# US 2021/0276922 A1 · Self-healing matrix for a ceramic composite

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- Number: US 2021/0276922 A1
- Document ID: US20210276922A1
- Status: Published application
- Kind: A1
- Application number: 17/328,213
- Filed: 2021-05-24
- Published: 2021-09-09
- Earliest claimed: 2018-12-19
- Assignees: Rtx Corporation
- Applicants: Raytheon Technologies Corporation
- Inventors: Xia Tang; James T. Beals; Richard Wesley Jackson; Ying She; Andrew J. Lazur; Kathryn S. Read; Mary Colby
- Web page: https://patentgrep.com/patent/US20210276922A1

## CPC

- C04B 35/571: obtained from {Si-containing} polymer precursors {or organosilicon monomers}
- B32B 18/00: Layered products essentially comprising ceramics, e.g. refractory products
- C04B 35/50: based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)}
- C04B 35/563: based on boron carbide
- C04B 35/565: based on silicon carbide
- C04B 35/58064: {based on refractory borides}
- C04B 35/58071: {based on titanium borides}
- C04B 35/58078: {based on zirconium or hafnium borides}
- C04B 35/58085: {based on silicides}
- C04B 35/58092: {based on refractory metal silicides}
- C04B 35/584: based on silicon nitride
- C04B 35/62863: {Silicon carbide}
- C04B 35/80: Fibres, filaments, whiskers, platelets, or the like
- C04B 41/5059: {Silicon carbide}
- C04B 2235/3205: Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3224: Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B 2235/3804: Borides
- C04B 2235/3813: Refractory metal borides
- C04B 2235/3817: Carbides
- C04B 2235/3821: Boron carbides
- C04B 2235/3826: Silicon carbides
- C04B 2235/3856: Carbonitrides, e.g. titanium carbonitride, zirconium carbonitride
- C04B 2235/3891: Silicides, e.g. molybdenum disilicide, iron silicide
- C04B 2235/428: Silicon
- C04B 2235/5244: Silicon carbide
- C04B 2235/5418: expressed by the size of the particles or aggregates thereof
- C04B 2235/614: Gas infiltration of green bodies or pre-forms
- C04B 2235/616: Liquid infiltration of green bodies or pre-forms
- C04B 2235/75: Products with a concentration gradient
- C04B 2237/34: Oxidic
- C04B 2237/343: Alumina or aluminates
- C04B 2237/36: Non-oxidic
- C04B 2237/365: Silicon carbide
- C04B 2237/38: Fiber or whisker reinforced
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A method for forming a self-healing ceramic matrix composite (CMC) component includes depositing a first self-healing particulate material in a first region of a CMC preform of the CMC component and depositing a second self-healing particulate material having a different chemical composition than the first self-healing particulate material in a second region of the CMC preform distinct from the first region.

## Claims

### Claim 1

A ceramic matrix composite (CMC) component comprising:
a plurality of fibers; and
a ceramic matrix, wherein the plurality of fibers are embedded in the ceramic matrix and wherein the ceramic matrix comprises:
a first region comprising deposits of a first self-healing material capable of sealing cracks in the matrix; and
a second region distinct from the first region and comprising deposits of a second self-healing material capable of regenerating an environmental barrier coating;
wherein the deposits of the first and second self-healing materials are dispersed throughout the matrix in each of the first and second regions.

### Claim 2 (depends on 1)

The CMC component of claim 1, wherein the first self-healing material is selected from a group consisting of silicon boride, boron carbide, silicon borocarbide, silicon boronitrocarbide, and mixtures thereof, and wherein the second self-healing material is selected from a group consisting of borides of rare earth elements, hafnium boride, zirconium boride, titanium boride, tantalum boride, silicides of rare earth elements, hafnium silicide, zirconium silicide, titanium silicide, tantalum silicide, molybdenum disilicide, aluminum oxide, alkaline metal oxides, oxide of rare earth elements and mixtures thereof.

### Claim 3 (depends on 1)

The CMC component of claim 1, wherein the first region comprises an inner core of the CMC component and wherein the second region comprises an outer region of the CMC component.

### Claim 4 (depends on 1)

The CMC component of claim 1, wherein the first region is located on a first side of the CMC component and wherein the second region is located on a second side opposite the first side of the CMC component.

### Claim 5 (depends on 1)

The CMC component of claim 1, wherein the deposits of the first and second self-healing materials make up 0.5 to 25 percent of the matrix by volume.

### Claim 6 (depends on 1)

The CMC component of claim 1, wherein the ceramic matrix further comprises a third region comprising deposits of the first self-healing material and deposits of the second self-healing material.

### Claim 7 (depends on 6)

The CMC component of claim 6, wherein the third region is located between the first and second regions.

### Claim 8 (depends on 1)

The CMC component of claim 1, wherein individual deposits of the second self-healing material are greater in size than individual deposits of the first self-healing material.

### Claim 9 (depends on 1)

The CMC component of claim 1, wherein the first self-healing material forms a boron oxide when exposed to oxidative gases entering the matrix.

### Claim 10 (depends on 1)

The CMC component of claim 1, wherein oxides of the second self-healing material react with silica to form metal silicates.

### Claim 11 (depends on 1)

The CMC component of claim 1, wherein the second region has a depth from an external surface of the CMC component less than or equal to approximately 1 millimeter.

### Claim 12 (depends on 1)

The CMC component of claim 1, wherein the ceramic matrix comprises silicon carbide.

### Claim 13 (depends on 1)

The CMC component of claim 1, wherein the plurality of fibers are coated with boron nitride.

### Claim 14

An undensified fiber preform for a CMC component, the undensified fiber preform comprising:
a plurality of fibers;
deposits of a first self-healing material in a first region of the undensified fiber preform; and
deposits of a second self-healing material in a second region of the undensified fiber preform;
wherein the first and second self-healing materials are different.

### Claim 15 (depends on 14)

The undensified fiber preform of claim 14, wherein the first self-healing material is selected from a group consisting of silicon boride, boron carbide, silicon borocarbide, silicon boronitrocarbide, and mixtures thereof, and wherein the second self-healing material is selected from a group consisting of borides of rare earth elements, hafnium boride, zirconium boride, titanium boride, tantalum boride, silicides of rare earth elements, hafnium silicide, zirconium silicide, titanium silicide, tantalum silicide, molybdenum disilicide, aluminum oxide, alkaline metal oxides, oxide of rare earth elements and mixtures thereof.

### Claim 16 (depends on 14)

The undensified fiber preform of claim 14, wherein the first region forms an inner core of the CMC component and wherein the second region forms an outer region of the CMC component.

### Claim 17 (depends on 14)

The undensified fiber preform of claim 14, wherein the first region is located on a first side of the CMC component and wherein the second region is located on a second side opposite the first side of the CMC component.

### Claim 18 (depends on 14)

The undensified fiber preform of claim 14, and further comprising deposits of the first and second self-heling materials in a third region, wherein the third region is located between the first and second regions.

### Claim 19 (depends on 14)

The undensified fiber preform of claim 14, wherein a particle size of the first self-healing material is less than a particle size of the second self-healing material.

### Claim 20 (depends on 14)

The undensified fiber preform of claim 14, and further comprising deposits of silicon carbide particles.