Glass composition with low coefficient of thermal expansion, and glass fiber produced from same
The present disclosure relates to a glass composition having a low thermal expansion coefficient, specifically, a glass composition comprising about 55 to less than 64 weight percent of silicon oxide, about 15 to about 30 weight percent of aluminum oxide, about 5 to about 15 weight percent of magnesium oxide, about 3 to about 10 weight percent boron oxide, about 0 to about 11 weight percent calcium oxide, and about 0 to about 2 weight percent of alkali oxide, the remainder being trace compounds of less than about 1 weight percent, is provided. Glass fibers and composite articles formed therefrom are also provided.
1. A glass composition comprising the following compounds in the listed weight percent:
SiO 2
60-62.9
Al 2 O 3
22.0-23.7
MgO
8.6-10.0
B 2 O 3
4.2-10
Li 2 O
<2
Na 2 O
<0.1
CaO
<1
K 2 O
<0.1
with the residual elemental composition being less than 1 weight percent.
2. The glass composition of claim 1 , wherein the weight percent ratio of Al 2 O 3 /MgO is greater than 2.3.
3. The glass composition of claim 1 , wherein the glass composition has a liquids temperature between 1320° C. to 1370° C.
4. The glass composition of claim 1 , wherein a glass produced therefrom has a CTE of between 3.0 and 3.6×10 −6 /° C.
5. A glass fiber product manufactured by using the glass composition of claim 1 , being substantially hollow-filament free.
6. An insulating polymer binder or matrix for a printed circuit board assembly comprising a polymer binder or matrix comprising a glass fiber of the glass composition of claim 1 .
7. A printed circuit board comprising an insulating polymer binder or matrix comprising a glass fiber of the glass composition of claim 1 and a circuit pattern formed thereon.
8. A windshield, windscreen, canopy, or transparency comprising the glass fiber of claim 1 .
9. A glass composition comprising the following compounds in the listed weight percent:
SiO 2
>60 and <62
Al 2 O 3
>17 and <23
MgO
>8.5 and <10
B 2 O 3
>5 and <10
Li 2 O
<2
Na 2 O
<0.05
CaO
<1
K 2 O
<0.05
with the residual elemental cot position being less than 1 weight percent.
10. A glass fiber product manufactured by using the glass composition of claim 9 , being substantially hollow-filament free.
11. An insulating polymer binder or matrix for a printed circuit board assembly comprising a polymer binder or matrix comprising a glass fiber of the glass composition of claim 9 .
12. A printed circuit board comprising an insulating polymer binder or matrix comprising a glass fiber of the glass composition of claim 9 and a circuit pattern formed thereon.
13. A transparent fiberglass reinforced composite article comprising a glass fiber composition comprising the following compounds in the listed weight percent:
SiO 2
60-62.9
Al 2 O 3
22.0-23.7
MgO
8.6-10.0
B 2 O 3
4.2-10
Li 2 O
<2
Na 2 O
<0.1
CaO
<1
K 2 O
<0.1
the remainder of said glass fiber composition being trace compounds of less than 1 weight percent; and
a polymer matrix.
14. The transparent fiberglass reinforced composite article of claim 13 , wherein the weight percent ratio of Al 2 O 3 /MgO is greater than 2.3.
15. A windshield, windscreen, canopy, or transparency comprising the transparent fiberglass reinforced composite article of claim 13 .
16. The transparent fiberglass reinforced composite article of claim 13 wherein the glass fiber composition has an index of refraction that differs from that of the polymer matrix by less than 0.005.
17. The transparent fiberglass reinforced composite article comprising a class fiber composition comprising the following compounds in the listed weight percent:
SiO 2
>60 and <62
Al 2 O 3
>17 and <23
MgO
>8.5 and <10
B 2 O 3
>5 and <10
Li 2 O
<2
Na 2 O
<0.05
CaO
<1
K 2 O
<0.05
with the residual elemental composition being less than 1 weight percent; and
a polymer matrix.