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Nickel based superalloyRelated Patent Categories: Stock Material Or Miscellaneous Articles, All Metal Or With Adjacent Metals, Composite; I.e., Plural, Adjacent, Spatially Distinct Metal Components (e.g., Layers, Joint, Etc.), With Additional, Spatially Distinct Nonmetal Component, Oxide-containing ComponentNickel based superalloy description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070059550, Nickel based superalloy. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to nickel based superalloys, particularly to nickel based single crystal superalloys, or particularly nicked based single crystal superalloys for use as turbine blades, turbine vanes, turbine seals and combustor components of gas turbine engines, but they may be used in internal combustion engines etc. [0002] Nickel based single crystal superalloys have been developed to provide improved high temperature mechanical properties such as creep strength. However, there are many other important properties, which need to be optimised to a high level in order for a nickel based single crystal superalloy to be acceptable for use in a gas turbine engine. Other properties, which need to be optimised, are density, resistance to oxidation, resistance to corrosion, compatibility with protective coatings, heat treatment response and castability. [0003] There are three generations of nickel based single crystal superalloys which differ by the amount of the key element rhenium. The first generation of nickel based single crystal superalloys contained no rhenium, examples of these are disclosed in published UK patent application nos. GB2039296A, GB2073774A, GB2105369A, GB2106138A and GB2151659A. The first generation of nickel based single crystal superalloys have densities of 7.9 to 8.7 gm per cm.sup.3. The second generation of nickel based single crystal superalloys contained about 3 wt % rhenium, examples of these are disclosed in published European patent application nos. EP0155827A and EP0208645A. The second generation of nickel based single crystal superalloys have densities of 8.7 to 8.9 gm per cm.sup.3. The second generation of nickel based single crystal superalloys have a benefit in creep strength capability of about 30.degree. C. over the first generation of nickel based single crystal superalloys. The third generation of nickel based single crystal superalloys contained about 6 wt % rhenium, examples of these are disclosed in U.S. Pat. Nos. 5,366,695 and 5,270,123 and published European patent application no. EP0848071A. The third generation of nickel based single crystal superalloys have densities of 8.9 to 9.1 gm per cm.sup.3. The third generation of nickel based single crystal superalloys have a benefit in creep strength capability of about 30.degree. C. over the second generation of nickel based single crystal superalloys. However, the third generation of nickel based single crystal superalloys may also have narrow heat treatment ranges, which incur manufacturing costs. The high levels of strengthening elements, such as rhenium and tungsten, that are added also have a detrimental effect on the metallurgical stability of the third generation of nickel based single crystal superalloys. [0004] Thus it is seen that the increase in creep strength is to the detriment of the density and the cost of the superalloy. An increase in density of the turbine blades and turbine vanes makes the gas turbine engine heavier and also results in a requirement to make the turbine rotor disc stronger to carry the heavier turbine blades, which also results in an increase in the weight of the turbine rotor disc. [0005] The metal temperature of the investment cast turbine blades, or turbine vanes, is frequently reduced by air cooling of the turbine blades, or turbine vanes. It is often the case that cooled turbine blades, or turbine vanes, are protected by ceramic thermal barrier coatings. A major concern with a ceramic thermal barrier coating is that the ceramic thermal barrier coating will spall prematurely during engine service. The adherence of a ceramic thermal barrier coating is influenced by many factors, but a major factor is the composition of the superalloy substrate on which the ceramic thermal barrier coating is deposited. [0006] The present invention seeks to provide a novel nickel based single crystal superalloy, which has a capability greater than the second generation of nickel based single crystal superalloys, but which is metallurgically stable without excessive costs. [0007] Accordingly the present invention provides a nickel based single crystal superalloy comprising 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 