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US 6,562,409 B2Granted
Method for forming a rare earth silicate coating on a silicon based ceramic component by controlled oxidation for improved corrosion resistance
AssigneeCaterpillar Inc.
InventorsKent A. Koshkarian, Seung K. Lee, Michael J. Readey
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Abstract
A low cost process for self-forming a uniformly adherent protective rare earth silicate coating on a silicon-based ceramic component for protecting the component against corrosive/erosive environments. The coating is self-formed by an oxidation process of a silicon-based ceramic associated with a reaction between a silica (SiO2) film layer on the surface of silicon-based ceramic and the rare earth oxide existing inside of silicon-based ceramic component.
Claims13
A method of forming a rare-earth silicate surface treatment comprising:
- preparing a silicon-based component, wherein said silicon-based component includes a rare earth doped ceramic;
- heating said silicon-based component to about 1100 degrees Centigrade or greater to form silica on said silicon-based component;
- and
- reacting said rare earth doped ceramic with said silica so as to form a rare earth silicate coating,
- wherein said silicon-based component includes molybdenum disilicide.
2 more elements
A process for coating a silicon-based component, comprising:
- forming a silicon-based component, wherein said silicon-based component includes a rare earth-doped ceramic
- disposing a heating element within the silicon-based component;
- raising the temperature of the heating element to heat the silicon-based component from within;
- forming a silica layer on the silicon-based component by oxidizing the silicon-based component;
- reacting the rare earth-doped ceramic of the silicon-based component with the silica layer to form a rare earth silicate coating on the silicon-based component.
2 more elements
Dependencies are inferred from the claim text.