The United States of America as Represented by the Secretary of the Army
대리인 / 주소
Wang, Lisa H.
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초록▼
A lightweight mortar tube is presented herein having at least three layers: (1) a first inner bore facing layer comprised of a metal having a melting point greater than 800° C.; (2) a second thermal barrier layer comprised of a ceramic material attached to the first layer, and (3) a third outer shel
A lightweight mortar tube is presented herein having at least three layers: (1) a first inner bore facing layer comprised of a metal having a melting point greater than 800° C.; (2) a second thermal barrier layer comprised of a ceramic material attached to the first layer, and (3) a third outer shell layer attached to the second layer comprising of fiber reinforced composite material where the composite material is either a polymer, metal or ceramic. All of the layers are cohesively integrated with each other into a seamless wall. The improved multi-layered mortar tube described herein is lighter, yet maintains the same performance standards as comparable steel-based mortar tubes.
대표청구항▼
1. A mortar tube comprising: a muzzle end, a breach end, and a longitudinal axis defined by a rigid, circular wall encasing a hollow inner bore, said rigid wall comprising a plurality of heterogeneous layers, wherein the layers comprises;(a) a first inner bore facing layer proximate to the hollow bo
1. A mortar tube comprising: a muzzle end, a breach end, and a longitudinal axis defined by a rigid, circular wall encasing a hollow inner bore, said rigid wall comprising a plurality of heterogeneous layers, wherein the layers comprises;(a) a first inner bore facing layer proximate to the hollow bore, wherein said inner bore facing layer is comprised of a metal material wherein said metal has a melting point above 800° C.;(b) a second thermal barrier layer comprised of a ceramic material; and(c) a third outer shell layer comprised of a fiber reinforced composite material, wherein the plurality of heterogeneous layers are integrated as a seamless wall; and(d) wherein the first and second layers and second and third layers are bonded to each other by a bonding layer. 2. The mortar tube of claim 1, wherein said bonding layer is comprised of MCr, MAl, or MCrAlY, and wherein M is a metal selected from the group consisting of nickel or cobalt, and Cr is chromium, Al is aluminum and Y is yttrium. 3. The mortar tube of claim 1, wherein the metal material is selected from the group consisting of Fe, Co, Ni, Cu, Al, Ti, Cr, V, Mo, Ta, W, and Nb. 4. The mortar tube of claim 1, wherein the metal material is selected from the group consisting of alloys of steel, stainless steel, nickel or cobalt. 5. The mortar tube of claim 1, wherein the metal material is selected from the group of superalloys, titanium alloys, and refractory alloys. 6. The mortar tube of claim 1, wherein the metal material is a nickel-based superalloy. 7. The mortar tube of claim 1, wherein the ceramic material is selected from the group comprising of yttria-stabilized zirconia, ceria-stabilized zirconia, alumina, mullite, zirconates, silica, polymer-derived ceramics and combinations thereof. 8. The mortar tube of claim 1, wherein the fiber reinforced composite layer is comprised of continuous fibers set in a matrix comprised of a polymer base, metal or ceramic material. 9. The mortar tube of claim 8, wherein the continuous fibers are selected from the group consisting of carbon, Al2O3, SiC, boron, and fiberglass. 10. The mortar tube of claim 1, wherein the outer shell layer is thicker at the breach end relative to the muzzle end. 11. The mortar tube of claim 1, wherein the thickness of the outer shell layer is greater than the thickness of the first inner layer or the second thermal barrier layer. 12. A mortar tube comprising: a muzzle end, a breach end, and a longitudinal axis defined by a seamless, rigid, circular wall encasing a hollow inner bore, said rigid wall comprising a plurality of heterogeneous layers, wherein the layers comprises;(a) a first inner bore facing layer proximate to the hollow bore, wherein said inner bore facing layer is comprised of a metal material wherein said metal has a melting point above 1200° C.;(b) a second thermal barrier layer comprised of a ceramic material selected from the group comprising of yttria-stabilized zirconia, ceria-stabilized zirconia, alumina, mullite, zirconates, silica, polymer-derived ceramics and combinations thereof; and(c) a third outer shell layer comprising a fiber reinforced composite material comprised of fibers set in a polymer, metal or ceramic matrix;wherein the first and second and second and third layers are bonded to each other by a bonding layer, said bonding layer comprising MCrAlY, wherein M is a metal consisting of nickel or cobalt, and Cr is chromium, Al is aluminum and Y is yttrium.
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