# US 11,028,018 B2 · Erosion-resistant ceramic material, powder, slip and component

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- Number: US 11,028,018 B2
- Document ID: US11028018B2
- Status: Granted
- Kind: B2
- Application number: 16/466,070
- Filed: 2017-11-09
- Published: 2020-02-27
- Granted: 2021-06-08
- Earliest claimed: 2016-12-08
- Assignees: Siemens Energy Global GmbH & Co. KG
- Applicants: Siemens Aktiengesellschaft
- Inventors: Ivo Krausz; Friederike Lange; Christian Nikasch
- Web page: https://patentgrep.com/patent/US11028018B2

## CPC

- C04B 35/117: Composites
- C04B 35/66: Monolithic refractories or refractory mortars, including those whether or not containing clay {(making or repairing of linings F27D1/16)}
- C04B 35/10: based on aluminium oxide
- C04B 35/1015: {containing refractory metal compounds other than those covered by C04B35/103 - C04B35/106}
- C04B 35/443: Magnesium aluminate spinel
- C04B 35/62665: {Flame, plasma or melting treatment}
- C04B 35/653: Processes involving a melting step
- C04B 2235/3206: Magnesium oxides or oxide-forming salts thereof
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/322: Transition aluminas, e.g. delta or gamma aluminas
- C04B 2235/3222: Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
- C04B 2235/5284: Hollow fibers, e.g. nanotubes
- C04B 2235/5427: millimeter or submillimeter sized, i.e. larger than 0,1 mm
- C04B 2235/6027: Slip casting
- C04B 2235/763: Spinel structure AB2O4
- C04B 2235/9669: Resistance against chemicals, e.g. against molten glass or molten salts
- F01D 5/288: {Protective coatings for blades}
- F05D 2300/125: Magnesium
- F05D 2300/2112: Aluminium oxides
- 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
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

The use of magnesium oxide, reactive alumina and aluminium oxide as a base provides for a new erosion-resistant material upon sintering.

## Claims

### Claim 1

A powder comprising (in % by weight):
aluminum oxide in an amount of from 92.0% to <99.0%; and
spinel in a proportion of 8.0%-1.0%.

### Claim 2 (depends on 1)

The powder as claimed in claim 1, which contains γ′-aluminum oxide.

### Claim 3 (depends on 1)

The powder as claimed in claim 1, which contains α-alumina as aluminum oxide.

### Claim 4 (depends on 1)

The powder as claimed in claim 1, which contains tabular aluminas as aluminum oxide.

### Claim 5 (depends on 1)

The powder as claimed in claim 1, which contains reactive alumina as aluminum oxide as an additive for reducing a water content and for improving a processability in a ceramic slip, in a proportion of from 10% by weight to 25% by weight.

### Claim 6 (depends on 4)

The powder as claimed in claim 4, wherein the tabular alumina has at least three different particle size fractions.

### Claim 7 (depends on 5)

The powder as claimed in claim 5, wherein the reactive alumina has at least two different particle size fractions.

### Claim 8 (depends on 4)

The powder as claimed in claim 4, wherein the tabular aluminas have a maximum particle size of up to 10 mm.

### Claim 9 (depends on 1)

The powder as claimed in claim 1, which comprises no silicon oxide and/or no silicon compounds.

### Claim 10 (depends on 1)

A slip comprising at least a liquid and a powder as claimed in claim 1.