Methods for producing composite structures using diffusion or thermal reactions of a plurality of layers

Patent metadata

Field	Value
Publication number	US-11060194-B2
Application number	US-201715849657-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Dec 21, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Apparatuses and methods of manufacturing of thermally formed composite structures, such as a projectile firing structure, are provided. One simplified exemplary method includes: determining material properties of a projectile firing structure comprising a rifled barrel including thermal conductivity, wear, and tensile strength; wrapping a plurality of thermally reactive layers onto a cylindrical press form structure, the cylindrical press form structure comprising a plurality of spiraled grooves and lands, the thermally reactive layers comprising metal or metal oxides that when heated produce thermal diffusion byproducts in a composite structure forming the rifled barrel having the plurality of material properties; disposing an enclosing structure around the thermally reactive layers wrapped around the cylindrical press form structure; and heating the plurality of thermally reactive layers at a temperature and time so that the plurality of thermally reactive layers thermally react via thermal diffusion forming the rifled barrel having the plurality of material properties.

First claim

The invention claimed is:

1. A method of manufacturing of a projectile firing structure comprising:
determining a plurality of material properties of a projectile firing structure comprising a rifled barrel including thermal conductivity, wear, and tensile strength;
providing and wrapping a plurality of thermally reactive layers onto a cylindrical press form structure, the cylindrical press form structure comprising a plurality of spiraled grooves and lands disposed on an outer surface of the cylindrical press form structure, the thermally reactive layers comprising metal or metal oxides that when heated produce thermal diffusion byproducts in a composite structure forming the rifled barrel having the plurality of material properties;
disposing an enclosing structure around the thermally reactive layers wrapped around the cylindrical press form structure; and
heating the plurality of thermally reactive layers at a sufficient temperature and time so that the plurality of thermally reactive layers thermally react via thermal diffusion forming the rifled barrel having the plurality of material properties.

2. A method of manufacturing of a projectile firing structure comprising:
determining a plurality of material properties of a projectile firing structure including thermal conductivity, wettability, and tensile strength;
providing a first, second, and third hollow cylinder, a plurality of reactive layers, and a first, second, and third reactive powder mixture;
forming a composite assembly by forcing the plurality of reactive layers into a first predetermined shape while dispersing the first reactive powder mixture between each reactive layer of the plurality of reactive layers, wherein the first predetermined shape comprises a fourth hollow cylinder with plurality of lands and grooves along an inner surface of the fourth hollow cylinder;
forming a first composite structure by forcing the composite assembly into the first hollow cylinder with an interference fit;
forming a second composite structure by dispersing a second reactive powder mixture on an outer surface of the first hollow cylinder and on an inner surface of the second hollow cylinder and forcing the first composite structure into the second hollow cylinder with an interference fit;
forming a third composite structure by dispersing a third reactive powder mixture on an outer surface of the second hollow cylinder and on an inner surface of the third hollow cylinder and forcing the second composite structure into the third hollow cylinder with an interference fit; and
heating the third composite structure to initiate a self-sustaining exothermic reaction that fuses the plurality of reactive layers, the first reactive powder mixture, and the first hollow cylinder, fuses the first hollow cylinder, the second reactive powder mixture, and the second hollow cylinder, and fuses the second hollow cylinder, the third reactive powder mixture, and the third hollow cylinder;
wherein the plurality of reactive layers comprises steel;
wherein the first hollow cylinder comprises a nickel based super alloy;
wherein the second hollow cylinder comprises titanium;
wherein the third hollow cylinder comprises copper;
wherein the first reactive powder mixture comprises titanium and carbon;
wherein the second reactive powder mixture comprises titanium, nickel, and carbon;
wherein the third reactive powder mixture comprises titanium, copper, and carbon.

Assignees

• Us Navy

Inventors

• Deshpande Nishkamraj U
• Crowley Daniel R

Classifications

• C23C8/60

  using solids, e.g. powders, pastes (using liquid suspensions of solids C23C8/40) · CPC title

• C23C8/68

  Boronising · CPC title

• C23C10/28

  using solids, e.g. powders, pastes · CPC title

• B32B15/015

  the said other metal being copper or nickel or an alloy thereof · CPC title

• F41A21/02

  Composite barrels, i.e. barrels having multiple layers, e.g. of different materials · CPC title