17 results about "Aluminide" patented technology

The invention relates to the field of suspension plasma spraying, in particular to a long-service-life suspension plasma spraying thermal barrier coating based on a platinum-aluminum coating and a preparation method of the long-service-life suspension plasma spraying thermal barrier coating. The preparation method comprises the following steps: preparing a vertical crack or columnar-like structure ceramic layer on the surface of a platinum modified aluminide bonding layer with lower roughness by using suspension slurry prepared from fully-stable tetragonal phase yttrium oxide stabilized zirconium oxide powder and adopting suspension plasma spraying suspension, so as to obtain a thermal barrier coating system with long service life. The problems that in the prior art, due to stress existing between a ceramic layer prepared through plasma spraying and a low-roughness platinum modified aluminide bonding layer, cracks are continuously formed and expanded at an interface, and the service life of a thermal barrier coating system is short are solved. The long-life thermal barrier coating system can be prepared on the platinum modified aluminide bonding layer through suspension plasma spraying.

The application discloses a preparation method of a binary transition metal aluminide nanocatalyst and application thereof. First, a mixed metal salt solution is mixed with an ammonium carbonate solution to obtain a metal oxide precursor through co-precipitation. Then, the oxide precursor is mixed with a low-temperature composite molten salt and is subjected to thermal reduction under a specific atmosphere. Through simple post-processing, a single-phase binary transition metal aluminide nanocatalyst with high catalytic activity is obtained. The non-noble metal aluminide nanocatalyst prepared is applied to a reaction of catalytically selectively hydrogenating acetylenes to prepare olefin compounds. Under mild conditions, 99% conversion of reactants is achieved while maintaining 96% olefin selectivity. Compared with a traditional supported catalyst, the metal aluminum atom greatly regulates the electronic and geometric structures of the transition metal atom, effectively improves the catalytic activity, and significantly improves the structural stability of the catalyst. The material has high phase purity, is easy to separate and recycle, and has good application prospect.

This invention relates to a method for preparing a layered composite material, comprising the following steps: S1, pretreating the surfaces of an aluminum plate and a dissimilar metal plate; S2, coating the surfaces of the aluminum plate and the dissimilar metal plate treated in S1 with a paste-like aluminum flux, wherein the melting point and minimum activity temperature of the aluminum flux are both lower than the diffusion reaction temperature of the aluminum plate and the dissimilar metal plate; S3, alternately stacking the aluminum plate and the dissimilar metal plate treated in S2 to form a stack, wherein aluminum flux is present between adjacent aluminum plates and dissimilar metal plates, and subjecting the stack to vacuum heating surface treatment; S4, subjecting the stack treated in S3 to further vacuum hot-press diffusion treatment, thereby obtaining an aluminum flux-assisted metal / aluminide layered composite material. This method significantly improves the diffusion reaction rate and reduces the probability of Kirkendal voids; it avoids the "centerline" defect that easily forms in the original technology, which leads to incomplete conversion of the aluminum layer into aluminides, allowing the layered composite material to be used under conditions higher than the melting point of aluminum.

The invention relates to the technical field of chemical vapor deposition, and discloses a supply device for controlling aluminide airflow and a use method, and a positioning sheet is matched with a fixed bracket, so that the device can be conveniently and quickly clamped, and the demand of large-scale engineering production is met. The gas flow distributor can equally divide the process gas, the gas outlet hole of the gas flow distributor accurately corresponds to the turbine blade cavity, the laminar flow phenomenon is effectively improved, and accurate supply and flow direction control of the process gas are achieved. The turbine blade is fully wrapped by the gas collection box, and the exhaust holes are formed in the lower portion of the gas collection box, so that process gas circulates in the gas collection box, the gas can be guided to fully infiltrate all the surfaces of the blade and complex blind cavity parts, and the uniformity of codeposition of an aluminide coating is guaranteed. The whole structural design is matched with the technological characteristics of CVA440BL-T type CVD equipment, deformation is small in the long-term high-temperature and strong-corrosion environment, stability and consistency in the deposition process are maintained, and the problem of deposition of coatings on the surfaces of complex inner cavities and flow channels of turbine blades is effectively solved.

