2762 results about "Nickel based" patented technology

A nanocomposite comprising a plurality of nanoparticles dispersed in a metallic alloy matrix, and a structural component formed from such a nanocomposite. The metallic matrix comprises at least one of a nickel-based alloy and an iron-based alloy. The nanocomposite contains a higher volume fraction of nanoparticle dispersoids than those presently available. The structural component include those used in hot gas path assemblies, such as steam turbines, gas turbines, and aircraft turbine. A method of making such nanocomposites is also disclosed.

A method of welding a gas turbine engine substrate composed of a gamma prime precipitation strengthened nickel based superalloy, including the steps of: applying weld beads on the substrate to form a continuous layer the thickness of the weld beads; using a filler material made of a first material exhibiting comparable strength and ductility as the substrate, and a second material exhibiting greater ductility than the substrate; and creating crack propagation mitigating regions within the continuous layer by increasing the percentage of the second material in the crack propagation mitigating regions over the percentage of the second material in the remainder of the continuous layer.

A laser cladding process of an exterior wear-resisting anti-corrosive alloy coating of a slide chair of a railway switch comprises processes as follows: firstly, the surface of the slide chair is pre-heated, which means the surface of the slide chair is degreased and de-rusted under room temperature; and the surface is cleaned up by alcohol; then alloy powder is prefabricated, which means iron-base, nickel-base or cobalt base alloy powders that are ready for cladding are preplaced on the processed surface of the slide chair, and a scraping straightedge provided with a rail is used for adjusting the pretreated metal powder so that the alloy powder can be distributed on the surface of the slide chair evenly and has proper thickness to meet the thick requirement of the coating after cladding; and finally, the slide chair is hardened by the laser cladding; the laser of CO2 gas is adopted; a numerical control machine is used as a working table and the surface of the slide chair is hardened by the laser cladding. The laser cladding process has the characteristics of no pollution, high production rate, low energy consumption, the little finishing allowance of cladding coating and low combined cost.

A metal powder for use in a metal laser-sintering wherein a three-dimensional shaped object is produced by irradiating a powder layer of the metal powder with a light beam to form a sintered layer and thereby laminating the sintered layers. The metal powder of the present invention is characterized in that it comprises an iron-based powder and at least one kind of powder selected from the group consisting of a nickel powder, a nickel-based alloy powder, a copper powder, a copper-based alloy powder and a graphite powder; and the iron-based powder has been annealed. In such metal powder, the iron-based powder is in a softened state due to the annealing treatment thereof. Accordingly, the use of the metal powder in a metal laser-sintering process makes it possible to reduce a machining resistance attributable to the residual metal powder adherent to the surface of the shaped object, which leads to an achievement of an extended lifetime of a machining tool.

The invention relates to a method for welding a carbon steel composite pipe of a thin iron-nickel-based alloy. The method comprises: processing a step on the end part of the composite pipe; adopting the surfacing of argon arc welding on the surface of the step and trimming the surfacing layer; processing a groove; adopting tungsten electrode argon arc welding to carry out three-point positioning of spot welding evenly around a welding seam, and adopting the tungsten electrode argon arc welding to carry out back welding on the root; and adopting manual electric arc welding to carry out filling welding and overlay welding on the upper part of a second layer of back welding. The chemical compositions of a welding material by weight percentage: 0.02 to 0.1 percent of C, 0.2 to 1.0 percent of Si, 1.0 to 2.2 percent of Mn, 20.0 to 31.5 percent of Cr, 40.0 to 60.0 percent of Ni, 8.0 to 14.5 percent of Mo, 0.5 to 2.5 percent of Cu, 0 to 5.0 percent of Co, 0.3 to 4.2 percent of Nb, and the balance being Fe. The welding seam has the characteristics of no sensitivity to offset, favorable corrosion resistance, high strength and favorable plastic toughness.

Methods for repairing nickel based alloy articles such as gas turbine rotors generally includes a removing a damaged portion of the articles and laser cladding a high temperature nickel based alloy powder thereto to form a solid layer. The process can be repeated until a desired thickness is obtained. Optionally, a peening process subsequent to laser cladding can be implemented to introduce compressive stress to the solid layer formed by laser cladding.

A layered lithium-nickel-based compound oxide powder for a positive electrode material for a high density lithium secondary cell, capable of providing a lithium secondary cell having a high capacity and excellent in the rate characteristics also, is provided. A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, characterized in that the bulk density is at least 2.0 g/cc, the average primary particle size B is from 0.1 to 1 μm, the median diameter A of the secondary particles is from 9 to 20 μm, and the ratio A/B of the median diameter A of the secondary particles to the average primary particle size B, is within a range of from 10 to 200. In production of a layered lithium-nickel-based compound oxide powder, which comprises spray drying a slurry having a nickel compound and a transition metal element compound capable of substituting lithium other than nickel, dispersed in a liquid medium, followed by mixing with a lithium compound, and firing the mixture, the spray drying is carried out under conditions of 0.4≦G/S≦4 and G/S≦0.0012 V, when the slurry viscosity at the time of the spray drying is represented by V (cp), the slurry supply amount is represented by S (g/min) and the gas supply amount is represented by G (L/min).

