| 摘要 |
<p>A nickel based single crystal superalloy comprising 3-11wt% cobalt, 4.7-5.7wt% chromium, 2.4-3.0wt% molybdenum, 3.0-3.8wt% tungsten, 3.0-3.8wt% rhenium, 5.5-7.0wt% aluminium, 5.0-6.0wt% tantalum, 0.5-1.0wt% niobium, 0-0.2wt% hafnium, 0-150ppm carbon, 0-100ppm yttrium, 0-100ppm lanthanum, 0-5ppm sulphur and the balance nickel plus incidental impurities. The nickel based single crystal superalloy is suitable for use as a gas turbine engine turbine blade or turbine vane. It is of particular use on cooled turbine blades and turbine vanes which have ceramic thermal barrier coatings, because the superalloy is compatible with the ceramic thermal barrier coating to minimise spalling. The superalloy has lower density than other second generation single crystal superalloys but similar creep strength and oxidation resistance. <IMAGE></p> |
