# US 10,309,230 B2 · Co-formed element with low conductivity layer

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- Number: US 10,309,230 B2
- Document ID: US10309230B2
- Status: Granted
- Kind: B2
- Application number: 14/773,945
- Filed: 2013-12-30
- Published: 2016-01-21
- Granted: 2019-06-04
- Earliest claimed: 2013-03-14
- Assignees: United Technologies Corporation
- Applicants: United Technologies Corporation
- Inventors: Michael G McCaffrey
- Web page: https://patentgrep.com/patent/US10309230B2

## CPC

- F01D 5/282: {Selecting composite materials, e.g. blades with reinforcing filaments}
- B28B 1/24: by injection moulding {(injection moulding of ceramic slips B28B1/265; of tubular articles B28B21/38)}
- F01D 5/147: {Construction, i.e. structural features, e.g. of weight-saving hollow blades (F01D5/148, F01D5/16 and F01D5/20 take precedence; blade shape F01D5/141; blades with cooling or heating channels or cavities F01D5/18; heating, heat-insulating or cooling means on blades F01D5/18)}
- F01D 5/225: {by shrouding}
- F01D 5/28: Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion
- F01D 5/284: {Selection of ceramic materials}
- F01D 5/3007: {of axial insertion type}
- F01D 5/3092: {Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers (F01D5/288 takes precedence)}
- F01D 9/041: {using blades (F01D5/148 takes precedence)}
- F05D 2220/32: in gas turbines
- F05D 2230/30: with deposition of material
- F05D 2230/51: in a modular way, e.g. using several identical or complementary parts or features
- F05D 2260/231: Preventing heat transfer
- F05D 2300/2261: of silicon
- F05D 2300/2283: of silicon
- F05D 2300/6033: Ceramic matrix composites [CMC]
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A co-formed element includes a core structure which has a root portion and is formed from a high thermal conductivity ceramic matrix composite material, and a low thermal conductivity layer co-formed with the core structure and surrounding the root portion of the core structure.

## Claims

### Claim 1

A process for forming a co-formed element comprising the steps of:
placing a core structure formed from a fully densified, high thermal conductivity ceramic matrix material having a residual porosity less than 10% into a mold;
placing a three dimensional woven material into said mold so that said three dimensional woven material surrounds a root portion of said core structure;
injecting a matrix material into said mold so that said three dimensional woven material is infiltrated with said matrix material; and
allowing said matrix material to solidify to form said co-formed element.

### Claim 2 (depends on 1)

The process of claim 1, wherein said residual porosity is less than 5.0%.

### Claim 3 (depends on 1)

The process of claim 1, wherein said injecting step comprises injecting a matrix material selected from the group consisting of a silicon nitride material, at least one glassy material, a silicon-nitrogen-carbon material, and combinations thereof in a silicon carbide matrix.

### Claim 4 (depends on 1)

The process of claim 1, further comprising forming said core structure from silicon carbide fiber in a silicon carbide matrix material.

### Claim 5 (depends on 1)

The process of claim 1, further comprising forming said three dimensional woven material from silicon carbide fibers.