The invention discloses a composite reinforced wear-resistant part of a metal-ceramic prefabricated member and a manufacturing method of the composite reinforced wear-resistant part. The manufacturing method comprises the steps as follows: uniformly mixing ceramic particles with self-fluxing alloy powder to obtain a mixture; filling a mould cavity of a pressing machine with the mixture, pressing by pressure, forming and demoulding, and placing biscuits and gaskets into a drying box for drying; placing the dried biscuits and gaskets into a vacuum furnace for sintering, cooling and discharging to obtain the metal-ceramic composite prefabricated member; carrying out sand blasting on the prefabricated member, and spraying a layer of nickel-based self-fluxing alloy powder onto the surface of the prefabricated member; and placing the processed fabricated member onto the end surface of a cast cavity, and pouring metal liquid formed by smelting metal matrix materials into the bottom of the cast cavity to obtain the composite reinforced wear-resistant part of the metal-ceramic prefabricated member. According to the manufacturing method, the wear resistance and the impact resistance of the composite wear-resistant part are improved.

An article for use in hostile thermal environments, such as a component of a gas turbine engine. The article includes a nickel-base superalloy substrate that is prone to formation of a deleterious secondary reaction zone (SRZ), and an overlay coating having a predominantly gamma prime-phase nickel aluminide (Ni₃Al) composition suitable for use as an environmental coating, including a bond coat for a thermal barrier coating. The coating comprises a chromium-containing nickel aluminide intermetallic overlay coating of predominantly the gamma prime phase, in which aluminum is present in the coating in an amount approximately equal to the aluminum content of the superalloy substrate so as to inhibit diffusion of aluminum from the overlay coating into the superalloy substrate.

Erosion resistant coating compositions include hard particles in a metal matrix such as nickel-based, cobalt-based and iron-based matrices applied by a plating process for complex geometry or hard to access component surfaces or by thermal spray processes for line of sight applications. These materials and processes are especially suited for providing erosion resistance to hydroelectric turbine components.

Ni-based Cr- and P-bearing alloys that can from centimeter-thick amorphous articles are provided. Within the family of alloys, millimeter-thick bulk-glassy articles can undergo macroscopic plastic bending under load without fracturing catastrophically.

A low solvus, high refractory alloy having unusually versatile processing mechanical property capabilities for advanced disks and rotors in gas turbine engines. The nickel base superalloy has a composition consisting essentially of, in weight percent, 3.0–4.0 Al, 0.02–0.04 B, 0.02–0.05 C, 12.0–14.0 Cr, 19.0–22.0 Co, 2.0–3.5 Mo, greater than 1.0 to 2.1 Nb, 1.3 to 2.1 Ta, 3.0–4.0 Ti, 4.1 to 5.0 W, 0.03–0.06 Zr, and balance essentially Ni aid incidental impurities. The superalloy combines ease of processing with high temperature capabilities to be suitable for use in various turbine engine disk, impeller, and shaft applications. The Co and Cr levels of the superalloy can provide low solvus temperature for high processing versatility. The W, Mo, Ta, and Nb refractory element levels of the superalloy can provide sustained strength, creep, and dwell crack growth resistance at high temperatures.

A turbine engine component comprising a substrate made of a nickel-base or cobalt-base superalloy, a non-metallic oxide or nitride diffusion barrier layer overlying the substrate, and a protective coating overlying the barrier layer, the protective coating comprising at least one platinum group metal selected from the group consisting of platinum, palladium, rhodium, ruthenium and iridium. The diffusion barrier layer may be a deposited or thermally grown oxide material, especially aluminum oxide. The protective coating may be 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 a protective coating system on the turbine engine component by forming the non-metallic oxide or nitride diffusion barrier layer on the substrate and then depositing the platinum group metal on top of the barrier layer.

The invention provides a method for welding with a laser-cold metal transferred arc composite heat source, and belongs to the technical field of composite heat sources. The welding method solves the technical problems of low-quality welding lines and low arc stability of the pure Ar-protected cold metal transferred arc welding. The method comprises the following steps of: using pure Ar gas for protection during welding, and forming a novel composite heat source by using the cold metal transferred arc(5) and a laser beam (2) of which the power is more than or equal to 800, wherein the laser beam (2) is defocused, the diameter of a laser spot formed by the laser beam (2) on the surface of a workpiece (1) to be welded is 1 to 4mm, a spot of the cold metal transferred arc (5) can be arranged in front of or behind the spot of the laser beam (2), the central distance of the two spots is 0 to 8mm, and an included angle between a welding torch(3) of the cold metal transferred arc(5) and the horizontal plane is 45 and 75 degrees. The composite heat source is mainly used for welding plates and tubes made of stainless steel, high-strength steel and nickel-based alloy.

