Hybrid carbon-steel firearm barrel
A hybrid metal and composite barrel assembly for a firearm preferably includes a metal inner barrel liner and a composite outer barrel sleeve. The composite outer barrel sleeve preferably includes at least one layer of woven metal mesh material comprising a plurality of metallic fibers, and at least one layer of carbon fiber material comprising a plurality of carbon fibers. The composite outer barrel sleeve is preferably engaged around the metal inner barrel liner, and optionally incorporates a tensioning nut to retain the sleeve on the liner.
1. A firearm comprising a hybrid composite/steel barrel, the barrel further comprising:
a metal inner barrel liner; and
a composite outer barrel sleeve, the composite outer barrel sleeve comprising carbon fibers;
wherein the metal inner barrel liner has an external taper from a larger breech end dimension to a smaller muzzle end dimension, and wherein the composite outer barrel sleeve has an internal taper configured to generally match the external taper of the inner barrel liner and fit in close engagement therewith when assembled, and wherein the composite outer barrel sleeve is adhesively bonded to the metal inner barrel liner; and
wherein the metal inner barrel liner comprises a first thread profile at a muzzle end thereof, and wherein the barrel further comprises a tensioning nut having a second thread profile configured for cooperative engagement with the first thread profile, to engage the composite outer barrel sleeve onto the inner barrel liner.
2. The firearm of claim 1 , wherein the composite outer barrel sleeve is adhesively bonded to the metal inner barrel liner using a thermally conductive epoxy resin.
3. The firearm of claim 1 , wherein the tensioning nut is tightened during assembly of the barrel to place the inner barrel liner in tension and the composite outer barrel sleeve in compression.
4. The firearm of claim 1 , wherein the composite outer barrel sleeve further comprises metallic fibers.
5. The firearm of claim 4 , wherein the barrel defines a length extending in a lengthwise direction from the breech end to the muzzle end, and wherein at least some of the metallic fibers extend along substantially the entire length of the barrel to conduct and dissipate heat in the lengthwise direction.
6. A firearm comprising a hybrid composite/steel barrel, the barrel further comprising:
a metal inner barrel liner; and
a composite outer barrel sleeve, the composite outer barrel sleeve comprising carbon fibers;
wherein the metal inner barrel liner has an external taper from a larger breech end dimension to a smaller muzzle end dimension, and wherein the composite outer barrel sleeve has an internal taper configured to generally match the external taper of the inner barrel liner and fit in close engagement therewith when assembled, and wherein the composite outer barrel sleeve is adhesively bonded to the metal inner barrel liner; and
wherein the composite outer barrel sleeve comprises at least one layer of carbon fiber material comprising the carbon fibers; and at least one layer of woven metal mesh material comprising metallic fibers.
7. The firearm of claim 6 , wherein the woven metal mesh material has a weft wire count of at least 80 metallic fibers per square inch and a warp wire count of at least 80 metallic fibers per square inch.
8. The firearm of claim 6 , wherein the metal mesh material is oriented in the barrel at a zero-degree and ninety-degree fiber orientation, wherein zero-degree fibers of the metal mesh material are generally aligned with a longitudinal bore axis of the barrel and ninety-degree fibers of the metal mesh material are aligned generally transverse to the longitudinal bore axis of the barrel.
9. The firearm of claim 1 , wherein the metal inner barrel liner comprises a rifled internal bore.
10. The firearm of claim 1 , wherein the metal inner barrel liner comprises steel.
11. The firearm of claim 6 , wherein the metallic fibers comprise at least one of stainless steel, steel, aluminum, brass, titanium, nickel, silver, and/or nitinol.
12. The firearm of claim 6 , wherein the carbon fibers at least partially comprise polyacrylonitrile-based carbon fibers.
13. The firearm of claim 6 , wherein the carbon fibers at least partially comprise a carbon fiber uni-directional prepreg tape.
14. The firearm of claim 6 , wherein the carbon fibers at least partially comprise a carbon fiber weave mesh material.
15. The firearm of claim 6 , wherein the composite outer barrel sleeve further comprises a polymeric resin encapsulating at least a portion of the carbon fibers.
16. The firearm of claim 15 , wherein the polymeric resin does not contain metallic particles.
17. The firearm of claim 1 , wherein the composite outer barrel sleeve comprises a plurality of layers staggered with fibers of each layer's starting point offset in increments of about 90 degrees circumferentially from an adjacent layer.
18. The firearm of claim 1 , further comprising a stock portion, the firearm being configured as a rifle, a shotgun, or a handgun.
19. A firearm barrel comprising:
a metal inner barrel liner; and
a composite outer barrel sleeve, the composite outer barrel sleeve comprising carbon fibers;
wherein the metal inner barrel liner has an external taper from a larger breech end dimension to a smaller muzzle end dimension, and wherein the composite outer barrel sleeve has an internal taper configured to generally match the external taper of the inner barrel liner and fit in close engagement therewith when assembled, and wherein the composite outer barrel sleeve is adhesively bonded to the metal inner barrel liner; and
wherein the metal inner barrel liner comprises a first thread profile at a muzzle end thereof, and wherein the firearm barrel further comprises a tensioning nut having a second thread profile configured for cooperative engagement with the first thread profile, to engage the composite outer barrel sleeve onto the inner barrel liner.
20. The firearm barrel of claim 19 , wherein the composite outer barrel sleeve is adhesively bonded to the metal inner barrel liner using a thermally conductive epoxy resin.
21. The firearm barrel of claim 19 , wherein the tensioning nut is tightened during assembly of the firearm barrel to place the inner barrel liner in tension and the composite outer barrel sleeve in compression.
22. A method of fabricating a firearm barrel, the method comprising:
providing a metal inner barrel liner having an external taper from a larger breech end dimension to a smaller muzzle end dimension;
providing a composite outer barrel sleeve having an internal taper configured to generally match the external taper of the inner barrel liner; and
assembling the composite outer barrel sleeve over the metal inner barrel liner with the internal taper of the composite outer barrel sleeve fitting in close engagement with the external taper of the metal inner barrel liner
wherein the metal inner barrel liner comprises a first thread profile at a muzzle end thereof, the method further comprising:
providing a tensioning nut having a second thread profile configured for cooperative engagement with the first thread profile; and
tightening the second thread profile of the tensioning nut onto the first thread profile of the metal inner barrel liner to place the inner barrel liner in tension and the composite outer barrel sleeve in compression.
23. The method of claim 22 , further comprising adhesively bonding the internal taper of the composite outer barrel sleeve to the external taper of the metal inner barrel liner using a thermally conductive epoxy resin.