Laminates of polysilazane and carbon fiber reinforced polymer

Patent metadata

Field	Value
Publication number	US-11713732-B2
Application number	US-202217745492-A
Country	US
Kind code	B2
Filing date	May 16, 2022
Priority date	Oct 25, 2018
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

Disclosed are laminates comprising a carbon fiber reinforced polymer sheet and a layer of polysilazane and methods for producing such laminates.

First claim

What is claimed is:

1. A method for inhibiting oxidation of a metal structure electrically connected to a sheet of carbon fiber reinforced polymer (CFRP), wherein the sheet of CFRP has a first side and a second side and the second side is in electrical communication with the metal structure, the method comprising applying a liquid polysilazane composition to at least the first side of the sheet of CFRP and allowing the composition to cure.

2. The method according to claim 1 , wherein the liquid polysilazane composition comprises an inorganic polysilazane, an organic polysilazane, or a mixture thereof.

3. The method according to claim 1 , wherein the liquid polysilazane composition comprises a solution of a polysilazane and a solvent inert to the polysilazane.

4. The method according to claim 3 , wherein the solvent is selected from hydrocarbons, C 1 -C 6 alkyl esters of C 2 -C 6 carboxylic acids, and mixtures thereof.

5. The method according to claim 4 , wherein the polysilazane is present in the liquid polysilazane composition at a concentration of about 10-50% by weight of the composition.

6. The method according to claim 5 , wherein the liquid polysilazane is applied to the first side at a thickness that produces, upon cure of the polysilazane, a layer of polysilazane having a thickness of from about 1-10 μm.

7. The method according to claim 6 , wherein the liquid polysilazane is applied to the first side at a rate of about 5-15 mL/m 2 .

8. The method according to claim 4 , wherein the polysilazane is present in the liquid polysilazane composition at a concentration of about 10-20% by weight of the composition.

9. The method according to claim 3 , wherein the first side or the second side of the sheet of CFRP contains perforations.

10. The method according to claim 9 , wherein the perforations have a diameter of from about 0.75 (0.03 in) to about 1.5 mm (0.06 in).

11. The method according to claim 10 , wherein the sidewalls of the perforations are coated with polysilazane.

12. The method according to claim 11 , wherein the perforations cover from about 5-20% of the first side of the sheet.

13. The method according to claim 12 , wherein the metal structure is a metal cellular core or a metal alloy cellular core.

14. The method according to claim 1 , wherein the metal structure is a metal cellular core or a metal alloy cellular core.

15. The method according to claim 14 , wherein the metal cellular core or metal alloy cellular core comprises aluminum.

16. The method according to claim 1 , wherein the first side or the second side of the sheet of CFRP contains perforations.

17. The method according to claim 16 , wherein the perforations have a diameter of from about 0.75 (0.03 in) to about 1.5 mm (0.06 in).

18. The method according to claim 17 , wherein the sidewalls of the perforations are coated with polysilazane.

19. The method according to claim 18 , wherein the perforations cover from about 5-20% of the first side of the sheet.

20. The method according to claim 1 , wherein the sheet of CFRP comprises exposed carbon fibers.

Assignees

• Boeing Co

Inventors

• Kinlen Patrick J
• Grove Randy J

Classifications

• F02K1/827 Primary

  Sound absorbing structures or liners · CPC title

• B32B3/12 Primary

  characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure · CPC title

• B32B3/266

  characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12 · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B15/08

  of synthetic resin · CPC title