| 摘要 |
Described herein a bucket for use in the last stage of a steam turbine engine. The bucket includes a titanium-based alloy having a leading edge wherein the leading edge includes titania having a plurality of pores and a top sealing layer filling the plurality of pores, the sealing layer selected from the group consisting of: chromium, cobalt, nickel, polyimide, polytetrafluoroethylene and polyester. |
| 主权项 |
1. A bucket for use in the last stage of a steam turbine engine, said bucket comprising:
a titanium-based alloy having between about 3% and 6.25% by weight aluminum, up to 3.5% vanadium, up to 2.25% tin, up to 2.25% zirconium, between about 1.75% and 5.0% molybdenum, up to 2.25% chromium, up to 0.7% silicon and up to 2.3% iron, with the balance being titanium; said bucket comprising a leading edge wherein said leading edge comprises titania having a plurality of pores and wherein the titania has a thickness of from about 20 microns to about 150 microns, said titania directly adhered to the titanium-based alloy, and a top sealing layer filling the plurality of pores. |
