# US 7,607,213 B2 · Method of making a device for measuring deformation

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- Number: US 7,607,213 B2
- Document ID: US7607213B2
- Status: Granted
- Kind: B2
- Application number: 12/109,042
- Filed: 2008-04-24
- Published: 2008-10-30
- Granted: 2009-10-27
- Earliest claimed: 2007-04-30
- Assignees: Snecma
- Inventors: Pierre Bertrand; Christian Coddet; Sophie Costil; Frederic Leman; Sebastien Lukat
- Web page: https://patentgrep.com/patent/US7607213B2

## CPC

- C04B 41/52: Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation}
- C04B 41/009: {characterised by the material treated}
- C04B 41/89: for obtaining at least two superposed coatings having different compositions
- C23C 4/01: Selective coating, e.g. pattern coating, without pre-treatment of the material to be coated
- C23C 4/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- G01B 7/18: {using change in resistance}
- G01N 27/041: {of a solid body}
- C04B 2111/00982: {as construction elements for space vehicles or aeroplanes}
- Y10S 438/96: Porous semiconductor
- Y10T 29/42: Piezoelectric device making
- Y10T 29/49002: Electrical device making
- Y10T 29/49004: including measuring or testing of device or component part
- Y10T 29/49007: Indicating transducer
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of making a device for measuring deformation includes a step of depositing a silicon adhesion underlayer on a silicon carbide surface by chemical vapor spraying, and a step of depositing a coating on the silicon adhesion underlayer by atmospheric thermal spraying.

## Claims

### Claim 1

A method of making a device for measuring deformation, the method comprising the following steps:
a) depositing, on a silicon carbide surface of a part constituted by a substrate covered in a silicon carbide layer deposited by chemical vapor deposition, a silicon adhesion underlayer by vacuum plasma spraying;
b) depositing on said silicon adhesion underlayer an alumina coating by atmospheric thermal spraying;
c) placing a free filament strain gauge on said coating, the gauge being held on a support, and said support possessing openings;
d) depositing a second alumina coating on said strain gauge and on said coating by atmospheric thermal spraying through said openings;
e) removing said support; and
f) depositing a third alumina coating by atmospheric thermal spraying on said first coating, on said second coating, and on said strain gauge.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the adhesion underlayer has a thickness of 50 μm to 70 μm.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the atmospheric thermal spraying is selected between plasma spraying and flame spraying.

### Claim 4 (depends on 1)

The method according to claim 1, wherein said substrate is selected between a composite material having a silicon carbide matrix and a composite material having a self-healing ceramic matrix.