Erosion-resistant ceramic material, powder, slip and component

Patent metadata

Field	Value
Publication number	US-11834377-B2
Application number	US-202017110559-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Dec 8, 2016
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

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

First claim

The invention claimed is:

1. A powder comprising (in % by weight):
from 96.0% to 99.9% of aluminum oxide; and
reactive magnesium oxide in an amount of from 0.1% to 4.0%, to form spinel with the aluminum oxide present, the reactive magnesium functioning as a temporary binder phase;
wherein aluminum oxide is present as tabular alumina.

2. The powder as claimed in claim 1 , wherein the reactive magnesium oxide has a citric acid activity of from 10 seconds to 250 seconds.

3. The powder as claimed in claim 1 , wherein the tabular alumina has at least three different particle size fractions.

4. The powder as claimed in claim 1 , wherein the tabular alumina has a maximum particle size of up to 10 mm.

5. The powder as claimed in claim 1 , wherein no silicon oxide is present in the powder.

6. The powder as claimed in claim 1 , wherein no silicon compounds are present in the powder.

7. A powder comprising (in % by weight):
from 96.0% to 99.9% of aluminum oxide; and
reactive magnesium oxide in an amount of from 0.1% to 4.0%, to form spinel with the aluminum oxide present, the reactive magnesium functioning as a temporary binder phase;
wherein aluminum oxide is present as reactive alumina to reduce a water content, and the reactive alumina is used in a proportion from 10% by weight to 25% by weight in a total mix.

8. The powder as claimed in claim 7 , wherein the reactive alumina has at least two different particle size fractions.

9. The powder as claimed in claim 7 , wherein no silicon oxide is present in the powder.

10. The powder as claimed in claim 7 , wherein no silicon compounds are present in the powder.

Assignees

• Siemens Energy Global Gmbh & Co Kg

Inventors

• Krausz Ivo
• Lange Friederike
• Nikasch Christian

Classifications

• C04B2235/3222

  Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4) · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B35/10 Primary

  based on aluminium oxide · CPC title

• C04B35/117 Primary

  Composites · CPC title

• C04B2235/322

  Transition aluminas, e.g. delta or gamma aluminas · CPC title