High refractive index glass composition
View Patent ↗A glass composition including SiO 2 in an amount from 30.0 to 40.0% by weight, Al 2 O 3 in an amount from 15.0 to 23.0% by weight, B 2 O 3 in an amount from 0.0 to 15.0% by weight, K 2 O in an amount from 0.0 to 5.0% by weight, La 2 O 3 in an amount from 0.0 to 30.0% by weight, Li 2 O in an amount from 0.0 to 3.0% by weight, Na 2 O in an amount from 0.0 to 4.0% by weight, Nb 2 O 5 in an amount from 0.0 to 10.0% by weight, TiO 2 in an amount from 0.0 to 7.5% by weight, WO 3 in an amount from 0.0 to 10.0% by weight, Y 2 O 3 in an amount from 15.0 to 35.0% by weight, and RO (one or more of MgO, CaO, SrO, and BaO) in an amount from 0.0 to 7.5% by weight is provided. Glass fibers formed from the composition have a refractive index between 1.55 and 1.69.
1. A composition for preparing glass fibers having a refractive index between about 1.55 and about 1.69, the composition comprising:
SiO 2 in an amount from 30.0 to 40.0% by weight;
Al 2 O 3 in an amount from 15.0 to 23.0% by weight;
Y 2 O 3 in an amount from 15.0 to 35.0% by weight;
B 2 O 3 in an amount from 5.0 to 15.0% by weight;
K 2 O in an amount from 0.0 to 5.0% by weight;
La 2 O 3 in an amount from 0.0 to 30.0% by weight;
Li 2 O in an amount from 0.0 to 3.0% by weight;
Na 2 O in an amount from 0.0 to 4.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 10.0% by weight;
TiO 2 in an amount from 0.0 to 7.5% by weight;
WO 3 in an amount from 0.0 to 10.0% by weight; and
RO in an amount from 0.0 to 7.5% by weight, wherein RO is one or more of MgO, CaO, SrO, and BaO.
2. The composition of claim 1 , wherein said composition has a ΔT up to about 77° C.
3. The composition of claim 1 , wherein said composition has a ΔT from about −170° C. to about 77° C.
4. The composition of claim 1 , wherein said composition has a log 3 temperature that is less than about 1443° C.
5. The composition of claim 1 , wherein said composition has a liquidus temperature greater than about 1531° C.
6. The composition of claim 1 , wherein said composition is substantially free of fluorine and lead.
7. The composition of claim 1 , wherein said composition comprises:
SiO 2 in an amount from 30.0 to 33.0% by weight;
Al 2 O 3 in an amount from 16.0 to 22.0% by weight;
Y 2 O 3 in an amount from 17.0 to 33% by weight;
B 2 O 3 in an amount from 5.0 to 10.0% by weight;
La 2 O 3 in an amount from 10.0 to 26.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 2.0% by weight; and
TiO 2 in an amount from 0.0 to 1.5% by weight.
8. A continuous glass fiber comprising:
a glass composition comprising:
SiO 2 in an amount from 30.0 to 40.0% by weight;
Al 2 O 3 in an amount from 15.0 to 23.0% by weight;
Y 2 O 3 in an amount from 15.0 to 35.0% by weight;
B 2 O 3 in an amount from 0.0 to 15.0% by weight;
K 2 O in an amount from 0.0 to 5.0% by weight;
La 2 O 3 in an amount from 0.0 to 30.0% by weight;
Li 2 O in an amount from 0.0 to 3.0% by weight;
Na 2 O in an amount from 0.0 to 4.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 10.0% by weight;
TiO 2 in an amount from 0.0 to 7.5% by weight;
WO 3 in an amount from 0.0 to 10.0% by weight; and
RO in an amount from 0.0 to 5.0% by weight, wherein RO is one or more of MgO, CaO, SrO, and BaO, wherein said glass fiber has a refractive index between about 1.55 and about 1.69.
9. The glass fiber of claim 8 , wherein said composition is substantially free of fluorine and lead.
10. The glass fiber of claim 8 , wherein said glass fiber has an Abbe number less than about 65 and a coefficient of thermal expansion less than about 66×10 −7 cm/cm.
