Claims
- 1. A brush seal system including brush bristles are of a superalloy composition, and coated with a coating consisting of from about 40 to about 60 vol % of a hard carbide phase consisting principally of chrome carbide particles, having a typical particle size of about 44-15 μ, in a nickel-chrome matrix whose nominal composition is about 80% nickel and 20% chromium.
- 2. A brush seal system as claimed in claim 1 wherein the carbide phase contains other carbides selected from the group consisting of titanium carbide, tungsten carbide, vanadium carbide and mixtures thereof.
- 3. A brush seal system as claimed in claim 2 wherein the carbide phase consists of at least about 50% by vol of chrome carbide.
- 4. A brush seal system as in claim 1 wherein the nickel-chrome matrix phase contains up to about 10% of a material selected from the group consisting of iron and cobalt and mixtures thereof, and up to about 10% total of a material selected from the group consisting of up to about 5% tungsten, up to about 5% tantalum, up to about 5% niobium, up to about 5% molybdenum, and mixtures thereof.
- 5. A brush seal system as claimed in any preceding claim which exhibits compressive residual stresses.
- 6. A brush seal system as in claim 1 wherein the coating has a thickness of more than about 8 mils (0.2 mm).
- 7. A brush seal system as in claim 6 wherein the coating is substantially crack free.
- 8. A brush seal system as in claim 1 wherein the coating is substantially crack free.
- 9. A method of making a brush seal system consisting of: using an HVOF process to deposit a coating composition onto superalloy brush bristles, the coating consisting of 40-60 vol percent of a carbide phase in a nickel-chrome matrix, using powder of less than about 325 US Standard Mesh, wherein said coating has a thickness in excess of about 8 mils and is substantially crack free.
Parent Case Info
This is a division of continuing application Ser. No. 08/950,659, filed on Oct. 15, 1997, now U.S. Pat. No. 6,186,508.
US Referenced Citations (17)
Non-Patent Literature Citations (1)
Entry |
P&W Specification 53, pp. 1-11. |