Cold spray nozzles

Patent metadata

Field	Value
Publication number	US-2016130703-A1
Application number	US-201514934976-A
Country	US
Kind code	A1
Filing date	Nov 6, 2015
Priority date	Nov 6, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A nozzle assembly for a cold spray deposition system includes a nozzle body with an axial bore. The axial bore defines a converging segment, a diverging segment downstream of the converging segment, and a throat fluidly connected between the converging and diverging segments of the axial bore. A particulate conduit is fixed within the axial bore and extends along the axial bore diverging segment for issuing solid particulate into the diverging segment of the axial bore.

First claim

What is claimed is:

1 . A nozzle assembly for a cold spray system, comprising:
a nozzle body with an axial bore, the axial bore defining:
a converging segment;
a diverging segment downstream of the converging segment;
a throat fluidly connected between the converging and diverging segments; and
a particulate conduit fixed within the axial bore and extending along the axial bore into the diverging segment for issuing solid particles into the diverging segment of the axial bore.

2 . An assembly as recited in claim 1 , wherein the particulate conduit includes an outlet disposed in the diverging segment.

3 . An assembly as recited in claim 2 , wherein the particulate conduit defines a substantially uniform flow area within both the diverging and converging segments of the axial bore.

4 . An assembly as recited in claim 1 , wherein the nozzle body includes a steel material.

5 . An assembly as recited in claim 1 , further including a motive gas coupling connected to the particulate conduit.

6 . An assembly as recited in claim 5 , wherein the motive gas coupling is a first motive gas coupling, and further including a second motive gas coupling connected to the converging segment of the axial bore.

7 . An assembly as recited in claim 1 , further including an insert seated within the axial bore and fixing the particulate conduit within the axial bore.

8 . An assembly as recited in claim 7 , wherein the insert is seated within the converging segment of the axial bore.

9 . An assembly as recited in claim 7 , wherein the insert includes an annulus and a plurality ligaments, the annulus circumferentially surrounding the particulate conduit and the plurality of ligaments extending radially from the annulus.

10 . An assembly as recited in claim 9 , wherein the plurality of ligaments define circumferentially between one another a plurality of a motive gas flow aperture conforming to the profile of the axial bore.

11 . An assembly as recited in claim 1 , wherein the particulate conduit has an exterior surface bounding a central portion of the axial bore.

12 . An assembly as recited in claim 1 , wherein the particulate conduit includes an exterior surface, wherein at least a portion of the exterior surface disposed within the converging segment includes thermal insulation.

13 . A cold spray system, comprising:
a nozzle assembly including a nozzle body with an axial bore, the axial bore defining:
a converging segment;
a diverging segment downstream of the converging segment;
a throat fluidly connected between the converging and diverging segments; and
a particulate conduit fixed within the axial bore and extending along the axial bore into the diverging segment; and
a first motive gas coupling connected to the particulate conduit for supplying a first motive gas flow with entrained solid particulate to the diverging segment of the axial bore through the particulate conduit, a second motive gas coupling connected to the converging segment of the axial bore for supplying a second motive gas flow to diverging segment separated from the first motive gas flow with entrained solid particulate.

14 . A system as recited in claim 13 , further including a first motive gas source connected to the first motive gas coupling and a second motive gas source connected to the second motive gas coupling, wherein at least one of the first and second gas sources includes a gas selected from a group including nitrogen, helium and argon.

15 . A system as recited in claim 14 , wherein the first motive gas source includes a gas different than a gas included by the second motive gas source.

16 . A system as recited in claim 14 , wherein the first motive gas source and the second motive gas source are a common motive gas source.

17 . A system as recited in claim 13 , wherein the solid particulate includes aluminum, wherein the nozzle body includes a steel or carbide material.

18 . A method of cold spray deposition, the method comprising:
receiving a first motive gas with entrained solid particulate within a particulate conduit fixed within an axial bore of a cold spray nozzle; receiving a second motive gas within a converging segment of the axial bore; directing the first motive gas with entrained solid particulate to a diverging segment of the axial bore through the particulate conduit; directing the second motive gas to the diverging segment of the axial bore separately from the first motive gas with entrained solid particulate; and introducing the first motive gas with entrained solid particulate into the second motive gas in the diverging segment of the axial bore.

19 . A method as recited in claim 18 , further including increasing a velocity of the second motive gas within the diverging segment of the axial bore prior to introducing operation the first motive gas flow and entrained solid particulate into the second motive gas flow.

20 . A method as recited in claim 18 , further including cooling at least a portion of the particulate conduit disposed in the converging segment of the axial bore using the first motive gas.

Assignees

• United Technologies Corp

Inventors

• Nardi Aaron T
• Klecka Michael A
• Chiappetta Louis
• Haas Martin

Classifications

• B05B7/1486 Primary

  for spraying particulate material in dry state · CPC title

• C23C24/04 Primary

  Impact or kinetic deposition of particles · CPC title

• B05B7/1606

  the spraying of the material involving the use of an atomising fluid, e.g. air (B05B7/168, B05B7/1686, B05B7/20, B05B7/22 take precedence) · CPC title

• B05B1/02

  designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, {or having an outlet of particular shape}(B05B1/26, B05B1/28, B05B1/34 take precedence) · CPC title

• C23C4/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title