The invention belongs to the technical field of nickel based wrought superalloy, and particularly relates to a high-intensity nickel based wrought superalloy and a preparation method thereof. The high-intensity nickel based wrought superalloy comprises the following main elements in percentage by mass: 10.0-25.0% of Cr, 10.0-20.0% of Co, 0.1-6.0% of Mo, 0.1-6.0% of W, 0.1-6.0% of Al, 0.1-6.0% of Ti, 0.05-1.5% of Nb, 0.1-2.0% of Fe, 0.001-0.10% of C, 0.001-0.05% of B, 0.01-0.1% of Zr, 0.001-0.10% of Ce, 0.001-0.10% of Mg, 0.01%-0.5% of Hf, and the balance Ni and inevitable impurity elements. The preparation method comprises the steps of preparing a high-purity cast ingot by vacuum induction smelting, electroslag remelting and vacuum self-consumption remelting; performing high-temperature diffusion to uniformly anneal the cast ingot under the temperature ranging from 1170-1190 DEG C; heating the annealed cast ion to reach the temperature of 1130-1160 DEG C, maintaining the temperature for 2-4h; then forging the cast ingot into a bar as required through a quick forging press, and thermally processing a bar sample to obtain the alloy material meeting the design demand.

The invention belongs to the field of material surface engineering and more particularly relates to a method for carrying out cladding on a high-hardness wear-resistant anti-corrosion nickel-based alloy material on a metal substrate E in a large area by applying a laser cladding technology, solving the problem of cracks generated in the laser cladding process of the high-hardness wear-resistant nickel-based alloy, in particular the cladding defects, such as cracks with the thickness of more than 1mm, pores and the like during large-area cladding. According to the invention, the high-hardness nickel-based alloy powder material is cladded on the surface of the metal substrate in the large area to form a high-hardness wear-resistant anti-corrosion nickel-based alloy coating by applying the laser cladding technology and adopting a scientific and reasonable process method. According to the method disclosed by the invention, stability and consistency of laser cladding are foundationally ensured, defects, such as cracks, pores, impurities can be prevented from generating, heat affected regions of the substrate are reduced, dilution rate is reduced, the high-wear-resistance anticorrosion nickel-based alloy coating with firm metallurgical bonding and fine and compact grains is obtained and has the hardness reaching 58-63HRC, and the service life of the processed workpiece can be prolonged by more than 1-2 times.

The invention relates to laser melting-covering nickel base nanometer WC/Co precoating manufacturing method. It includes the following steps: weighting lac absolute ethyl alcohol in proportion of 1:10-20; adding the lac into the absolute ethyl alcohol; weighting and mixing nickel base nanometer WC/Co powder and bonding agent in proportion of 1g: 0.1mL-0.25mL; fully stirring to form precoat agent; coating the precoat agent at the workpiece surface to form precoating; drying. The prepared nickel base nanometer WC/Co precoating is adopted laser melting-covering technique to form nickel base nanometer WC/Co composite coating.

The invention relates to an oxidation and corrosion resistant braze alloy consisting of (wt.-%) 10-15% Cr, 4.5-6% Al, 0.17-0.3% Y, 8-12% Co, 0-4% W, 2.5-5% Ta, 2.0-3.5% B with Cr+Al>15%, Cr/Al≦3 and Al+Ta>7.5%, remainder Nickel and unavoidable impurities and to the use of this alloy for brazing onto a Nickel based or a Cobalt based superalloy article. The braze alloy can either be used in pure form as a paste or a foil or as a blend in a blend braze paste, in a braze tape or in a pre-sintered braze sheet.

A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at at least 1200° F. (649° C.) for at least 10 hours. The ingot is electroslag remeelted at a melt rate of at least 8 lbs/min (3.63 kg/mm.), and the ESR ingot is then transferred to a heating furnace within 4 hours of complete solidification and is subjected to a novel post-ESR heat treatment. A suitable VAR electrode is provided form the ESR ingot, and the electrode is vacuum arc remelted at a melt rate of 8 to 11 lbs/minute (3.63 to 5.00 kg/minute) to provide a VAR ingot. The method allows premium quality VAR ingots having diameters greater than 30 inches (762 mm) to be prepared from Alloy 718 and other nickel base superalloys subject to significant segregation on casting.

