Avco Corporation

Textron Corporation

Textron/avco Corp.

Subhash K Naik

Louis J Fiedler

William H Doddman

Vinod K Nangia

Nickel aluminide single crystal alloys having improved strength and ductility at elevated temperatures, produced by major elemental additions to strengthen the Ni.sub.3 Al phase by solid solutioning and/or secondary phase formation. The major elemental additions comprise (by weight) 7-20% Al, 0.5-9% molybedenum, 0.5-10% tungsten and 2-15% titanium. Optional minor elemental additions of boron, manganese, silcon and/or hafnium are preferred.

Nickel aluminide base single crystal alloys

Abradable wall structures for high temperature applications, such as in turbine housings and the like. The wall structures comprise a superalloy metal base plate supporting a superalloy metallic cellular structure, the cells of which are filled to a substantial extent with at least one ceramic core material providing high heat resistance, oxygen barrier and low thermal expansion properties. The invention involves the application of a porous or pore-forming surface composition to provide a corrosion-resistant, erosion-resistant abradable outer surface layer, the softness or porosity of which can be tailored to improve the abradability of the wall structure, while imparting oxidation-, corrosion- and erosion-resistance to the structure. The surface layer composition may comprise metal superalloy, ceramic or cermet base compositions containing fugitive or retained inert filler materials.

Process for making abradable hybrid ceramic wall structures

Disclosed are novel nickel base single crystal alloy compositions consisting essentially of, by weight, about 4.0-10.0% chromium, 1.5-6.0% cobalt, 1.0-12.0% molybdenum, 3.0-10.0% tungsten, 2.5-7.0% titanium, 2.5-7.0% aluminum, 3.0-10.0% tantalum, about 0.02%-1.5% of hafnium and/or about 0.02%-1.0% silicon, from about 0.02%-1.0% each of yttrium and/or lanthanum, from about 0.3% to about 8.0% rhenium; from about 0.2% to about 4.0% vanadium and/or from about 0.2% to about 4.0% niobium; from about 0.02% to about 3% platinum; from about 0 to about 1.0% boron, the balance nickel, and the balance nickel. Methods of thermal treatment and coating of the novel alloys to enhance their mechanical properties are also disclosed, as are articles produced by such methods.

High strength nickel base single crystal alloys having enhanced solid

Abradable hybrid ceramic wall structures

Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate by applying to the substrate a first layer comprising palladium, platinum or nickel in direct contact with the substrate and then applying a second layer which overcoats the first layer, the second layer being comprises of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases therein. In another embodiment erosion resistance is imparted by employing a coating which comprises a first ductile layer on the substrate of palladium, platinum or nickel; a second layer comprising substantially pure tungsten; and a third layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases.

Method for imparting erosion-resistance to metallic substrate

Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate in one embodiment by applying to the substrate a first ductile layer comprising a metal from Group VI to Group VIII elements as well as the noble metal group of elements, and a second hard erosion-resistant layer applied on the first layer comprising a boride, carbide, nitride or oxide of a metal selected from Group III to Group VI elements, the first layer capable of retaining substrate integrity and preventing diffusion of material from the second layer into the substrate. Another embodiment defines another layer of a substantially pure metal from Group III to Group VI between the first and second layers. Still another embodiment defines that in the second layer the content of either the carbide, nitride, boride or oxide is graded, i.e. the concentration of either the carbide, nitride, boride or oxide is greatest (higher) toward the top surface of the second layer, and decreases toward the bonding surface between the second and first layer.

Method for imparting erosion-resistance to metallic substrates

Disclosed are novel nickel base single crystal alloy compositions consisting essentially of, by weight, about 8.0-14.0% chromium, 1.5-6.0% cobalt, 0.5-2.0% molybdenum, 3.0-10% tungsten, 2.5-7.0% titanium, 2.5-7.0% aluminum, 3.0-6.0% tantalum, about 0.005% to about 1.0% each of hafnium and/or silicon, optional minor amounts of yttrium, lanthanum and/or manganese, and the balance nickel. Methods of thermal treatment and coating of the novel alloys to enhance their mechanical properties are also disclosed, as are articles produced by such methods.

High strength nickel base single crystal alloys

Erosion-resistant coating system

Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate by applying to the substrate a first layer comprising palladium, platinum or nickel in direct contact with the substrate and then applying a second layer which overcoats the first layer, the second layer being comprised of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases therein. In another embodiment erosion resistance is imparted by employing a coating which comprises a first ductile layer on the substrate of palladium, platinum or nickel; a second layer comprising substantially pure tungsten; and a third layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases.

Disclosed is a novel high temperature coating system comprised of two successively deposited layers of different respective materials which may be applied to turbine engine components to provide improved oxidation and corrosion resistance. The second applied layer is a composition having the general formula MCrAlY wherein M is a solid solution of molybdenum in nickel, cobalt or nickel plus cobalt. The first applied layer or interlayer, which is applied directly to the turbine engine component, is an aluminum coating.

High temperature oxidation/corrosion resistant coatings

Disclosed are novel nickel-base single crystal alloy compositions consisting essentially of, by weight, about 8.0-14.0% chromium, 1.5-6.0% cobalt, 0.5-2.0% molybdenum, 3.0-10.0% tungsten, 2.5-7.0% titanium, 2.5-7.0% aluminum, 3.0-6.0% tantalum and the balance nickel. A combination of thermal treatment and coating of the novel alloys to enhance their mechanical properties is also disclosed.

Disclosed are novel high temperature coatings which may be applied to turbine engine components to provide improved thermal fatigue resistance as well as improved oxidation and corrosion resistance. The compositions have one of the following general formulas:

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Milford, CT, United States of America

Subhash K Naik