39results about How to "Suppressed interdiffusion" patented technology

The invention relates to the coating technique, in particular to an Al/Al2O3/MCrAlY composite coating used in Ti-Al alloy and a preparation method thereof, which aims at improving the high-temperature oxidation resistance of the Ti-Al alloy, guaranteeing the serviceability of the Ti-Al alloy in the high-temperature environment and solving the problem of non-matching between the MCrAlY coating and the Ti-Al alloy and is used for the high-temperature protection of the Ti-Al alloy. The composite coating comprises an Al/Al2O3 diffusion impervious layer and an MCrAlY alloy protective coating which are deposited on a substrate of the alloy in sequence; the thickness ratio among an Al film, an Al2O3 film and the MCrAlY protective coating is (1 to 5): (1 to 5): (20 to 50); in the MCrAlY alloy, M indicates Ni, Co or Ni plus Co. The arc ion plating technique is adopted to deposit the Al/Al2O3 diffusion impervious layer and then the MCrAlY coating on the substrate of the alloy. The composite coating of the invention has good high-temperature oxidation resistance as well as good bonding strength and high-temperature stability and can provide good high-temperature protection to the Ti-Al alloy.

A Ni-based superalloy component includes a bond coat layer having a chemical composition not allowing interdiffusion to occur on a Ni-base superalloy substrate, and by allowing the bond coat layer to have Pt and/or Ir content equal to or higher than 0.2% but not exceeding 15% by mass, generation of an SRZ, which occurs at an interface between the Ni-base superalloy substrate and the bond coat layer in a high-temperature oxidizing atmosphere, can be suppressed, and at the same time adhesion at the interface between a ceramic thermal barrier coat layer and the bond coat layer is improved. Thus, a long-life Ni-based superalloy component with suppressed elemental interdiffusion between the Ni-base superalloy substrate and the bond coat layer even at temperatures exceeding 1100° C. is provided.

The invention discloses a diffusion-resistant high-entropy alloy coating material, a high-temperature-resistant coating material as well as a preparation method and application thereof, and relates tothe technical field of coating preparation. The diffusion-resistant high-entropy alloy coating material comprises a base material and a diffusion-resistant high-entropy alloy coating, wherein elements of the diffusion-resistant high-entropy alloy coating comprise Al, Co, Cr, Ni and Mo. According to the high-temperature-resistant coating material and the preparation method thereof, the diffusion-resistant high-entropy alloy coating is formed on the base material and then serves as a material body to form a high-temperature-resistant coating, the specific slow diffusion effect of the diffusion-resistant high-entropy alloy coating is utilized, and the diffusion-resistant high-entropy alloy coating has good physical and chemical matching performance with the base material and the high-temperature-resistant coating; and mutual diffusion of alloy components between the base material and the coating and precipitation of interface harmful phases can be effectively inhibited, and the high-temperature oxidation resistance of the coating is improved. The high-temperature-resistant coating material can be applied to preparation of hot-end parts of aero-engines or gas turbines, the service life of the parts is prolonged, and the working reliability of the parts is improved.

The invention provides application of a diffusion barrier material, a high-temperature coating and a preparation method and application thereof, and a gas turbine hot end part, and belongs to the technical field of high-temperature protective coatings. The components of the diffusion barrier material include MeSi2, and Me includes Cr or Mo. The diffusion barrier material is compact in crystal structure and good in high-temperature-oxidation-resistant property, and has good thermal expansion compatibility with a base material; the high-temperature coating comprises an outer layer and an inner layer with the diffusion barrier material; the high-temperature coating can inhibit mutual diffusion of alloy components between a base body and the coating, the high-temperature-oxidation-resistant capacity of the coating is improved, meanwhile the situation that the mechanical property of the base body is lowered due to mutual diffusion is avoided, and the service life of parts is prolonged; andthe preparation method of the high-temperature coating is mature and reliable and good in repeatability, and large-area industrial production is easy to implement; and both the diffusion barrier material and the high-temperature coating can be used for machining the gas turbine hot end part, and the gas turbine hot end part containing the diffusion barrier material or the high-temperature coatinghas the long service life and high working reliability.