11. A reinforced composite product comprising:
a polymer matrix; and
a plurality of glass fibers, said glass fibers being produced from a composition comprising:
SiO 2 in an amount from 30.0 to 40.0% by weight;
Al 2 O 3 in an amount from 15.0 to 23.0% by weight;
Y 2 O 3 in an amount from 15.0 to 35.0% by weight;
B 2 O 3 in an amount from 5.0 to 15.0% by weight;
K 2 O in an amount from 0.0 to 5.0% by weight;
La 2 O 3 in an amount from 0.0 to 30.0% by weight;
Li 2 O in an amount from 0.0 to 3.0% by weight;
Na 2 O in an amount from 0.0 to 4.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 10.0% by weight;
TiO 2 in an amount from 0.0 to 7.5% by weight;
WO 3 in an amount from 0.0 to 10.0% by weight; and
RO in an amount from 0.0 to 7.5% by weight, wherein RO is one or more of MgO, CaO, SrO, and BaO.
12. The composite product of claim 11 , wherein said glass fibers have an Abbe number less than about 65.
13. The composite product of claim 12 , wherein said glass fibers have a coefficient of thermal expansion less than about 66×10 −7 cm/cm.
14. The composite product of claim 12 , wherein said refractive index is between about 1.55 and about 1.65 and said Abbe number is less than about 60.
15. A reinforced composite product comprising:
a polymer matrix; and
a plurality of glass fibers, said glass fibers being produced from a composition comprising:
SiO 2 in an amount from 30.0 to 33.0% by weight;
Al 2 O 3 in an amount from 16.0 to 22.0% by weight;
Y 2 O 3 in an amount from 17.0 to 33% by weight;
B 2 O 3 in an amount from 5.0 to 10.0% by weight;
K 2 O in an amount from 0.0 to 5.0% by weight;
La 2 O 3 in an amount from 10.0 to 26.0% by weight;
Li 2 O in an amount from 0.0 to 3.0% by weight;
Na 2 O in an amount from 0.0 to 4.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 2.0% by weight;
TiO 2 in an amount from 0.0 to 1.5% by weight;
WO3 in an amount from 0.0 to 10.0% by weight; and
RO in an amount from 0.0 to 7.5% by weight, wherein RO is one or more of MgO, CaO, SrO, and BaO.
16. The composite product of claim 11 , wherein said composition is substantially free of fluorine and lead.
17. The composite product of claim 11 , wherein said polymer matrix is polymer selected from the group consisting of polyesters, polypropylene, polyamide, polyethylene terephtalate, polybutylene, epoxy resins, unsaturated polyesters, phenolics, vinylesters and combinations thereof.
18. A method of forming glass fibers comprising:
providing a molten glass composition including:
SiO 2 in an amount from 30.0 to 40.0% by weight;
Al 2 O 3 in an amount from 15.0 to 23.0% by weight;
Y 2 O 3 in an amount from 15.0 to 35.0% by weight;
B 2 O 3 in an amount from 0.0 to 15.0% by weight;
K 2 O in an amount from 0.0 to 5.0% by weight;
La 2 O 3 in an amount from 0.0 to 30.0% by weight;
Li 2 O in an amount from 0.0 to 3.0% by weight;
Na 2 O in an amount from 0.0 to 4.0% by weight;
Nb 2 O 5 in an amount from 0.0 to 10.0% by weight;
TiO 2 in an amount from 0.0 to 7.5% by weight;
WO 3 in an amount from 0.0 to 10.0% by weight; and
RO in an amount from 0.0 to 5.0% by weight, wherein RO is one or more of MgO, CaO, SrO, and BaO; and
drawing said molten glass composition through orifices in a bushing to form a glass fiber, wherein said glass fiber has a refractive index between about 1.55 and about 1.69.
19. The method of claim 18 , wherein said glass fiber has an Abbe number less than about 65.
20. The method of claim 19 , wherein said composition is substantially free of fluorine and lead.
21. The method of claim 20 , wherein said glass fiber has a coefficient of thermal expansion less than about 66×10 −7 cm/cm.