The application belongs to the field of catalytic new materials and fine chemical technology, and discloses a preparation method and application of a supported noble metal aluminide nanocatalyst. The application provides a new preparation method and catalyst, and can synthesize a supported noble metal aluminide catalytic material with high activity and high selectivity at a lower temperature, which is used for selective hydrogenation reaction. In particular, the application aims to solve the problems of difficult preparation, easy phase mixing, and insufficient selectivity and stability in hydrogenation reaction of the high-activity supported noble metal aluminide nanocatalyst, thereby significantly improving the catalytic effect. The supported noble metal aluminide nanocatalyst prepared by the application can obtain the performance even better than that of a conventional noble metal catalyst at a lower reaction temperature and pressure, the reaction path is clear, the metal ratio range is adjustable, the synthesis result has high repeatability, and the application provides a new high-efficiency and stable catalytic material for selective hydrogenation.

Provided are methods to convert—through a bottom-up approach—binary and ternary titanium carbides, nitrides, borides, phosphides, aluminides, and silicides into lepidocrocitic nanofilaments that in some cases self-assemble into 2D flakes by immersing them in a quaternary ammonium solution at moderate temperatures. The resulting flakes can be C-containing layers that are in turn comprised of nanofilaments in cross-section, some of which nanofilaments can be few microns long in some instances.

A method for coating a component having: a metallic substrate; a ceramic coating having one or more ceramic coating layers atop the substrate; and a cooling passageway system comprising a plurality of feed passageways extending from one or more inlet ports and a plurality of outlet passageways. The outlet passageways have openings in the coating. The method involves: applying a slurry aluminide to the plurality of outlet passageways; coupling the one or more inlets to a suction source; applying an external gas flow to the component, the suction source drawing the external gas in through the outlet passageways and out through the one or more inlet ports, the external gas flow comprising at least 50% by volume combined one to all of Ar, He, and H2; and while the suction source is drawing the external gas, heating the component to aluminize the cooling passageway system.

A method for manufacturing an anti-oxidation coating for titanium alloys includes the following steps: providing a titanium alloy part and cleaning its surface; depositing a Ni / Re or Ta diffusion barrier layer on the surface of the titanium alloy part; and depositing an MCrAlY protective layer or an aluminide protective layer on the surface of the titanium alloy part using a vapor deposition process, wherein M is Ni or NiCo. The anti-oxidation coating for titanium alloys prepared by this method exhibits excellent high-temperature oxidation resistance and can inhibit interdiffusion between the coating and the titanium alloy substrate, thereby improving the bonding strength of the coating. This invention also provides an anti-oxidation coating for titanium alloys.

Turbine assembly with inter-sector sealing. A turbine assembly comprises a plurality of adjacent sectors (40), each sector comprising at least one connecting edge of ceramic matrix composite material (42, 43), each connecting edge having at least one groove or recess (420, 421, 422) and at least one sealing tab (150, 151, 152) present in each groove or recess. Each sealing tab comprises at least one substrate of metallic material, the external surface of which is covered by an outer coating. The outer coating comprises at least one layer of a material selected from one of the following: alumina, nitride, oxide ceramic, aluminoforming alloy, and aluminide. Figures for the abstract: Fig. 4.

The invention relates to the technical field of chemical vapor deposition equipment, and discloses a multi-station chemical vapor deposition metal cementation device which is characterized in that a tool main body is matched with a high-temperature reactor of the chemical vapor deposition equipment, and a plurality of clamping stations are matched through division of a plurality of layers of trays and a fan-shaped area, so that the maximum layout of the clamping stations is realized, and the working efficiency is improved. And the large-scale engineering production requirement is met, turbine blades of different models can be adapted, and good universality is achieved. The gas flow adjusting distributors are matched with the gas guide holes of the clamping stations, so that process gas can be effectively restrained to uniformly flow to the clamping stations, the industrial problems of uniform distribution and accurate distribution of the process gas in the large-volume high-temperature reactor are successfully solved, and uniform coating of aluminide infiltrated layers of blades of the stations is guaranteed. Meanwhile, the tool structure design of the adaptive equipment can adapt to a high-temperature and strong-corrosion process environment, deformation in long-term use is reduced, the requirement of the process for the stability of the device is met, the layout of all parts is reasonable, and rapid and efficient clamping is achieved in an assisting mode.

