Methods of forming a structure, and related tools for additively manufacturing the structure

Patent metadata

Field	Value
Publication number	US-2023191651-A1
Application number	US-202117553581-A
Country	US
Kind code	A1
Filing date	Dec 16, 2021
Priority date	Dec 16, 2021
Publication date	Jun 22, 2023
Grant date	—

Abstract

A method of forming a structure comprising a continuous fiber material comprises continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material and a thermoset resin material, heating or cooling the feed material to maintain a temperature of the feed material to a temperature sufficient to tackify the feed material and at least partially cure the feed material and initiate adhesion of the feed material on a build platform or a previously formed portion of a structure, and moving the continuous fiber nozzle assembly in three dimensions while depositing the feed material on the build platform or the previously formed portion of the structure to form the structure comprising the continuous fiber material extending in three dimensions. Related methods of forming a composite structure, and related tools for additively manufacturing a structure are disclosed.

First claim

What is claimed is:

1 . A method of forming a structure comprising a continuous fiber material, the method comprising:
continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material and a thermoset resin material; heating or cooling the feed material to maintain a temperature of the feed material to a temperature sufficient to tackify the feed material and at least partially cure the feed material and initiate adhesion of the feed material on a build platform or a previously formed portion of a structure; and moving the continuous fiber nozzle assembly in three dimensions while depositing the feed material on the build platform or the previously formed portion of the structure to form the structure comprising the continuous fiber material extending in three dimensions.

2 . The method of claim 1 , wherein continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material and a thermoset resin material comprises extruding a feed material comprising the continuous fiber material disposed within a thermoset resin material selected from the group consisting of a cyanate ester, an epoxy resin, a phenolic resin, a bismaleimide resin, a polyimide resin, and a phthalonitrile resin.

3 . The method of claim 1 , wherein continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material and a thermoset resin material comprises extruding a feed material comprising the continuous fiber material disposed within a thermoset resin material having a glass transition temperature greater than about 175° C. (about 347° F.).

4 . The method of claim 1 , wherein continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material comprises extruding a feed material comprising a continuous carbon fiber material disposed within the thermoset resin material.

5 . The method of claim 1 , wherein moving the continuous fiber nozzle assembly in three dimensions to form a structure comprising the continuous fiber material extending in three dimensions comprises:
forming a three dimensional structure; and moving the nozzle in a Z-direction perpendicular to a build platform of the additive manufacturing tool while depositing the feed material on the three dimensional structure.

6 . The method of claim 1 , wherein continuously feeding, through a continuous fiber nozzle assembly of an additive manufacturing tool, a feed material comprising a continuous fiber material and a thermoset resin material comprises feeding, through the continuous fiber nozzle assembly, a feed material comprising a metal material dispersed throughout the thermoset resin material.

7 . The method of claim 1 , further comprising exposing the structure to one or more thermal curing processes to fully cure the thermoset resin material.

8 . The method of claim 1 , further comprising exposing the structure to a carbonization process to form a char structure.

9 . The method of claim 8 , wherein exposing the structure to a carbonization process comprises increasing a porosity of the structure.

10 . The method of claim 8 , further comprising exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process.

11 . The method of claim 10 , wherein exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process comprises exposing the char structure to a metal infiltration process selected from the group consisting of a chemical vapor infiltration process, a liquid metal infiltration process, and a metal evaporation process.

12 . The method of claim 10 , wherein exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process comprises forming a structure comprising at least one metal carbide dispersed within a carbon network.

13 . The method of claim 8 , wherein moving the continuous fiber nozzle assembly in three dimensions to form a structure comprising the continuous fiber material comprises forming the structure to exhibit a char yield greater than about 80%.

14 . A method of forming a composite structure, the method comprising:
forming a structure using a six-axis additive manufacturing tool, forming the structure comprising:
feeding a feed material comprising a pre-impregnated continuous fiber material dispersed within a thermoset resin material through a continuous fiber nozzle assembly of the additive manufacturing tool to a surface of a structure; and
while feeding the feed material through the continuous fiber nozzle assembly, exposing the feed material to thermal radiation to at least partially cure the feed material;
curing the structure to form a cured structure; and carbonizing the cured structure to form a char structure.

15 . The method of claim 14 , wherein curing the structure to form a cured structure comprises curing the structure to form a polymer matrix composite structure having a glass transition temperature (T g ) greater than about175° C. (about 347° F.).

16 . The method of claim 14 , wherein curing the structure to form a cured structure comprises, while exposing the feed material to the thermal radiation, substantially completely curing the structure.

17 . The method of claim 14 , wherein feeding a feed material comprising a pre-impregnated continuous fiber material dispersed within a thermoset resin material through a continuous fiber nozzle assembly comprises feeding a feed material comprising a thermoset resin material selected from the group consisting of a cyanate ester, an epoxy resin, a phenolic resin, a bismaleimide resin, a polyimide resin, and a phthalonitrile resin.

18 . The method of claim 14 , wherein forming a cured structure comprises forming the cured structure to exhibit a char yield greater than 80%.

19 . The method of claim 14 , wherein carbonizing the cured structure to form a char structure comprises forming the char structure having a lower porosity than the cured structure.

20 . The method of claim 14 , further comprising exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process to form a composite structure.

21 . The method of claim 20 , wherein exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process comprises exposing the char structure to a polymer comprising the same material composition as the thermoset resin material.

22 . The method of claim 21 , further comprising curing the polymer.

23 . The method of claim 20 , wherein exposing the char structure to at least one of a polymer infiltration process or a metal infiltration process to form a composite structure comprises exposing the char structure to a metal infiltration process to form a composite structure comprising a metal carbide.

24 . The method of claim 23 , wherein forming a composite structure comprising a metal carbide comprises forming a composite structure comprising tungsten carbide.

25 . The method of claim 23 , wherein forming a composite structure comprising a metal carbide comprises forming a composite structure comprising silicon carbide

Assignees

• Northrop Grumman Systems Corp

Inventors

• Garcia Benjamin W
• Barnes Eric G

Classifications

• B29K2101/10

  Thermosetting resins · CPC title

• B28B11/04

  for coating {or applying engobing layers}(glazing, engobing C04B) · CPC title

• B28B11/243

  Setting, e.g. drying, dehydrating or firing ceramic articles (B28B11/242 takes precedence) · CPC title

• B33Y40/20

  Post-treatment, e.g. curing, coating or polishing · CPC title

• B29C64/30

  Auxiliary operations or equipment · CPC title