This invention relates to a 1.3mum InAs/GaAs quantum dot laser without Al including a chip, a buffer layer processed on the chip, a lower cladding made on the buffer layer, a lower waveguide layer set on the lower cladding, a quantum dot active region set on the lower waveguide layer, an upper waveguide layer prepared on the active region of the quantum dot, an upper cladding prepared on the upper waveguide layer under low temperature, a contact layer prepared on the upper cladding. Since high quality of the InGaP can be got under low growing temperature, the blue shift of the quantum dots is controlled effectively in the growing process of the cladding.

The invention discloses a lanthanum-iron-silicon/gadolinium composite magnetic refrigeration material and a preparation technology thereof and belongs to the field of magnetic refrigeration materialsin magnetic functional materials. A La-Fe-Si/Gd composite magnetic refrigeration material with high strength and high performance is obtained by adopting metal Gd particles as a second magnetic refrigeration material of playing a bonding role and La-Fe-Si series alloy through hot pressing sintering. The invention further discloses a preparation method and application of the La-Fe-Si/Gd composite magnetic refrigeration material. The La-Fe-Si series alloy and Gd are magnetic refrigeration materials with excellent performance, so that the mechanical properties are complementary. Through additionof Gd elemental particles, the mechanical property of the La-Fe-Si series alloy is greatly strengthened, and furthermore, the damage to the magnetic refrigeration performance caused by use of other binders is avoided. The obtained magnet has good magnetic refrigeration performance and relatively high strength, is simple in equipment, simple in operation and relatively low in cost in an implementation process, is high in economic value and has important application significance in the field of magnetic refrigeration, and mass production is easy to implement.

The invention relates to the high temperature coating technology, and in particular relates to a high temperature coating containing zirconium oxide active diffusing barrier and a preparation method thereof. The high temperature protective coating comprises a zirconium oxide active diffusing inner layer and an anti-high temperature oxidizing protective layer. The zirconium oxide inner layer can be spontaneously converted into a multilayer film structure comprising aluminum oxide/metal/ aluminum oxide in the using process, so that mutual diffusion between the anti-high temperature oxidizing protective layer and a base body can be resisted, and the coating has good binding strength and thermal stability, so that effective antioxidant components in the anti-high temperature oxidizing protective layer are prevented from diffusing to the base body, and therefore, the service life of the high temperature coating is prolonged, and the mechanical performance of the base body is not damaged. The preparation method comprises the following steps of: first, preparing a zirconium oxide layer on the surface of the base body by an electron beam physical vapor deposition method; and then, preparing the anti-high temperature oxidizing protective layer on the active diffusing barrier by one of a vacuum physical vapor deposition method, a chemical vapor deposition method, a thermal spraying method and the like or combination thereof.

The invention discloses a composite metal ceramic coating for high-temperature alloy protection and a preparing method of the composite metal ceramic coating. The coating comprises a face layer and abottom layer with a nano columnar crystal structure. The face layer comprises at least two metal ceramic sub layers, and a metal parent phase and a dispersed distribution nitride ceramic phase are specifically included. In the direction from the surface of the composite metal ceramic coating to an alloy matrix, the doping amount of the nitride ceramic phase is gradually reduced, and the distribution interval of the volume fraction of the nitride ceramic phase is 0.1-60%. According to the preparing method of the coating, magnetic control sputtering is adopted for preparing a bottom layer coating, and then, non-balance reaction magnetic control sputtering is utilized for preparing the face layer of the doped ceramic phase. Through the structure, the heat expansion coefficient of the coatingis gradually increased from top to bottom, jumping changes of the heat expansion coefficient on the coating/oxide film interface are reduced, accordingly, the heat stress in an oxide film in the heatcirculation process is relieved, and the capability of oxide film peeling resisting of the coating in the heat circulation is enhanced.