0-2.4 wt % molybdenum, 4-8 wt % tungsten, 3.5-6 wt % rhenium, 5-6.5 wt % aluminium, 6.5-8.5 wt % tantalum, 0-0.2 wt % hafnium and the balance nickel plus incidental impurities. [0008] Preferably the nickel based single crystal superalloy comprises 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 0-2.4 wt % molybdenum, 4-7.5 wt % tungsten, 3.5-5.8 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0009] Preferably the nickel based single crystal superalloy comprises 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 2-2.4 wt % molybdenum, 4-5 wt % tungsten, 3.5-4.5 wt % rhenium, 5-6.5 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0010] Preferably the nickel based single crystal superalloy comprises 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 2-2.4 wt % molybdenum, 4-5 wt % tungsten, 3.5-4.5 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0011] Preferably the nickel based single crystal superalloy comprises 7.7-8.3 wt % cobalt, 3.7-4.3 wt % chromium, 2-2.4 wt % molybdenum, 4.3-4.9 wt % tungsten, 3.8-4.4 wt % rhenium, 5.5-6.1 wt % aluminium, 7.2-7.8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0012] The nickel based single crystal superalloy may comprise 8 wt % cobalt, 4 wt % chromium, 2.2 wt % molybdenum, 4.6 wt % tungsten, 4.1 wt % rhenium, 5.8 wt % aluminium, 7.5 wt % tantalum, 0.1 wt % hafnium and the balance nickel plus incidental impurities. [0013] Alternatively the nickel based single crystal superalloy comprises 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 6-8 wt % tungsten, 4.8-5.8 wt % rhenium, 5-6.5 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0014] The nickel based single crystal superalloy may comprise 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 6-8 wt % tungsten, 4.8-5.8 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0015] The nickel based single crystal superalloy may comprise 7.7-8.3 wt % cobalt, 3.7-4.3 wt % chromium, 6.5-7.5 wt % tungsten, 5.0-5.6 wt % rhenium, 5.5-6.1 wt % aluminium, 7.0-8.0 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0016] The nickel based single crystal superalloy may comprise 8 wt % cobalt, 4 wt % chromium, 7 wt % tungsten, 5.3 wt % rhenium, 5.8 wt % aluminium, 7.5 wt % tantalum, 0.1 wt % hafnium and the balance nickel plus incidental impurities. [0017] The present invention also provides a cast single crystal nickel based superalloy article comprising 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 0-2.4 wt % molybdenum, 4-8 wt % tungsten, 3.5-6 wt % rhenium, 5-6.5 wt % aluminium, 6.5-8.5 wt % tantalum, 0-0.2 wt % hafnium and the balance nickel plus incidental impurities. [0018] Preferably the cast single crystal nickel based superalloy article comprises 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 0.2.4 wt % molybdenum, 4-7.5 wt % tungsten, 3.5-5.8 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0019] Preferably the cast single crystal nickel based superalloy article comprises 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 2-2.4 wt % molybdenum, 4-5 wt % tungsten, 3.5-4.5 wt % rhenium, 5-6.5 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0020] Preferably the cast single crystal nickel based superalloy article comprises 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 2-2.4 wt % molybdenum, 4-5 wt % tungsten, 3.5-4.5 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0021] Preferably the cast single crystal nickel based superalloy article comprises 7.7-8.3 wt % cobalt, 3.7-4.3 wt % chromium, 2-2.4 wt % molybdenum, 4.3-4.9 wt % tungsten, 3.8-4.4 wt % rhenium, 5.5-6.1 wt % aluminium, 7.2-7.8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0022] The cast single crystal nickel based superalloy article may comprise 8 wt % cobalt, 4 wt % chromium, 2.2 wt % molybdenum, 4.6 wt % tungsten, 4.1 wt % rhenium, 5.8 wt % aluminium, 7.5 wt % tantalum, 0.1 wt % hafnium and the balance nickel plus incidental impurities. [0023] Alternatively the cast single crystal nickel based superalloy article comprises 7-9 wt % cobalt, 3.5-4.5 wt % chromium, 6-8 wt % tungsten, 4.8-5.8 wt % rhenium, 5-6.5 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. [0024] The cast single crystal nickel based superalloy article may comprise 7.5-8.5 wt % cobalt, 3.5-4.5 wt % chromium, 6-8 wt % tungsten, 4.8-5.8 wt % rhenium, 5.3-6.3 wt % aluminium, 7-8 wt % tantalum, 0.05-0.15 wt % hafnium and the balance nickel plus incidental impurities. Continue reading about Nickel based superalloy... Full patent description for Nickel based superalloy Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Nickel based superalloy patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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