摘要:
Oxidation-resistant ferritic steel alloys for high temperature applications consist essentially of chromium (Cr) in an amount from about 18 to about 25 atom percent, tungsten (W) in an amount from about 0.5 to about 2 atom percent, manganese (Mn) in an amount less than about 0.8 atom percent, aluminum (Al) in an amount less than about 0.2 atom percent, silicon (Si) in an amount less than about 0.1 atom percent, and rare earth metals that includes neodymium (Nd) in an amount from about 0.002 to about 0.2 atom percent with the balance being iron (Fe). Also disclosed herein are solid oxide fuel cells that include separators formed for the oxidation resistant ferritic alloys.
摘要:
An alloy for an interconnect for a fuel cell is provided. The alloy comprises iron at least about 60 weight percent, chromium in the range of about 15 to about 30 weight percent and tungsten in the range of about 3 to about 4.5 weight percent. The alloy also includes at least one element selected from the group consisting of aluminum, yttrium, zirconium, lanthanum, manganese, molybdenum, nickel, vanadium, tantalum, and titanium.
摘要:
One exemplary embodiment of a turbine component (which may be a blade) comprises a substrate comprising a silicide-based material, a plurality of through holes disposed in the substrate, the holes being configured to receive an airflow, a silicide coating disposed at the surfaces of the substrate and the through holes, and a thermal barrier coating disposed at the silicide coating. In another exemplary embodiment the silicide coating may be replaced by a Laves phase-containing layer. In still another exemplary embodiment the silicide coating may be replaced by a diffusion barrier layer disposed at a surface of the substrate and a platinum group metal layer disposed at the diffusion barrier layer. One exemplary embodiment of a blade may comprise an airfoil comprising a silicide-based material and through holes disposed therein, a cooling plenum disposed in the airfoil, and a base configured to receive the airfoil in a dovetail fit, the base comprising a superalloy.
摘要:
A refractory composition is described, containing niobium, silicon, titanium, and at least one of rhenium and ruthenium. The amount of silicon in the composition is at least about 9 atom %, and the amount of titanium present is less than about 26 atom %, based on total atomic percent. Turbine engine components formed from such a composition are also disclosed.
摘要:
A turbine engine component comprising a substrate made of a nickel-base or cobalt-base superalloy and a protective coating overlying the substrate, the coating formed by electroplating at least two platinum group metals selected from the group consisting of platinum, palladium, rhodium, ruthenium and iridium. The protective coating is typically heat treated to increase homogeneity of the coating and adherence with the substrate. The component typically further comprises a ceramic thermal barrier coating overlying the protective coating. Also disclosed are methods for forming the protective coating on the turbine engine component by electroplating the platinum group metals.
摘要:
A turbine component comprises a substrate; and a crystalline coating disposed on a surface of the substrate, wherein the crystalline coating comprises tin and yttrium in an amount greater than or equal to about 0.05 atomic percent based upon the total coating. A method of making a turbine component comprises disposing a coating composition on a substrate, wherein the coating composition comprises tin and yttrium in an amount greater than or equal to about 0.1 atomic percent based upon the total coating composition. A crystalline coating comprises tin and yttrium in an amount greater than or equal to about 0.05 atomic percent based upon the total coating.
摘要:
Disclosed herein is a composition comprising iron; about 18 to about 30 wt % chromium; up to about 7 wt % tungsten; up to about 1.5 wt % manganese; up to about 1 wt % aluminum; about 0.02 to about 0.1 wt % of a rare earth metal and/or yttrium; wherein the weight percents are based on the total weight of the composition. Disclosed herein too is a method comprising melting together a composition comprising iron; about 18 to about 30 wt % chromium; up to about 7 wt % tungsten; up to about 1.5 wt % manganese; up to about 1 wt % aluminum; about 0.02 to about 0.1 wt % of a rare earth metal and/or yttrium; wherein the weight percents are based on the total weight of the composition; casting the composition; and rolling the composition.
摘要:
A refractory composition comprising niobium and silicon is disclosed. The amount of silicon present is less than about 9 atom %, based on total atomic percent for the composition. A turbine engine component (e.g., a gas turbine) is also described herein. The component comprises an alloy of niobium and silicon, wherein the amount of silicon present is less than about 9 atom %.
摘要:
A conductive element comprises a metal core and a coating, wherein the coating comprises at least one layer of aluminum, an aluminum alloy, an aluminide, silicon, a silicon alloy, a silicide, and combinations thereof, and wherein the at least one layer has a predetermined thickness. A method of making a conductive element comprises depositing a coating material on a metal core to form a coated metal core and heating the coated metal core to a predetermined temperature to form at least one layer of aluminum, an aluminum alloy, an aluminide, silicon, a silicon alloy, a silicide, and combinations thereof.
摘要:
An alloy, an article comprising the alloy, and methods for manufacturing and repairing an article that employ the alloy are presented. The alloy comprises, in atom percent, at least about 50% rhodium, up to about 49% of a first material, from about 1% to about 15% of a second material, and up to about 10% of a third material. The first material comprises at least one of palladium, platinum, iridium, and combinations thereof. The second material comprises at least one of tungsten, rhenium, and combinations thereof. The third material comprises at least one of ruthenium, chromium, and combinations thereof. The alloy comprises an A1-structured phase at temperatures greater than about 1000° C., in an amount of at least about 90% by volume.