Claims
- 1. An article, comprising a silicon-containing substrate and a 25 to 500 micron thick zircon coating containing a modifier selected from cordierite (2MgO.2Al2O3.5SiO2), fused silica (SiO2), silicon (Si) and mixtures thereof that modifies a coefficient of thermal expansion (CTE) of the zircon coating to a CTE that is closer to the CTE of the substrate, wherein said substrate is a composite comprising a silicon-based matrix and a reinforcing fiber, particulate or whisker.
- 2. The article of claim 1, wherein said zircon comprises ZrSiO4.
- 3. The article of claim 1, wherein said substrate comprises silicon carbide (SiC) or silicon nitride (Si3N4).
- 4. The article of claim 1, wherein said substrate comprises a monolithic silicon carbide (SiC) or a monolithic silicon nitride (Si3N4).
- 5. The article of claim 1, wherein said substrate comprises a silicon carbide (SiC) fiber-reinforced silicon carbide (SiC) matrix composite, a carbon fiber-reinforced silicon carbide (SiC) matrix composite or a silicon carbide (SiC) fiber-reinforced silicon nitride (Si3N4) composite.
- 6. The article of claim 1, wherein said substrate comprises a silicon carbide (SiC) fiber-reinforced silicon carbide/silicon (SiC/Si) matrix composite processed by silicon melt infiltration.
- 7. The article of claim 1, wherein said zircon coating comprises a zirconia phase stabilizer.
- 8. The article of claim 7, wherein said phase stabilizer comprises yttria (Y2O3), magnesia (MgO) or calcia (CaO).
- 9. The article of claim 1, wherein said zircon coating is an external coating for application in an environment free from water vapor.
- 10. The article of claim 1, further comprising an oxide external environmental/thermal barrier coating.
- 11. The article of claim 10, wherein said oxide external environmental/thermal barrier coating is selected from the group consisting of yttria-stabilized zirconia, scandia-stabilized zirconia, calcia-stabilized zirconia, magnesia-stabilized zirconia and mixtures thereof.
- 12. The article of claim 1, shaped into an engine part.
- 13. The article of claim 12, wherein said part is a gas turbine engine part or an aircraft engine part.
Government Interests
This invention was made with government support under Contract No. NAS3-26385 awarded by NASA. The government may have certain rights in the invention.
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