amount from 0.1 to 2.0% by weight of the total composition,Na2O in an amount from 0.0 to 0.2% by weight of the total composition, andZrO2 in an amount from 0.0 to 1.0% by weight of the total composition;wherein the composition is substantially free of B2O3. 2. The composition of claim 1, wherein: Al2O3 is present in an amount from 18.6 to 26.2% by weight of the total composition. 3. The composition of claim 1, wherein: SiO2 is present in an amount from 71.27 to 73.0% by weight of the total composition,Al2O3 is present in an amount from 18.6 to 21.0% by weight of the total composition, andMgO is present in an amount from 8.0 to 10.7% by weight of the total composition. 4. The composition of claim 1, wherein: SiO2 is present in an amount from 71.27 to 72.67% by weight of the total composition,Al2O3 is present in an amount from 18.6 to 20.67% by weight of the total composition,MgO is present in an amount from 4.74 to 10.7% by weight of the total composition,CaO is present in an amount from 0.0 to 1.89% by weight of the total composition,Li2O is present in an amount from 0.1 to 1.43% by weight of the total composition, andNa2O in an amount from 0.0 to 0.05% by weight of the total composition. 5. The composition of claim 1, wherein: SiO2 is present in an amount from 71.27 to 72.49% by weight of the total composition,Al2O3 is present in an amount from 18.6 to 20.49% by weight of the total composition,MgO is present in an amount from 4.99 to 10.7% by weight of the total composition,CaO is present in an amount from 0.0 to 1.89% by weight of the total composition,Li2O is present in an amount from 0.1 to 0.2% by weight of the total composition, andNa2O in an amount from 0.0 to 0.05% by weight of the total composition. 6. The composition of claim 1, wherein: SiO2 is present in an amount from 71.27 to 72.67% by weight of the total composition,Al2O3 is present in an amount from 18.6 to 20.67% by weight of the total composition,MgO is present in an amount from 3.77 to 10.7% by weight of the total composition,CaO is present in an amount from 0.0 to 2.07% by weight of the total composition,Li2O is present in an amount from 0.1 to 2.0% by weight of the total composition, andNa2O in an amount from 0.0 to 0.05% by weight of the total composition. 7. The composition of claim 6, wherein: MgO is present in an amount from 4.74 to 10.7% by weight of the total composition. 8. The composition of claim 1, wherein the composition is substantially free of fluorine. 9. The composition of claim 1, wherein the composition has a ΔT no greater than 87°C. 10. The composition of claim 1, wherein the composition has a log 3 temperature from 1,340° C. to 1,650° C. 11. The composition of claim 1, wherein the composition has a liquidus temperature no greater than 1,700° C. 12. The composition of claim 1, wherein the composition is prepared in a refractory tank melter. 13. The composition of claim 1, wherein SiO2 is present in an amount from 71.27 to 73.0% by weight of the total composition. 14. The composition of claim 1, wherein Al2O3 is present in an amount from 18.6 to 21.0% by weight of the total composition. 15. The composition of claim 1, wherein MgO is present in an amount from 8.0 to 10.7% by weight of the total composition.