Low density and high strength fiber glass for ballistic applications
The present invention relates to fabrics, composites, prepregs, laminates, and other products incorporating glass fibers formed from glass compositions. The glass fibers, in some embodiments, are incorporated into composites that can be adapted for use in high energy impact applications such as ballistic or blast resistance applications. Glass fibers formed from some embodiments of the glass compositions can have certain desirable properties that can include, for example, desirable electrical properties (e.g. low D k ) or desirable mechanical properties (e.g., specific strength).
1. A composite comprising:
a polydicyclopentadiene resin; and
a plurality of glass fibers disposed in the polydicyclopentadiene resin, wherein at least one of the plurality of glass fibers comprises a glass composition comprising
SiO 2
60-68
weight percent;
B 2 O 3
7-12
weight percent;
Al 2 O 3
9-15
weight percent;
MgO
8-15
weight percent;
CaO
0-4
weight percent;
Li 2 O
0-2
weight percent;
Na 2 O
0-1
weight percent;
K 2 O
0-1
weight percent;
Fe 2 O 3
0-1
weight percent;
F 2
0-1
weight percent;
TiO 2
0-2
weight percent; and
other constituents
0-5
weight percent total;
wherein the (Li 2 O+Na 2 O+K 2 O) content is less than 2 weight percent, wherein the MgO content is at least twice the content of CaO on a weight percent basis, and wherein the composite is adapted for use in ballistics or blast resistance applications.
2. The composite of claim 1 , wherein the composite exhibits a 0.30 cal FSP V 50 value of at least about 900 fps at an areal density of about 2 lb/ft 2 and a thickness of about 5-6 mm when measured by the U.S. Department of Defense Test Method Standard for V 50 Ballistic Test for Armor, MIL-STD-662F, December 1997.
3. The composite of claim 1 , wherein the composite exhibits a 0.50 cal FSP V 50 value of at least about 1200 fps at an areal density of about 4.8-4.9 lb/ft 2 and a thickness of about 13-13.5 mm when measured by the U.S. Department of Defense Test Method Standard for V 50 Ballistic Test for Armor, MIL-STD-662F, December 1997.
4. The composite of claim 1 , wherein the at least one of the plurality of glass fibers is at least partially coated with a sizing composition.
5. The composite of claim 1 , wherein the plurality of glass fibers are arranged to form a fabric.
6. The composite of claim 5 , wherein the plurality of glass fibers are woven to form the fabric.
7. The composite of claim 5 , wherein the fabric comprises a plain weave fabric, a twill fabric, a crowfoot fabric, a satin weave fabric, a stitch bonded fabric, or a 3D woven fabric.
8. An armor panel comprising the composite of claim 5 .
9. A composite comprising:
a polydicyclopentadiene resin; and
a plurality of glass fibers disposed in the polydicyclopentadiene resin, wherein at least one of the plurality of glass fibers comprises a glass composition comprising
SiO 2
60-77
weight percent;
B 2 O 3
7-12
weight percent;
Al 2 O 3
4.5-18.5
weight percent;
MgO
4-12.5
weight percent;
CaO
0-10.5
weight percent;
Li 2 O
0-2
weight percent;
Na 2 O
0-2
weight percent;
K 2 O
0-1
weight percent;
Fe 2 O 3
0-1
weight percent;
F 2
0-2
weight percent;
TiO 2
0-2
weight percent; and
other constituents
0-5
weight percent total;
wherein the composite is adapted for use in ballistics or blast resistance applications, wherein the (Li2O+Na2O+K2O) content is less than 2 weight percent, and wherein the MgO content is at least twice the content of CaO on a weight percent basis.
10. The composite of claim 9 , wherein the composite exhibits a 0.30 cal FSP V 50 value of at least about 900 fps at an areal density of about 2 lb/ft 2 and a thickness of about 5-6 mm when measured by the U.S. Department of Defense Test Method Standard for V 50 Ballistic Test for Armor, MIL-STD-662F, December 1997.
11. The composite of claim 9 , wherein the composite exhibits a 0.50 cal FSP V 50 value of at least about 1200 fps at an areal density of about 4.8-4.9 lb/ft 2 and a thickness of about 13-13.5 mm when measured by the U.S. Department of Defense Test Method Standard for V 50 Ballistic Test for Armor, MIL-STD-662F, December 1997.
12. The composite of claim 9 , wherein the at least one of the plurality of glass fibers is at least partially coated with a sizing composition.
13. The composite of claim 9 , wherein the plurality of glass fibers are arranged to form a fabric.
14. The composite of claim 13 , wherein the plurality of glass fibers are woven to form the fabric.
15. The composite of claim 13 , wherein the fabric comprises a plain weave fabric, a twill fabric, a crowfoot fabric, a satin weave fabric, a stitch bonded fabric, or a 3D woven fabric.
16. An armor panel comprising the composite of claim 13 .
17. The composite of claim 1 , wherein the Li 2 O content is greater than either the Na 2 O content or the K 2 O content.
18. The composite of claim 9 , wherein the Li 2 O content is greater than either the Na 2 O content or the K 2 O content.