LASER METAL DEPOSITION METHODOLOGY ON GRAPHITE SUBSTRATES FOR AEROSPACE COMPONENTS

• US 20200087769A1
• Filed: 10/30/2018
• Published: 03/19/2020
• Est. Priority Date: 09/13/2018
• Status: Active Grant

• Current Assignee: Rosemount Aerospace, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rosemount Aerospace, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Jacob, Robin, Mahapatra, Guru Prasad
• Granted Patent: US 10,640,860 B2
• Time in Patent Office: Days
• CPC Class Codes: B23K 2103/26 Alloys of Nickel and Cobalt and Chromium
• CPC Class Codes: B23K 2103/50 Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
• CPC Class Codes: B23K 26/0006 taking account of the properties of the material involved B23K26/32, B23K26/40 take precedence
• CPC Class Codes: B23K 26/08 Devices involving relative movement between laser beam and workpiece
• CPC Class Codes: B23K 26/1224 in vacuum
• CPC Class Codes: B23K 26/127 in an enclosure
• CPC Class Codes: B23K 26/14 using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor B23K26/12 takes precedence
• CPC Class Codes: B23K 26/144 the fluid stream containing particles, e.g. powder
• CPC Class Codes: B23K 26/1476 Features inside the nozzle for feeding the fluid stream through the nozzle
• CPC Class Codes: B23K 26/32 taking account of the properties of the material involved
• CPC Class Codes: B23K 26/34 Laser welding for purposes other than joining
• CPC Class Codes: B23K 35/004 at least one of the workpieces being of a metal of the iron group
• CPC Class Codes: B23P 15/00 Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
• CPC Class Codes: B33Y 10/00 Processes of additive manufacturing
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor
• CPC Class Codes: C23C 2/04 characterised by the coating material
• CPC Class Codes: C23C 24/10 with intermediate formation of a liquid phase in the layer

Abstract

A laser direct metal deposition method for a graphite substrate is provided. The laser direct metal deposition method includes creating an assembling by sliding an outer sheath over the graphite substrate. Further, laser direct metal deposition method includes performing a laser scanning of the outer sheath and performing a laser metal deposition over the graphite substrate with the outer sheath.

Claims

1. A laser direct metal deposition method for a graphite substrate, the laser direct metal deposition method comprising:

creating an assembling by sliding an outer sheath over the graphite substrate;

performing a laser scanning of the outer sheath; and

performing a laser metal deposition over the graphite substrate with the outer sheath.

2. The laser direct metal deposition method of claim 1, wherein the graphite substrate is prepared without metal plating.

3. The laser direct metal deposition method of claim 1, wherein the graphite substrate is prepared by plating with one or more metals including Nickel or Chromium to prevent oxidation.

4. The laser direct metal deposition method of claim 1, wherein the outer sheath acts as interface for a laser metal deposition molten pool.

5. The laser direct metal deposition method of claim 1, wherein the outer sheath comprises a metallic interface metal.

6. The laser direct metal deposition method of claim 1, wherein a thickness of the outer sheath is determined based on a thickness of a melt pool.

7. The laser direct metal deposition method of claim 1, wherein the outer sheath is mechanically restrained in place over the graphite substrate during the laser direct metal deposition method enable full contact between the outer sheath and the graphite substrate.

8. The laser direct metal deposition method of claim 1, wherein the graphite substrate comprises a rectangular box shape or a cylindrical shape.

9. The laser direct metal deposition method of claim 1, wherein the laser scanning of outer sheath is performed on a surface of the outer sheath with a pre-defined laser power to melt the surface and form a bond with the graphite substrate.

10. The laser direct metal deposition method of claim 1, wherein the laser scanning enables entrapped air between the surface of the outer sheath and the graphite substrate to escape.

11-20. -20. (canceled)