# US 11,897,051 B2 · Transient liquid phase bonding of surface coatings and metal-covered materials

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- Number: US 11,897,051 B2
- Document ID: US11897051B2
- Status: Granted
- Kind: B2
- Application number: 17/185,372
- Filed: 2021-02-25
- Published: 2021-06-17
- Granted: 2024-02-13
- Earliest claimed: 2013-07-09
- Assignees: Rtx Corporation
- Applicants: RTX Corporation
- Inventors: Grant O. Cook, III
- Web page: https://patentgrep.com/patent/US11897051B2

## CPC

- B23K 20/16: with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
- B23K 20/02: by means of a press {; Diffusion bonding}
- B23K 20/233: without ferrous layer
- B23K 35/3612: {with organic compounds as principal constituents}
- B23K 35/3613: {Polymers, e.g. resins}
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- C23C 28/021: {including at least one metal alloy layer}
- C23C 28/023: {only coatings of metal elements only}
- C23C 28/028: {Including graded layers in composition or in physical properties, e.g. density, porosity, grain size}
- B23K 2101/001: {Turbines}
- B23K 2101/34: Coated articles {; Surface treated articles}
- B23K 2103/16: Composite materials
- B23K 2103/172: {wherein at least one of the layers is non-metallic}
- B23K 2103/18: Dissimilar materials
- B23K 2103/26: {Alloys of Nickel and Cobalt and Chromium}
- B23K 2103/42: {Plastics other than composite materials}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)

## Abstract

A method for bonding components is disclosed. The method may comprise positioning an interlayer between a metallic component and a metal-plated non-metallic component at a bond region, heating the bond region to a bonding temperature to produce a liquid at the bond region, and maintaining the bond region at the bonding temperature until the liquid has solidified to form a bond between the metallic component and the metal-plated non-metallic component at the bond region. A method for providing a part having a customized coating is also disclosed. The method may comprise applying a metallic coating on a surface of a metallic substrate, and bonding the metallic coating to the metallic substrate by a transient liquid phase bonding process to provide the part having the customized coating.

## Claims

### Claim 1

A method for providing a part having a customized coating, comprising:
applying at least one metallic coating on a surface of a metallic substrate to provide a coated substrate; and
bonding the at least one metallic coating to the metallic substrate by a transient liquid phase bonding process to provide the part having the customized coating,
wherein the transient liquid phase bonding process comprises progressively heating the coated substrate to a bonding temperature,
wherein progressively heating the coated substrate to the bonding temperature comprises 1) heating the coated substrate to a first temperature that is lower than the bonding temperature to cause at least a portion of the at least one metallic coating to form at least one liquid interlayer, 2) heating the coated substrate past the first temperature to cause the at least one liquid interlayer to expand in thickness and dissolve a portion of a material forming the metallic substrate, and 3) heating the coated substrate to the bonding temperature to cause the at least one liquid interlayer to undergo an isothermal solidification process,
wherein heating the coated substrate to the first temperature causes a portion of the at least one metallic coating to melt by eutectic melting, and wherein the liquid interlayer is formed between the metallic substrate and an un-melted portion of the at least one metallic coating.

### Claim 2 (depends on 1)

A method of claim 1, wherein the customized coating has a set of properties different than those of the metallic substrate and the at least one metallic coating.

### Claim 3 (depends on 1)

The method of claim 1, wherein a bond between the customized coating and the metallic substrate has a melting temperature that exceeds the bonding temperature.

### Claim 4 (depends on 3)

The method of claim 3, wherein heating the coated substrate to the first temperature causes the at least one metallic coating to melt by direct melting.

### Claim 5 (depends on 3)

The method of claim 3, further comprising continuing heating the part past the bonding temperature to increase the portion of the material forming the metallic substrate in the customized coating.

### Claim 6 (depends on 1)

The method of claim 1, wherein the at least one metallic coating has a thickness of 1 micron to 500 microns.