Disclosed is an amorphous, ductile brazing foil with a composition consisting essentially of Ni_restCr_aB_bP_cSi_d with 2 atomic percent ≦a≦30 atomic percent; 0.5 atomic percent ≦b≦14 atomic percent; 2 atomic percent ≦c≦20 atomic percent; 0 atomic percent ≦d≦14 atomic percent; incidental impurities ≦0.5 atomic percent; rest Ni, where c>b>c/15 and 10 atomic percent ≦b+c+d≦25 atomic percent. Also disclosed is amorphous, ductile Ni-based brazing foil having a composition consisting essentially of Ni_restCr_aB_bP_cSi_dC_eX_fY_g wherein a, b, c, d, e, f, and g are numbers such that 2 atomic percent ≦a≦30 atomic percent; 0.5 atomic percent ≦b≦14 atomic percent; 2 atomic percent ≦c≦20 atomic percent; 0 atomic percent ≦d≦14 atomic percent; 0 atomic percent ≦e≦5 atomic percent; 0 atomic percent ≦f≦5 atomic percent; 0 atomic percent ≦g≦20 atomic percent; wherein incidental impurities are present, if at all, in amounts ≦0.5 atomic percent; wherein rest indicates that the balance of the composition is Ni; wherein c>b>c/15; wherein 10 atomic percent ≦b+c+d≦25 atomic percent, wherein X is one or more of the elements Mo, Nb, Ta, W and Cu; and wherein Y is one or both of the elements Fe and Co. Also disclosed are methods for making and using these brazing foils, and brazed objects produced therefrom.

The invention provides a method for preparing a nickel-base ODS (oxide dispersion strengthened) alloy by injection molding, belonging to the technical field of injection molding of powder. The method comprises the following steps: carrying out high-energy ball milling on the raw material powder so that Y2O3 particles are uniformly dispersed in a nickel substrate, refining mechanical alloy powder by jet milling, and carrying out plasma nodularization on the powder which is refined by jet milling; evenly mixing and smelting the powder, which is refined by jet milling and plasma nodularization, and adhesive to obtain a uniform feed material; and carrying out injection molding, two-step degreasing and sintering on the feed material to obtain a sintered blank of which the density is 93-96%, carrying out hot isostatic compaction on the sintered blank so that the sintered blank is completely compact, and finally, carrying solution heat treatment and aging heat treatment to obtain the injection-molding nickel-base ODS alloy. The nickel-base ODS alloy can be prepared into high-precision parts in complex shapes, thereby solving the problem of difficulty in molding of nickel-base ODS alloy. The gamma' phase and the oxide strengthening mechanism are combined to greatly enhance the high-temperature mechanical properties of the nickel-base ODS alloy.

The invention discloses a metal laser melting additive manufacturing method. After each layer is machined by utilizing the laser additive manufacturing method, a single-layer laser photocoagulation area is modified by utilizing a selective friction stir welding, photocoagulation cracks are eliminated and nanocrystalline is formed. Each additive-manufactured layer is subjected to laser melting and friction stir welding and multiple layers are machined by the method repeatedly, so that nanocrystalline complex metal components with high strength and ductility and no cracks are manufactured. The laser melting additive manufacturing method provided by the invention comprises a selective laser melting technique based on powder bed formation and a laser engineering near-net forming technique based on laser coaxial powder feeding, wherein the involved metal materials comprise an aluminum base, a copper base, a titanium base, an iron base, a nickel base and a cobalt base; the selective friction stir welding can eliminate cracks, balling and holes generated during laser additive manufacturing and improves the formation quality; the selective friction stir welding can crush network carbides in a laser photocoagulation structure, so that the crushed network carbides are distributed in a dispersion manner, and the structure is regulated to be the nanocrystalline.

Embodiments of the present invention relate to nickel-base alloys, and in particular 718-type nickel-base alloys, having a desired microstructure that is predominantly strengthened by γ′-phase precipitates and comprises an amount of at least one grain boundary precipitate. Other embodiments of the present invention relate to methods of heat treating nickel-base alloys, and in particular 718-type nickel-base alloys, to develop a desired microstructure that can impart thermally stable mechanical properties. Articles of manufacture using the nickel-base alloys and methods of heat treating nickel-base alloys according to embodiments of the present invention are also disclosed.

The present invention has an object to reduce residual stress in a tensile direction of a weld on the inner side in contact with reactor water of austenitic stainless steel piping, and to change the residual stress into compressive stress, to reduce stress corrosive cracking. The present invention provides a welding process for stainless steel piping of laminating two types of welding wire made of different materials in a groove of austenitic stainless steel piping, including at least one of a first layer penetration welding step of performing a predetermined back bead width on the back side of the groove bottom and a tack welding step, a first lamination welding step of lamination welding of austenitic stainless steel wire from the bottom to the top of the groove, and a second lamination welding step of lamination welding of nickel-base alloy wire to a final layer at the top of the groove.