# US 2019/0170066 A1 · High temperature articles for turbine engines

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- Number: US 2019/0170066 A1
- Document ID: US20190170066A1
- Status: Published application
- Kind: A1
- Application number: 15/831,415
- Filed: 2017-12-05
- Published: 2019-06-06
- Earliest claimed: 2017-12-05
- Assignees: General Electric Company
- Applicants: General Electric Company
- Inventors: Daniel Qi Tan; Shekhar Shripad Kamat; Wei Zhang; Javier Guzman Padilla; Santiago Blackaller Ledesma
- Web page: https://patentgrep.com/patent/US20190170066A1

## CPC

- F02C 7/266: Electric (sparking plugs H01T)
- C22C 21/00: Alloys based on aluminium
- C22C 38/18: containing chromium
- H01T 13/38: Selection of materials for insulation
- H01T 13/39: Selection of materials for electrodes
- F05D 2220/32: in gas turbines
- F05D 2230/90: Coating; Surface treatment
- F05D 2240/35: Combustors or associated equipment
- F05D 2300/17: Alloys
- F05D 2300/175: Superalloys
- F05D 2300/2112: Aluminium oxides
- F05D 2300/611: Coating
- H01T 13/52: characterised by a discharge along a surface
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A high temperature article, for example an igniter for a combustor is presented. The igniter includes a central electrode having a discharge end, an insulator sleeve surrounding the central electrode and a tubular electrode shell surrounding the insulator sleeve. The tubular electrode shell has a forward end projecting beyond the discharge end. The tubular electrode shell includes an iron-based alloy. The igniter further includes a protective coating including alumina disposed on a surface of the forward end. A combustor of a turbine engine, including the igniter is also presented.

## Claims

### Claim 1

An article comprising:
a base body comprising an iron-based alloy; and
a protective coating disposed on a surface of the base body, wherein the protective coating comprises alumina and wherein the protective coating is in contact with the surface of the base body.

### Claim 2 (depends on 1)

The article of claim 1, wherein the iron-based alloy comprises chromium, aluminum, or a combination thereof.

### Claim 3 (depends on 2)

The article of claim 2, wherein the iron-based alloy comprises:
chromium in an amount from about 15% by weight to about 27% by weight, and
aluminum in an amount from about 4% by weight to about 10% by weight.

### Claim 4

An igniter, comprising:
a central electrode having a discharge end;
an insulator sleeve surrounding the central electrode;
a tubular electrode shell surrounding the insulator sleeve and having a forward end projecting beyond the discharge end, wherein the tubular electrode shell comprises an iron-based alloy; and
a protective coating comprising alumina disposed on a surface of the forward end.

### Claim 5 (depends on 4)

The igniter of claim 4, wherein the iron-based alloy comprises chromium, aluminum, or a combination thereof.

### Claim 6 (depends on 5)

The igniter of claim 5, wherein the iron-based alloy comprises:
chromium in an amount from about 15% by weight to about 27% by weight, and
aluminum in an amount from about 4% by weight to about 10% by weight.

### Claim 7 (depends on 4)

The igniter of claim 4, wherein the protective coating is in contact with the surface of the forward end.

### Claim 8 (depends on 4)

The igniter of claim 4, wherein the forward end projects less than 10 millimeters beyond the discharge end.

### Claim 9 (depends on 4)

The igniter of claim 4, wherein the forward end further comprises iridium.

### Claim 10 (depends on 4)

The igniter of claim 4, wherein the central electrode comprises a nickel-based alloy, an iron-based alloy, a cobalt-based alloy, or a combination thereof.

### Claim 11 (depends on 4)

The igniter of claim 4, further comprising a wear-resistant coating disposed on an outer surface of the tubular electrode shell.

### Claim 12 (depends on 11)

The igniter of claim 11, wherein the wear-resistant coating comprises alumina, chromium carbide, or a combination thereof.

### Claim 13 (depends on 4)

The igniter of claim 4, wherein the insulator sleeve comprises an electrical insulating material selected from the group consisting of alumina, beryllium oxide, silicon nitride or a combination thereof.

### Claim 14 (depends on 4)

A combustor of a turbine engine, comprising the igniter of claim 4.