The application provides a design and a preparation method of Ni3Al-based high-entropy aluminide with excellent strength-plasticity synergy, and relates to the technical field of component selection and preparation of advanced metal structural materials. The design needs to meet certain parameter criteria, which mainly include the enthalpy-entropy ratio based on a pseudo-binary sublattice model, atomic size difference: d0, electronegativity difference: Delta N, valence electron concentration deviation: Delta e, and total valence electron concentration: e0. Through component design, smelting and casting and cold deformation treatment, the controllable preparation of the Ni3Al-based high-entropy aluminide is realized, and the Ni3Al-based high-entropy aluminide has excellent performance, simple preparation process and low cost, and is suitable for large-scale industrial production.

This invention relates to a lightweight, ablation-resistant tungsten-aluminate-infiltrated dissipative heat-resistant composite material for throat liners and its preparation method. The aim is to address the problems of high density and susceptibility to oxidation and ablation in existing rocket engine throat liner materials, leading to low reliability. This invention utilizes an aluminum alloy as the dissipative agent. The low melting point and high volatility of aluminum alloy allow it to quickly dissipate a large amount of heat, reducing the material's surface temperature. The aluminum alloy dissipative agent forms a melt that acts as a reducing agent, reacting to form a dense, high-temperature-resistant alumina layer. This layer provides excellent thermal insulation and oxidation resistance, preventing oxidation and ablation at high temperatures that reduce grain boundary strength and consequently lower the overall material strength.

A nickel-based alloy is coated with a silicate based nickel aluminide slurry diffusion coating.

The application provides a method for preparing a diffusion type aluminide compound coating by multi-component chemical vapor deposition, relates to the technical field of high-temperature protective coating preparation, and can realize co-deposition of multiple active elements or alloying elements and aluminum elements and accurate control of a deposition content; the application can realize control of different reaction temperatures and reaction pressures; the application can realize co-deposition of active elements at different aluminizing times, and co-deposition can occur at the beginning, middle or end of reaction according to different process parameters; and the coating prepared by the application is uniform in composition and has few internal defects.

The application provides a modification method for improving the oxidation resistance of an aluminide cladding coating, and comprises the following steps: stirring, ball milling, and drying 50-80% of NiAl, 10-40% of Al, 1-5% of Pd, 2-5% of Ti, and 2-5% of NH4Cl according to the mass percentage of solid phase components to prepare cladding powder; wherein the sum of the mass percentages of the solid phase components is 100%; performing surface cleaning treatment on a workpiece to be plated for standby, pouring sufficient cladding powder into a feeding port of an ion cladding device; placing the workpiece to be plated in an inert atmosphere, spraying the cladding powder on the surface of the workpiece to be plated by using the ion cladding device to perform plasma cladding, and obtaining an aluminide cladding coating after cooling; and performing treatment on cladding residues. One technical effect of the application is that the design is reasonable, and the oxidation resistance of the aluminide cladding coating is improved.

The invention relates to the technical field of chemical vapor deposition, and discloses an ultra-high-temperature anti-seepage coating and a preparation method thereof, and the ultra-high-temperature anti-seepage coating adopts a bottom layer and surface layer double-layer slurry design, and is matched with a specific solid powder and liquid binder combination. A film layer formed by the alpha alumina powder on the bottom layer and the liquid binder can be used as basic protection, and a mixed system of the alpha alumina powder on the surface layer and the nickel powder has a synergistic effect and is combined with the binder prepared from polyvinyl butyral and absolute ethyl alcohol, so that a continuous and compact double-layer protection structure can be formed; and the high-temperature resistance can meet the preparation requirements of the aluminide infiltrated layers of DD5 and DD6 single crystal turbine blades at the temperature of 1030-1055 DEG C. Chloride MCl atmosphere can be effectively isolated, harmful reaction with matrix metal is avoided, cracking, stripping or pulverization is not prone to occurring in the high-temperature metal cementation process, after cooling, bonding with a matrix is avoided, cleaning is easy, the precision size of a part is not affected, reliable anti-seepage guarantee is provided for local preparation of a single-crystal turbine blade aluminide coating, and the service life of the single-crystal turbine blade aluminide coating is prolonged. The high-temperature-resistant limitation of the existing anti-seepage technology is broken through.

A nickel-based alloy is coated with a silicate based nickel aluminide slurry diffusion coating.