Braze-based protective coating for silicon nitride
AssigneeHoneywell International Inc.
InventorsDerek Raybould, Chien-Wei Li, Thomas E. Strangman, Bjoern Schenk
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Abstract
A component comprising a silicon-based substrate and a braze-based protective coating disposed on the silicon-based substrate. The braze-based coating comprises a brazed layer, wherein the brazed layer comprises at least one intermetallic compound. A scale layer may be formed on the brazed layer. An environmental barrier coating may be disposed directly on the brazed layer or directly on the scale layer. A thermal barrier coating may be disposed on the environmental barrier coating. Methods for making a Si-based component having a braze-based protective coating are also disclosed.
Claims37
A component, comprising:
- a silicon-based substrate;
- and
- a braze-based coating disposed on said silicon-based substrate, wherein said braze-based coating comprises:
- a brazed layer comprising an intermetallic compound dispersion of silicon nitride particles, silicon oxynitride particles, or a mixture thereof, wherein said brazed layer provides a barrier to the diffusion of oxygen therethrough.
A component, comprising:
- a silicon-based substrate;
- and
- a braze-based coating disposed on said silicon-based substrate, wherein said braze-based coating comprises:
- a brazed layer disposed on said silicon-based substrate, the brazed layer comprising an intermetallic compound a dispersion of silicon nitride particles, silicon oxynitride particles, or a mixture thereof;
- an environmental barrier coating disposed on said brazed layer;
- and
- a thermal barrier coating disposed on said environmental barrier coating, wherein said brazed layer provides a barrier to the diffusion of oxygen therethrough.
A component, comprising:
- a silicon-based substrate;
- and
- a braze-based coating disposed on said silicon-based substrate, wherein said braze-based coating comprises:
- a brazed layer disposed directly on said silicon-based substrate;
- a scale layer disposed on said brazed layer;
- an environmental barrier coating disposed on said scale layer;
- and
- a thermal barrier coating disposed on said environmental barrier coating,
- wherein said brazed layer comprises an intermetallic compound a dispersion of silicon nitride particles, silicon oxynitride particles, or a mixture thereof, and
- wherein said intermetallic compound is selected from the group consisting of TaSi2, Ta3Si3, Ta2Si, MoSi2, Mo5Si3, ScSi, Sc5Si3, YbSi, YbSi1.8, Yb3Si5, Yb5Si3, YSi, Y3Si5, and Y5Si3.
A protective coating for a silicon-based substrate, comprising:
- a brazed layer;
- and
- a scale layer disposed on said brazed layer,
- wherein said brazed layer comprises an intermetallic compound having a dispersion therein of silicon nitride particles, silicon oxynitride particles, or a mixture thereof, and
- said intermetallic compound comprises Si and an element selected from the group consisting of Ta, Mo, Sc, Y, and Yb.
A braze-based composition for joining together two or more ceramic components, comprising:
- from about 10 to 95 wt. % of an intermetallic compound selected from the group consisting of TaSi2, Ta5Si3, Ta2Si, MoSi2, Mo5Si3, ScSi, Sc5Si3, YbSi, YbSi1.8, Yb3Si5, Yb5Si3, YSi, Y3Si5, and Y5Si3, and a dispersion of silicon nitride particles, silicon oxynitride particles, or a mixture thereof, wherein said braze-based composition is formed by reacting constituents of a braze mixture applied to a surface of a substrate, and wherein said braze-based composition is bonded to said surface of said substrate.
Dependencies are inferred from the claim text.