39results about How to "Suppressed interdiffusion" patented technology

The invention discloses a method for preparing a high-performance double-main-phase sintered mixed rare earth iron boron magnet through a two-step diffusion method, and belongs to the technical fieldof rare earth magnetic material preparation. Components of two main-phase alloys are RE-Fe-B (RE is Nd or Pr) and (Nd, MM)-Fe-B respectively, MM being mixed rare earth. The method is characterized inthat, to begin with, with a PrHoFe alloy quick-setting sheet serving as a diffusion source, the surfaces of (Nd, MM)-Fe-B hydrogen decrepitation powder particles are uniformly coated with a layer PrHo-rich compound, thereby improving the coercive force by utilizing higher anisotropic fields of Pr2Fe14B and Ho2Fe14B; and then, with a ZrCu alloy quick-setting sheet serving as the diffusion source, the surfaces of the powder particles subjected to the first-step diffusion are evenly coated with a Zr-rich layer to prevent growth of MM-containing main phase grains and suppress mutual diffusion withthe other main phase in the two main phases in the sintering process, thereby obtaining high coercive force.

The invention discloses a diffusion-resistant high-entropy alloy coating material, a high-temperature-resistant coating material, a preparation method and an application thereof, and relates to the technical field of coating preparation. The diffusion-resistant high-entropy alloy coating material includes a base material and a diffusion-resistant high-entropy alloy coating, and the elements of the diffusion-resistant high-entropy alloy coating include Al, Co, Cr, Ni and Mo. The high-temperature-resistant coating material and its preparation method form the above-mentioned diffusion-resistant high-entropy alloy coating on the substrate, and then use this as the material body to form a high-temperature-resistant coating, and utilize the unique slow diffusion effect of the diffusion-resistant high-entropy alloy coating. And it has good physical and chemical matching with the substrate and the high-temperature resistant coating, which can effectively inhibit the interdiffusion of alloy components between the substrate and the coating and the precipitation of harmful phases at the interface, and improve the high-temperature oxidation resistance of the coating. The high-temperature-resistant coating material can be applied in the preparation of hot-end parts of aero-engines or gas turbines, thereby improving the service life and working reliability of the parts.

The invention relates to a positive electrode material and application for improving the interface stability of a sulfide electrolyte. The general chemical formula of the cathode material is: Li 1‑z Z z Ni a mn b M1 c M2 d M3 e S x o 4‑x ; where 0≤z<1, 0<a≤0.5, 0<b≤1.5, 0≤c<2, 0≤d≤2, 0≤e≤2, 0.01≤x<0.65, a+b+c+ d+e=2; wherein, Z is a cation doped with a Li site, and the valence is +1; M1, M2, and M3 are respectively cations doped with a transition metal site; S is sulfur. The doping of anion S can effectively suppress the serious space charge layer effect and interdiffusion of elements between the sulfurized electrolyte and the layered oxide cathode material, reduce the electrochemical side reaction at the interface, thereby increasing the capacity, reducing the interface impedance, and optimizing the electrical conductivity of the material. chemical properties.

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 an ultraviolet semiconductor light emitting device and a manufacturing method thereof. The device comprises an epitaxial layer composed of an n-type layer, a quantum well layer and a p-type layer, a p-type electrode and an n-type electrode. The p-type layer is further provided with a graphene-Ag nanocomposite layer and a conductive reflecting layer sequentially, and the graphene-Ag nanocomposite layer and the p-type layer are in ohmic contact. Furthermore, the graphene-Ag nanocomposite layer includes an Ag nano material layer formed on the p-type layer, and the Ag nano material layer comprises Ag nano points and / or Ag nano lines and a graphene film covering the Ag nano material layer; or, graphene quantum points load an Ag nanoparticle composite layer. The device has the advantages of high external quantum efficiency, high light emitting efficiency, low start voltage, fine heat radiation and high stability, the manufacturing process is simple and controllable, cost is low, and the device is adaptive to industrial production.

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 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.

A method for preparing a high-nickel ternary positive electrode material with a transition metal element concentration gradient, characterized in that the preparation method first performs high-speed mechanical fusion of a precursor with a core-shell structure or an element concentration gradient structure and an additive, and then oxidizes it with hydrogen Lithium is mixed, and a high-nickel ternary positive electrode material with a gradient distribution of transition metal elements is prepared by controlling particle growth and element diffusion during the calcination process. The parameters in the roasting process are optimized to achieve the purpose of suppressing the abnormal growth of primary particles and interdiffusion of transition metal elements.

The invention relates to a rare-earth-based T / EBC ceramic matrix composite environmental barrier coating and a preparation method thereof. A ceramic matrix is made of a silicon carbide fiber reinforcement silicon carbide ceramic matrix composite material, the environmental barrier coating sequentially comprises a water oxygen corrosion resistant layer, a chemical barrier layer, an energy dissipation layer and a thermal protecting and shielding layer from inside to outside, and the water oxygen corrosion resistant layer is prepared on the surface of the ceramic matrix, wherein materials of the water oxygen corrosion resistant layer comprise mullite and lutetium orthosilicate; a material of the chemical barrier layer comprises zirconium nitride; a material of the energy dissipation layer comprises yttrium aluminum garnet; a material of the thermal protecting and shielding layer comprises lanthanum zirconate. The ceramic matrix composite environmental barrier coating has excellent comprehensive performance, the interfacial strength, fracture toughness and hardness of the coating can be improved, the service life of the coating is significantly prolonged, the thermal conductivity of the coating is reduced, and therefore the Sicf / Sic ceramic matrix can keep stable in comprehensive performance after recycling utilization for multiple circles under the high-temperature environment of 1900 k or above.