The invention provides a multi-layer ceramic-based composite thermal protection coating and a preparation method and an application thereof, and the multi-layer composite thermal protection coating is prepared by a combined process of preparing three layers by a chemical vapor deposition method and preparing two layers by a brushing sintering method, and the coating sequentially comprises a buffer layer, a high-strength self-healing anti-oxidation layer, a middle chemical barrier layer, a ceramic thermal insulation layer and a reinforced isolation layer from inside to outside. The inner buffer layer, the middle chemical barrier layer and the outer reinforced isolation layer are all made of chemical vapor deposition silicon carbide; the strong self-healing anti-oxidation layer of the secondary inner layer is made of silicon powder/zirconium silicide/silicon hexaboride multiphase ceramic; and the material of the ceramic thermal insulation layer on the secondary outer layer is silicon powder/lanthanum hexaboride/mullite/zirconium boride multiphase ceramic. The composite material has excellent thermal protection performance such as oxidation resistance, corrosion resistance and thermal shock resistance, the service life of the material under high-temperature chemical oxidation and corrosion conditions can be remarkably prolonged, and the ceramic-based or carbon-based composite material keeps stable comprehensive performance after being recycled for multiple weeks in the high-temperature environment of 1,500 K or above.

The invention relates to the field of laser additive manufacturing, in particular to an additive manufacturing method for heterogeneous steel pipe joints. The direct welding and manufacturing of existing heterogeneous steel pipe joints have problems such as low weld fusion surface strength, cracks in welded joints and heat affected zones, and performance degradation after long-term service. According to the additive manufacturing method for heterogeneous steel pipe joints, by adoption of the laser-coaxial powder feeding additive manufacturing technology, spherical powders of two alloys A and Bare put into two powder feeders; and the powder feeding ratio and the laser power are continuously changed during the melting process to change chemical components in a micro-zone of a molten pool, so that heterogeneous steel pipe joints with the chemical components transitioning from A to B in order are formed; the difference in physical properties, such as the expansion coefficient, of the twosides of the heterogeneous steel pipe joints is reduced; the thermal stress under high temperature and high pressure is greatly reduced; the chemical component concentration gradient on both sides ofthe heterogeneous steel pipe joints is also reduced; the interdiffusion of the alloys A and B can be inhibited; high temperature properties are improved, and the and service life is prolonged; and themethod has significant safety and economic benefits.

The invention relates to a positive electrode material for improving the interface stability of sulfide electrolyte and application, wherein the chemical general formula of the positive electrode material is Li1-zZzNiaMnbM1cM2dM3eSxO4-x, z is more than or equal to 0 and less than 1, a is more than 0 and less than or equal to 0.5, b is more than 0 and less than or equal to1.5, c is more than or equal to 0 and less than2, d is more than or equal to 0 and less than or equal to 2, e is more than or equal to 0 and less than or equal to 2, x is more than or equal to 0.01 and less than0.65, a + b + c + d + e is equal to 2, Z is a positive ion doped at a Li site, the valence state of Z is +1 valence, M1, M2 and M3 are respectively positive ions doped at transition metal sites, and S is a sulfur element. According to the invention, the doping of the anion S can effectively inhibit the serious space charge layer effect and element mutual diffusion between the sulfurized electrolyte and the layered oxide positive electrode material, and reduce the interface electrochemical side reaction so as to improve the capacity, reducing the interface impedance and optimize the electrochemical performance of the material.

