Firearm handguard having heat-reducing features
A handguard comprising a plurality of layers of composite material. At least one of the layers is a ceramic matrix composite and at least one of the layers, and preferably the outer later, is a carbon fiber reinforced composite. In addition, the outermost layer is preferably a woven fabric carbon fiber reinforced composite. In one embodiment, one or more ceramic matrix composite layers is sandwiched between layers of carbon fiber reinforced composite. In another embodiment, an innermost layer is a ceramic matrix composite and the outermost layer is a carbon fiber reinforced composite.
1. A handguard for a firearm having a barrel nut, the handguard comprising:
a body comprising a plurality of layers of composite material, a fore end, a butt end, the butt end being adapted to be removably-secured to the barrel nut, the plurality of layers of composite material comprising an outer layer, an inner layer, and at least one intermediate layer, each of the at least one intermediate layer being sandwiched between the outer layer and the inner layer,
wherein the inner layer comprises a ceramic matrix composite layer, the outer layer comprises a carbon-reinforced composite layer.
2. The handguard of claim 1 , wherein the at least one intermediate layer comprises a carbon-reinforced composite layer.
3. The handguard of claim 1 , wherein the outer layer, inner layer and the ceramic matrix composite layer being arranged so that no portion of the ceramic matrix composite layer is exposed to the external surface of the body.
4. The handguard of claim 1 , wherein each of the at least one intermediate layer comprises a ceramic matrix composite layer.
5. The handguard of claim 1 , wherein the outer and at least one intermediate layers each comprise a carbon-reinforced composite layer comprised of a woven carbon fiber fabric.
6. The handguard of claim 5 , wherein at least one of the intermediate layers comprises a carbon-reinforced composite layer having at least one selected from the group of: unidirectional carbon fibers and randomly-arranged, chopped carbon fibers.
7. The handguard of claim 1 , wherein the handguard has an upper portion and lower portion and the ceramic matrix composite layer is located only in the lower portion.
8. The handguard of claim 7 , wherein the body includes a lowermost point and a centerline, the lower portion including the lowermost point and extending at least 60 degrees in each direction from the centerline.
9. The handguard of claim 1 , wherein the body has a body thickness and each of the plurality of layers comprising a ceramic matrix composite has a layer thickness, and the sum of the layer thicknesses equals between 10 and 25% of the body thickness.
10. The handguard of claim 7 , further comprising:
an accessory rail mounted to the upper portion of the handguard.
11. The handguard of claim 1 , wherein at least one of the plurality of layers comprises a heat-reflective filler.
12. The handguard of claim 11 , wherein the heat-reflective filler comprises at least one selected from the group of: a micron-scale ceramic, zirconia and aluminia.
13. The handguard of claim 1 , wherein each of the least one of the plurality of layers comprises a resin, the resin of at least one of the plurality of layers comprising a high-temperature resin.
14. The handguard of claim 13 , wherein the high-temperature resin is selected from the group of: polyimide, a bis-maleimide, and polyether ether ketone.
15. The handguard of claim 13 , wherein the inner layer comprises a high-temperature resin.
16. The handguard of claim 1 , wherein the body includes a plurality of openings formed therein.