# US 10,480,330 B2 · Blade rub material

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- Number: US 10,480,330 B2
- Document ID: US10480330B2
- Status: Granted
- Kind: B2
- Application number: 16/407,332
- Filed: 2019-05-09
- Published: 2019-09-05
- Granted: 2019-11-19
- Earliest claimed: 2019-05-09
- Assignees: United Technologies Corporation
- Applicants: United Technologies Corporation
- Inventors: Christopher W. Strock; Changsheng Guo
- Web page: https://patentgrep.com/patent/US10480330B2

## CPC

- F01D 5/28: Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion
- C08K 7/22: Expanded, porous or hollow particles
- C08K 7/28: Glass
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres}
- C09D 183/04: Polysiloxanes
- F01D 11/001: {for sealing space between stator blade and rotor}
- F01D 11/125: {with a reinforcing structure}
- C08G 77/24: halogen-containing groups
- C08L 2205/20: Hollow spheres
- F05D 2220/36: specially adapted for the fan of turbofan engines
- F05D 2240/11: Shroud seal segments
- F05D 2300/437: Silicon polymers
- F05D 2300/61: Syntactic materials, i.e. hollow spheres embedded in a matrix
- Y10T 428/24008: including fastener for attaching to external surface
- Y10T 428/24628: Nonplanar uniform thickness material
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rub material (124) comprises a polymeric matrix (128) and polymeric micro-balloons (130) in the matrix.

## Claims

### Claim 1

A rub material (124) comprising:
a polymeric matrix (128);
polymeric micro-balloons (130) in the matrix; and
polymeric fiber (140) at 5-33% by volume in the matrix.

### Claim 2 (depends on 1)

The material of claim 1 wherein:
the matrix (128) comprises a silicone.

### Claim 3 (depends on 1)

The material of claim 1 wherein:
the rub material is at least 1.0 mm thick.

### Claim 4 (depends on 2)

The material of claim 2 wherein:
the silicone is selected from the group consisting of dimethyl- and fluoro-silicone rubbers and their copolymers.

### Claim 5 (depends on 1)

The material of claim 1 wherein:
the micro-balloons (130) at least locally have a concentration of 5-50% by volume.

### Claim 6 (depends on 5)

The material of claim 5 wherein:
over a depth of at least 1 mm, the micro-balloons (130) have said concentration of 5-50% by volume.

### Claim 7 (depends on 5)

The material of claim 5 wherein:
over a depth of at least 1 mm, the micro-balloons (130) have said concentration of 20-33% by volume.

### Claim 8 (depends on 1)

The material of claim 1 wherein:
the micro-balloons (130) have diameters of 10-80 micrometer.

### Claim 9 (depends on 1)

The material of claim 1 wherein:
the micro-balloons (130) have diameters of 20-45 micrometer.

### Claim 10 (depends on 1)

The material of claim 1 injection molded in situ to a substrate (134) or separately injection molded and bonded to the substrate.

### Claim 11 (depends on 1)

A turbomachine (20) comprising:
a plurality of blades (100), each blade having a tip, the blades mounted for rotation about an axis;
a case (28) surrounding the plurality of blades and having:
a substrate (134); and
a coating of the blade rub material (124) of claim 1 on the substrate facing the blade tips.

### Claim 12 (depends on 11)

The turbomachine of claim 11 wherein:
the blades comprise an aluminum-based substrate (102) and a polyurethane coating (104).

### Claim 13 (depends on 11)

The turbomachine of claim 11 being a gas turbine engine wherein:
the plurality of blades are a fan blade stage.

### Claim 14 (depends on 13)

The turbomachine of claim 13 wherein:
the blades comprise an aluminum alloy or a titanium alloy.

### Claim 15 (depends on 1)

A blade rub segment (160) comprising:
a substrate (134); and
a coating of the rub material (124) of claim 1 on the substrate.

### Claim 16 (depends on 15)

The blade rub segment of claim 15 wherein:
the substrate has a transversely concave first surface (132) and an opposite second surface (172) and a plurality of mounting features (170).

### Claim 17 (depends on 15)

The blade rub segment of claim 15 wherein:
the coating has a transversely concave first surface (126) and an opposite second surface (190) secured to the substrate.

### Claim 18 (depends on 1)

A method for manufacturing the material of claim 1, the method comprising:
dispersing the micro-balloons in uncured polymer for the matrix material by mixing.

### Claim 19 (depends on 18)

The method of claim 18 wherein:
the micro-balloons are first dispersed in a solvent.

### Claim 20 (depends on 18)

The method of claim 18 further comprising:
injection molding of the uncured polymer and dispersed micro-balloons.