The invention discloses a high temperature corrosion and ablation-resistant coating on the surface of a gamma-TiAl-based alloy and a preparation method thereof and belongs to the technical field of protective coatings. The coating is a TiAlSiN or CrAlSiN coating which is prepared by means of a vacuum physical vapor deposition method. A continuous Al2O3 layer can be formed in an oxidization film onthe surface of the coating in a high-temperature thermal exposure process of the coating, so that the coating has relatively good high-temperature oxidization resistance and ablation resistance. Moreover, the coating and a gamma-TiAl-based alloy interface can generate a diffusive barrier layer such as Ti5Si3 in situ at a high temperature, so that counterdiffusion between the coating and the alloyis quite slight and the service life of the coating is prolonged greatly.

The invention discloses a preparation method of a high-nickel ternary positive electrode material with a transition metal element concentration gradient. The preparation method is characterized by comprising the following steps of: firstly, carrying out high-speed mechanical fusion on a precursor with a core-shell structure or an element concentration gradient structure and an additive, then mixing with lithium hydroxide, and preparing the high-nickel ternary positive electrode material with transition metal element concentration gradient distribution by controlling particle growth and elementdiffusion in a roasting process. Parameters in the roasting process are optimized, and the purposes of inhibiting abnormal growth of primary particles, inhibiting mutual diffusion of transition metalelements and the like are achieved.

The invention belongs to a molten salt corrosion resistant protective coating technology, and particularly relates to a molten salt corrosion resistant coating containing a nickel-tantalum active diffusion barrier layer and a preparation method. A high-temperature corrosion-resistant coating on a matrix comprises a nickel-tantalum inner layer and a pure nickel molten salt corrosion-resistant outer layer; and the nickel-tantalum diffusion barrier layer can react with alloy elements to form an intermetallic compound in a use process, can hinder mutual diffusion between the pure nickel outer layer and the matrix, and has good bonding strength. By means of the method for inhibiting mutual diffusion of alloy elements between the coating and the matrix; the service life of the coating can be prolonged; and the mechanical property of the matrix is not damaged. The preparation method comprises the following steps: firstly, preparing the nickel-tantalum layer on the surface of the matrix by using a physical vapor deposition (PVD) method; and then preparing the pure nickel molten salt corrosion resistant protective outer layer by using one or a combination of an electrodeposition preparation method, a physical vapor deposition preparation method and a chemical plating coating preparation method.

The invention discloses a method for prolonging the service life of a thermal barrier coating based on a platinum-aluminum bonding layer, and belongs to the technical field of high-temperature protective coatings. Through a pre-oxidation method, a layer of TGO oxidation film is prepared on the surface of a platinum-aluminum coating in advance to serve as a bottom bonding layer of a TBC coating. The platinum-aluminum coating bonding layer is bonded with a TBCs thermal barrier coating top layer YSZ mainly depending on an oxide film TGO generated on the surface, the thickness increase of the TGO oxide film is in a parabolic growth mode due to the diffusion rate of O and Al atoms, and when the TGO cracks and falls off due to stress concentration generated by the thickness increase of the TGO, the TBC coating loses efficacy. Due to the fact that a layer of compact oxidation film TGO can be generated on the surface of the platinum-aluminum bonding layer in advance through a low-pressure pre-oxidation technology, the growth speed of the TGO is slowed down, and the service life of the TBCs thermal barrier coating can be prolonged.

The invention discloses a thermal barrier coating for inhibiting matrix/thermal barrier coating bonding layer element mutual diffusion, which comprises an MCrAlY metal bonding layer and a ZrO2-6-8Y2O3 ceramic layer which are sequentially arranged on a matrix from inside to outside, and M is Ni or Co or Ni + Co; the metal bonding layer is composed of a bottom bonding layer and a top bonding layer, the components of the bottom bonding layer are completely the same as the components of the matrix, and the elements have no concentration gradient; the top bonding layer is MCrAlY, and the content of Al and Cr elements is higher than that of a base body. According to the thermal barrier coating, mutual diffusion of bonding layer/matrix elements in a traditional coating is effectively avoided, the production process is simple, efficiency is high, performance is excellent and stable, and the thermal barrier coating is suitable for being applied to hot end components of aero-engines and gas turbines on a large scale.