Methods and apparatus for additively manufacturing a structure with in-situ reinforcement

Patent metadata

Field	Value
Publication number	US-10926460-B2
Application number	US-201816146389-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Sep 28, 2018
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A method of additive manufacturing is provided. The method includes depositing a layer of base material from which an additively manufactured part is produced. The method also includes depositing a slurry onto the layer of base material, where the slurry includes a solvent, particles of a structural material, and a reinforcing agent.

First claim

What is claimed is:

1. A method of additive manufacturing, the method comprising:
depositing a layer of base material from which an additively manufactured part is produced; and
depositing a slurry onto the layer of base material, wherein the slurry forms a distinct sheet that is disposed on and planarizes a surface of the base material, where the slurry includes a solvent, particles of a structural material, and a reinforcing agent.

2. The method of claim 1 , wherein the particles of the structural material include one or more of particles of the base material, metallic particles having a composition different than the base material, ceramic particles, and polymeric particles having a composition different than the base material.

3. The method of claim 1 , further comprising depositing another layer of base material on top of the layer of base material upon which the slurry has been applied.

4. The method of claim 3 , wherein the distinct sheet formed by the slurry is an interstitial sheet that is disposed between and couples adjacent layers of base material to each other where the interstitial sheet at least partially fills one or more of voids and pores of each of the layer of base material and the other layer of base material with the slurry.

5. The method of claim 1 , wherein depositing the layer of base material includes depositing a plurality of filaments of base material in a side-by-side arrangement so as to form the layer of base material, where
the layer of base material includes one or more of voids and pores, and
depositing the slurry onto the layer of base material at least partially fills the one or more of voids and pores.

6. The method of claim 1 , wherein depositing the layer of base material includes depositing a powdered base material so as to form the layer of base material, where
the layer of base material includes one or more of voids and pores, and
depositing the slurry onto the layer of base material at least partially fills the one or more of voids and pores.

7. The method of claim 1 , wherein depositing the slurry onto the layer of base material includes spraying, with a deposition device, the slurry onto the layer of base material, where the deposition device is movable.

8. The method of claim 1 , wherein depositing the slurry onto the layer of base material includes spraying, with a deposition device that is fixed relative to the base material, the slurry onto the layer of base material.

9. The method of claim 1 , further comprising modifying, with the slurry, one or more of a thermal conductivity, an electrical conductivity, and a permeability of the additively manufactured part formed by the base material.

10. An additively manufactured part comprising:
at least one layer of base material; and
a reinforcing agent disposed on the at least one layer of base material, where the reinforcing agent is deposited upon the at least one layer as a slurry that forms a distinct sheet disposed between adjacent layers of the at least one layer of base material and at least partially fills one or more of voids and pores in each of the adjacent layers of the at least one layer of base material, wherein the distinct sheet of slurry includes a solvent, particles of a structural material, and the reinforcing agent.

11. The additively manufactured part of claim 10 , wherein the particles of the structural material include one or more of particles of the base material, metallic particles having a composition different than the base material, and polymeric particles having a composition different than the base material.

12. The additively manufactured part of claim 10 , wherein the reinforcing agent is interstitially disposed between the adjacent layers of base material, at least partially filling the one or more of voids and pores, so as to reinforce coupling of the adjacent layers of base material.

13. The additively manufactured part of claim 10 , wherein the at least one layer of base material includes a polymeric material so that the layer of base material includes a polymer.

14. The additively manufactured part of claim 10 , wherein the at least one layer of base material includes a metal so that the layer of base material includes metallic particles.

15. The additively manufactured part of claim 10 , wherein the reinforcing agent includes one or more of nanoparticles, two-dimensional organic or inorganic nano-sheets, carbon nanotubes, nano-platelets, and graphene.

16. An additive manufacturing apparatus comprising:
a frame;
a base material support bed coupled to the frame;
a base material deposition unit movably coupled to the frame and being disposed above the base material support bed, the base material deposition unit being configured to deposit one or more layers of base material upon the base material support bed; and
a deposition device coupled to the frame so as to be positioned relative to the frame and comprising a spray nozzle configured to deposit a slurry upon the one or more layers of base material, in situ with the deposition of the one or more layers of base material, where the slurry is configured to form a distinct interstitial layer between adjacent layers of base material where the interstitial layer has a thickness that fills one or more of voids and pores of the adjacent layers.

17. The additive manufacturing apparatus of claim 16 , wherein the frame forms a chamber that encloses at least the spray nozzle of the deposition device.

18. The additive manufacturing apparatus of claim 16 , further comprising a controller configured to control positioning movement of one or more of the base material deposition unit and the deposition device.

19. The additive manufacturing apparatus of claim 16 , wherein the spray nozzle is fixed relative to the base material support bed.

20. The additive manufacturing apparatus of claim 16 , further comprising a heater configured to heat the slurry deposited upon the layer of base material so as to reduce an amount of solvent in the slurry.

Assignees

• Boeing Co

Inventors

• Prakash Om
• Sahu Megha

Classifications

• B22F12/10

  Auxiliary heating means · CPC title

• B22F10/50

  Treatment of workpieces or articles during build-up, e.g. treatments applied to fused layers during build-up · CPC title

• B22F10/38

  to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures · CPC title

• B22F10/25

  Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title