Glass compositions, fiberizable glass compositions, and glass fibers made therefrom
Glass compositions suitable for fiber forming having rare earth oxides (RE 2 O 3 ) and glass fibers having a high modulus are disclosed. The glass composition may include SiO 2 from about 44.5 to about 64 weight percent, Al 2 O 3 from about 12 to about 32 weight percent, CaO from about 0.1 to about 15.5 weight percent, MgO from about 5 to about 22 weight percent, Fe 2 O 3 less than 1 weight percent, TiO 2 less than 2 weight percent, Na 2 O less than 3 weight percent, Y 2 O 3 up to 12 weight percent, CeO 2 up to 6 weight percent, ZnO up to 4 weight percent, and B 2 O 3 less than 4.5 weight percent. The glass compositions can be used to form glass fibers and incorporated into various composites.
1 . A glass composition suitable for fiber forming comprising:
SiO 2 from 44.5 to 64 weight percent;
Al 2 O 3 from 12 to 32 weight percent;
CaO from 0.1 to 15.5 weight percent;
MgO from 5 to 22 weight percent;
Fe 2 O 3 less than 1 weight percent;
TiO 2 less than 2 weight percent;
Na 2 O less than 3 weight percent;
Li 2 O is present up to 0.6 weight percent;
ZnO up to 4 weight percent;
one or more rare earth oxide up to 12 weight percent, wherein the one or more rare earth oxide comprises CeO 2 ;
F 2 is present up to 0.02 weight percent; and
B 2 O 3 less than 4.5 weight percent.
2 . The glass composition of claim 1 , wherein the one or more rare earth oxide further comprises Y 2 O 3 .
3 . The glass composition of claim 1 , wherein a ratio of CaO to MgO, (CaO/MgO), is less than 2.0.
4 . The glass composition of claim 1 , wherein a total (SiO 2 +Al 2 O 3 ) content is greater than 70 weight percent.
5 . The glass composition of claim 1 , wherein a ratio of Al 2 O 3 to RO (Al 2 O 3 /RO) is less than 5, wherein RO is the sum of MgO, CaO, and ZnO.
6 . The glass composition of claim 1 , wherein a total (MgO+CaO) content ranges from 6 to 24 weight percent.
7 . The glass composition of claim 1 , wherein the composition is substantially free of B 2 O 3 .
8 . A plurality of glass fibers formed from the glass composition of claim 1 .
9 . The plurality of glass fibers of claim 8 , wherein the glass fibers have a Young's modulus greater than 86 GPa.
10 . The plurality of glass fibers of claim 8 , wherein the glass fibers have a density less than 2.8 g/cm 3 .
11 . The plurality of glass fibers of claim 8 , wherein the glass fibers can be drawn at a fiber actual drawing temperature (T F actual ) of at least 60° C. above a liquidus temperature (T L ) of the glass fibers.
12 . The plurality of glass fibers of claim 8 , wherein the glass fibers have a Specific modulus of greater than 3.2×10 6 m.
13 . A fiber glass strand comprising the plurality of glass fibers of claim 8 .
14 . A roving comprising the plurality of glass fibers of claim 8 .
15 . A yarn comprising the plurality of glass fibers of claim 8 .
16 . A woven fabric comprising the plurality of glass fibers of claim 8 .
17 . A non-woven fabric comprising the plurality of glass fibers of claim 8 .
18 . A chopped fiber glass strand comprising the plurality of glass fibers of claim 8 .
19 . A polymeric composite comprising:
a polymeric material; and
a plurality of glass fibers formed from the glass composition of claim 1 .
20 . An article of manufacture comprising a plurality of glass fibers formed from the glass composition of claim 1 .