Coated substrate systems and methods

Patent metadata

Field	Value
Publication number	US-9939241-B2
Application number	US-201514939665-A
Country	US
Kind code	B2
Filing date	Nov 12, 2015
Priority date	Nov 12, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

An apparatus, comprising: a substrate configured into a casing, a propellant configured between a projectile positioned/configured within the casing and an end of the casing, the propellant configured to expand upon a firing event and project the projectile from the casing; and a coating comprising a conformal coating layer having a particulate boron nitride dispersed therein, wherein the coating is configured to cover at least one of the inner sidewall and the outer sidewall, such that at least one side of the substrate is covered by the coating.

First claim

What is claimed is:

1. An apparatus, comprising:
an aluminum substrate configured into a casing, the casing having at least one sidewall such that the casing includes an inner sidewall and an outer sidewall, the casing configured such that it has two opposing ends comprising a first end and a second end;
a projectile configured to sit within and be retained by the casing and positioned adjacent to the first end;
a propellant, the propellant configured between the projectile and the second end of the casing, the propellant configured to expand upon a firing event and project the projectile from the casing; and
a coating comprising a conformal coating layer having a fluoropolymer and a particulate hexagonal boron nitride therein, wherein the hexagonal boron nitride is PUHP 1106 hexagonal boron nitride configured in a flat plate configuration parallel to a surface of the substrate;
wherein the coating is configured to cover at least one of the inner sidewall and the outer sidewall, such that at least one side of the substrate is covered by the coating; wherein via the hexagonal boron nitride configuration, the substrate with the coating is configured for the firing event.

2. The apparatus of claim 1 , wherein the coating is configured to cover the inner sidewall and the outer sidewall of the casing such that the casing is encased within the coating.

3. The apparatus of claim 1 , wherein the casing comprises an ammunition casing.

4. The apparatus of claim 1 , wherein the casing comprises an ammunition casing of: 5.56 mm NATO; .223 Remington; 9 mm; .40 Caliber S&W; or a .45 ACP.

5. The apparatus of claim 1 , wherein the casing comprising a cartridge for squib for a power tool.

6. The apparatus of claim 1 wherein the substrate is selected from the group consisting of: aluminum, aluminum alloys 2xxx, 6xxx, and 7xxx series aluminum alloys, 2024, 6055, 7075, 7085, magnesium, titanium, steel, plastic, and polymers.

7. An apparatus, comprising:
a substrate configured into a casing, the casing having at least one sidewall such that the casing includes an inner sidewall and an outer sidewall, the casing configured such that it has two opposing ends comprising a first end and a second end;
a projectile configured to sit within and be retained by the casing and positioned adjacent to the first end;
a propellant, the propellant configured between the projectile and the second end of the casing, the propellant configured to expand upon a firing event and project the projectile from the casing; and
a coating comprising a fluoropolymer layer having a particulate hexagonal boron nitride therein, wherein the coating comprises a fluoropolymer portion and at least 30 wt. % to not greater than 70 wt. % of the particulate hexagonal boron nitride configured to be dispersed within the fluoropolymer portion wherein the hexagonal boron nitride is configured in a flat plate configuration parallel to a surface of the substrate,
wherein the coating is configured to cover at least one of the inner sidewall and the outer sidewall, such that at least one side of the substrate is covered by the coating.

8. An apparatus, comprising:
an ammunition cartridge casing comprising an aluminum substrate configured to retain a projectile and a propellant, wherein the ammunition cartridge casing is configured with a coating thereon, wherein the coating includes: a fluoropolymer portion and at least 30 wt. % to not greater than 70 wt. % of a hexagonal boron nitride additive configured to be dispersed within the fluoropolymer portion wherein the hexagonal boron nitride is configured in a flat plate configuration parallel to the surface of a substrate;
wherein the coating is configured to cover at least one of an inner sidewall and an outer sidewall of the ammunition cartridge casing, such that at least one side of the aluminum substrate is covered by the coating; wherein via a configuration of the hexagonal boron nitride additive, the aluminum substrate with the coating is configured for a firing event yielding a pressure of at least 40 ksi for a duration of at least 2.2 ms.

9. The apparatus of claim 8 , wherein the fluoropolymer portion is configured to cover the substrate by completely encasing the substrate.

10. The apparatus of claim 8 , wherein the ammunition cartridge casing is capable of withstanding a temperature during the firing event of not greater than 3000° C.

11. The apparatus of claim 8 , wherein the coating is a sacrificial coating configured to be lost, burned off, or removed from the substrate as a result of the firing event.

12. The apparatus of claim 8 , wherein the coating is configured on an outside of the ammunition cartridge casing.

13. The apparatus of claim 8 , wherein the coating is configured on an inside of the ammunition cartridge casing.

14. The apparatus of claim 8 , wherein the coating is configured to encase the substrate by completely covering and surrounding an inside, an outside, and an upper lip/opening, along with a base of the ammunition cartridge casing.

15. The apparatus of claim 8 , wherein the hexagonal boron nitride additive is surface treated.

16. The apparatus of claim 8 , wherein via a visual observation, the ammunition cartridge casing does not exhibit at least one of: a burn through event; a burning; an erosion; a melting; and combinations thereof, as qualified via the visual observation after the firing event.

17. The apparatus of claim 8 , wherein the coating is configured to insulate the substrate from a heat and a pressure of the firing event.

18. The apparatus of claim 8 , wherein the coating is configured to isolate the substrate from contact with a gas released during the firing event.

19. The apparatus of claim 8 , wherein the coating comprises an organic conformal coating.

20. The apparatus of claim 8 , wherein the coating comprises a fluoropolymer; a solvent, and at least one additive.

21. An apparatus, comprising:
a cartridge case comprising an aluminum substrate formed of the cartridge case having: a base, a perimetrical sidewall configured to surround the base and extend upward from the base, and an open, upper end, and
a coating containing a fluropolymer and a 1106 hexagonal boron nitride, configuration, wherein the coating comprises at least 30 wt. % to not greater than 70 wt. % of the 1106 hexagonal boron nitride dispersed within the fluoropolymer portion, wherein the coating is configured to coat the substrate which forms the base and the perimetrical sidewall of the cartridge case; wherein, via the coating, the cartridge case does not exhibit burn-through during a firing event that has a duration of greater than two milliseconds, wherein the firing event produces a gas having pressure of at least 40 ksi and a temperature not greater than 3000° C.

22. A method, comprising:
forming a cartridge casing from a substrate material to provide a body having at least one sidewall, the cartridge casing having a first end and a second end, wherein the cartridge casing is configured to retain a projectile and a propellant;
coating the cartridge casing with a layer of a fluoropolymer including a hexagonal boron nitride ceramic particulate having a plate-like configuration dispersed therein, wherein the layer comprises at least 30 wt. % to not greater than 70 wt. % of the hexagonal boron nitride ceramic particulate configured to be dispersed within the layer;
drying the layer to remove a solvent from the layer and set the layer onto a surface of the cartridge casin

Assignees

• Alcoa Inc
• Arconic Inc

Inventors

• Skiles Jean Ann
• Warren Charles
• Drieling Heather
• Mcallister John
• Murphy Tom
• Wiswall James

Classifications

• F42B5/295

  coated · CPC title

• F42B33/14 Primary

  Surface treatment of cartridges or cartridge cases {(F42B33/004 takes precedence)} · CPC title