# US 2018/0021793 A1 · Directional cold spray method

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- Number: US 2018/0021793 A1
- Document ID: US20180021793A1
- Status: Published application
- Kind: A1
- Application number: 15/720,465
- Filed: 2017-09-29
- Published: 2018-01-25
- Earliest claimed: 2015-06-23
- Assignees: Moog Inc.
- Applicants: Moog Inc.
- Inventors: Benjamin HOILAND; Jarrod SCHELL; Christopher HOWE
- Web page: https://patentgrep.com/patent/US20180021793A1

## CPC

- B05B 7/1486: {for spraying particulate material in dry state}
- C23C 24/04: Impact or kinetic deposition of particles
- B05B 13/06: specially designed for treating the inside of hollow bodies (spray heads B05B1/00 - B05B7/00; {devices for covering leaks in pipes or hoses, e.g. hose-menders, from inside the pipe F16L55/162; sprayed layers of rubber or plastics for internal protection of pipes or pipe fittings against corrosion or incrustation F16L58/1027})
- B33Y 80/00: Products made by additive manufacturing
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

A directional cold spray nozzle defines a flow passageway that includes a bend for redirecting flow from a first flow direction to a second flow direction different from the first flow direction, wherein the flow passageway is divergent through at least a portion of the bend. The flow passageway may be convergent prior to becoming divergent in the path of flow. The directional cold spray nozzle simultaneously accelerates the powder and carrier gas and changes the spray direction of the spray plume to reach interior bore surfaces and other surfaces that are difficult or impossible to reach with a straight nozzle.

## Claims

### Claim at position 1

-13. (canceled)

### Claim 14

A cold spray method of applying material to a workpiece, the method comprising the steps of:
accelerating a flow of powder and a carrier gas through a nozzle;
changing a direction of the flow as the carrier gas and the powder travel through the nozzle without introducing additional gas streams to the nozzle; and
discharging the flow from an exit end of the nozzle to a surface of the workpiece such that the powder adheres to the surface of the workpiece through solid state bonding;
wherein the steps of accelerating the flow and changing the direction of the flow occur simultaneously; and
wherein the surface of the workpiece is an interior surface of a hole having a diameter which is less than three inches.

### Claim 15 (depends on 14)

The method according to claim 14, wherein the carrier gas is delivered to an entry end of the nozzle and the powder is injected into the nozzle through at least one injection port.

### Claim 16 (depends on 14)

The method according to claim 14, wherein a mixture of the carrier gas and the powder is delivered to an entry end of the nozzle.