Fiber Tow Comprising Carbon-Nanotube-Infused Fibers

• US 20090081441A1
• Filed: 09/22/2008
• Published: 03/26/2009
• Est. Priority Date: 09/20/2007
• Status: Abandoned Application

• Current Assignee: Applied NanoStructured Solutions, LLC (Cabot Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Malecki, Harry C., Shah, Tushar K., Alberding, Mark R.
• Application Number:
  US12/235,317
• Publication Number:
  US 20090081441A1
• Time in Patent Office: Days
• US Class Current: 428/222
• CPC Class Codes: B29C 70/081 Combinations of fibres of continuous or substantial length and short fibres
• CPC Class Codes: B29C 70/16 using fibres of substantial or continuous length non-woven fabrics per se D04H3/00
• CPC Class Codes: Y10T 428/249922 Embodying intertwined or helical component[s]

Abstract

Fiber tows are formed by situating carbon-nanotube-infused filaments in close proximity to one another, enabling the nanotubes on the filaments to interdigitate. In some embodiment, this enables the formation of fiber tows that do not require do not require resin impregnation.

Claims

1. An article comprising a fiber tow, wherein the fiber tow comprises a plurality of carbon-nanotube-infused filaments, and wherein the fiber tow is not impregnated with resin.

2. The article of claim 1 wherein adjacent filaments in the fiber tow are spaced apart from one another by a distance of less than about 1 nanometer.

3. The article of claim 1 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a first fabric, and wherein the first fabric is not impregnated with resin.

4. The article of claim 3 further comprising:

a second fabric, wherein the second fabric comprises a second plurality of fiber tows that are woven together and wherein the second fabric is not impregnated with resin, and resin, wherein the resin couples the first fabric and the second fabric together.

5. The article of claim 1 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a ribbon, and wherein the ribbon is not impregnated with resin.

6. The article of claim 1 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a tape, and wherein the tape is not impregnated with resin.

7. The article of claim 1 wherein the fiber tow comprises a plurality of helical arrangements of carbon-nanotube-infused filaments, the helical arrangements exhibiting intra-helix bonding wherein carbon-nanotube-infused filaments within a helical arrangements interdigitate, and the helical arrangements further exhibit inter-helix bonding wherein carbon-nanotube-infused filaments within different helical arrangements interdigitate with one another.

8. The article of claim 7 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a first fabric, and wherein the first fabric is not impregnated with resin.

9. The article of claim 8 further comprising:

a second fabric, wherein the second fabric comprises a second plurality of fiber tows that are woven together and wherein the second fabric is not impregnated with resin, and

resin, wherein the resin couples the first fabric and the second fabric together.

10. The article of claim 7 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a ribbon, and wherein the ribbon is not impregnated with resin.

11. The article of claim 7 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a tape, and wherein the tape is not impregnated with resin.

12. An article comprising a fiber tow, the fiber tow including a plurality of helical arrangements of carbon-nanotube-infused filaments, wherein, within each helical arrangement, two or more carbon-nanotube-infused filaments are helically twisted about each other, and wherein the fiber tow is not impregnated with resin.

13. The article of claim 12 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a first fabric, and wherein the first fabric is not impregnated with resin.

14. The article of claim 13 further comprising:

a second fabric, wherein the second fabric comprises a second plurality of fiber tows that are woven together and wherein the second fabric is not impregnated with resin, and

resin, wherein the resin couples the first fabric and the second fabric together

15. The article of claim 13 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a ribbon, and wherein the ribbon is not impregnated with resin.

16. The article of claim 13 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a tape, and wherein the tape is not impregnated with resin.

17. An article comprising a fiber tow, wherein the fiber tow comprises a plurality of carbon-nanotube-infused filaments and resin.

18. The article of claim 17 wherein the fiber tow comprises a plurality of helical arrangements of carbon-nanotube-infused filaments, wherein, within each helical arrangement, two or more carbon-nanotube-infused filaments are helically twisted about each other.

19. The article of claim 18 further comprising a first plurality of fiber tows, wherein the first plurality of fiber tows collectively comprise a first fabric.

20. The article of claim 19 further comprising:

a second fabric, wherein the second fabric comprises a second plurality of fiber tows including a plurality of helical arrangements of carbon-nanotube-infused filaments, wherein the first fabric and the second fabric are woven together; and

resin, wherein the resin couples the first fabric and the second fabric together.

21. A method for forming a first fiber tow, comprising:

forming a plurality of carbon-nanotube-infused fibers;

forming sub groupings of at least two of the fibers;

twisting the fibers within each sub grouping to form a plurality of helical arrangements.

22. The method of claim 21 further comprising impregnating the first fiber tow with resin.

23. The method of claim 21 further comprising subjecting the helical arrangements to elevated pressure.