# US 5,702,829 A · Multilayer material, anti-erosion and anti-abrasion coating incorporating said multilayer material

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- Number: US 5,702,829 A
- Document ID: US5702829A
- Status: Granted
- Kind: A
- Application number: 08/634,899
- Filed: 1996-04-26
- Granted: 1997-12-30
- Earliest claimed: 1991-10-14
- Assignees: Commissariat a l'Energie Atomique; Turbomeca; L'Etat Francais represente par le Delegue General pour l'Armement
- Inventors: Serge Paidassi; Jacques Ernoult; Michel Brun; Pierre Monge-Cadet; Yves Pauleau; Guy Farges
- Web page: https://patentgrep.com/patent/US5702829A

## CPC

- C23C 14/06: characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence)
- C23C 14/0021: {Reactive sputtering or evaporation}
- C23C 14/0073: {by exposing the substrates to reactive gases intermittently}
- C23C 14/16: on metallic substrates or on substrates of boron or silicon
- C23C 28/02: only coatings {only including layers} of metallic material
- Y10T 428/12458: having composition, density, or hardness gradient
- Y10T 428/12576: Boride, carbide or nitride component
- Y10T 428/12632: Four or more distinct components with alternate recurrence of each type component
- Y10T 428/1284: W-base component
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a multilayer material useful as an anti-erosion and anti-abrasion coating, and to a process for producing the multilayer material at low temperatures. The multilayer material comprises a substrate covered with at least one metallic tungsten ductile layer and at least one hard layer of a solid solution of an additional element chosen from carbon or nitrogen or a mixture of carbon and nitrogen in tungsten or a tungsten alloy, the two types of layers ar alternating. The multilayer material is particularly useful as a coating for parts used in aeronautics.

## Claims

### Claim 1

A multilayer material, characterized in that it comprises a substrate covered with at least one ductile, metallic tungsten or tungsten alloy layer and at least one hard layer of a solid solution of nitrogen, in tungsten or in a tungsten alloy, the two types of layers alternating.

### Claim 2 (depends on 1)

Multilayer material according to claim 1, characterized in that the nitrogen content in the solid solution is between 0.5 and 15 atomic %.

### Claim 3 (depends on 1)

Multilayer material according to claim 1, characterized in that the nitrogen content in the solid solution is between 1 and 10 atomic %.

### Claim 4 (depends on 1)

Multilayer material according to claim 1, characterized in that it comprises at least two successive hard layers of solid solution having constant nitrogen contents within each hard layer, and two successive hard layers having different nitrogen contents.

### Claim 5 (depends on 1)

Multilayer material according to claim 1, characterized in that it comprises at least two successive hard layers of solid solution having constant nitrogen contents within each hard layer and increasing nitrogen contents within the assembly of successive hard layers.

### Claim 6 (depends on 1)

Multilayer material according to claim 1, characterized in that it comprises at least two successive hard layers of solid solution having constant nitrogen contents within each hard layer and increasing nitrogen contents within the assembly of successive hard layers, and in that the hard layer closest to the substrate has the lowest nitrogen content of all the successive hard layers.

### Claim 7 (depends on 1)

Multilayer material according to claim 1, characterized in that at least one of the hard layers internally has an increasing gradient of nitrogen in the solid solution, the part of the said hard layer having the lowest nitrogen content being directed towards the substrate.

### Claim 8 (depends on 1)

Multilayer material according to claim 1, characterized in that the tungsten alloy used is an alloy constituted by tungsten and one or more other elements selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, nickel, copper, aluminum, cobalt, iron, platinum and palladium.

### Claim 9 (depends on 1)

Multilayer material according to claim 1, characterized in that the substrate is chosen from among a titanium alloy, stainless steel, an aluminum alloy, a nickel alloy, polymers or composite materials.

### Claim 10 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9)

A mechanical part subject to the impact of abrasive particles including an anti-erosion and anti-abrasion coating, characterized in that it comprises a multilayer material according to any one of the claims 1-9.