20results about How to "Improve interface structure" patented technology

The invention relates to the technical field of wear-resistant composite materials, and particularly provides a modification method of ceramic particles, a ceramic-reinforced high-chromium iron-based composite material and a preparation method of the ceramic-reinforced high-chromium iron-based composite material, and the modification method comprises the following steps: carrying out decontamination, hydrofluoric acid coarsening, divalent tin sensitization, metal palladium activation, chemical Ni plating, ceramic micro powder coating and other treatments on SiC or ZTA and other ceramic particles; therefore, metallization modification can be rapidly achieved on the surfaces of the ceramic particles, decomposition of the ceramic particles is prevented, the connection strength between the ceramic particles and the metal-based material is effectively improved, and the ceramic reinforced high-chromium iron-based composite material with high hardness and high abrasion resistance is prepared. And technical support is provided for developing wear-resistant parts of mechanical equipment under harsh working conditions of metallurgy, mines, coal, building materials and the like.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a graphite composite material and a preparation method and application thereof. The preparation method comprises the following steps: heating metal lithium to obtain lithium steam, and depositing the lithium steam into a metal organic framework material to obtain a lithium-doped metal organic framework material; a chemical vapor deposition method is adopted, carbon source gas and oxygen are introduced, amorphous carbon is deposited in the lithium-doped metal organic framework material, and an amorphous carbon and lithium co-doped metal organic framework material is obtained; and mixing the amorphous carbon and lithium co-doped metal organic framework material, a metal salt solution and a graphite material to obtain a mixture, heating, carrying out solid-liquid separation, taking solid components, introducing carbon source gas, and reacting to generate carbon nanotubes, thereby obtaining the graphite composite material. When the prepared graphite composite material is applied to a lithium ion battery as a negative electrode material, the battery has the advantages of high first efficiency, good liquid retention performance, low expansion, fast charge, good cycle performance and the like.

The invention discloses a preparation method of a PANI-ZIF-8 / PA composite coating on the surface of a metal bipolar plate, and the preparation method comprises the following steps: firstly, placing the pretreated metal bipolar plate in a mixed solution, obtaining a conductive polymer PANI bottom layer through a constant current deposition method, then dispersing ZIF-8 and PA in deionized water to obtain a ZIF-8 / PA coating, and finally, preparing the PANI-ZIF-8 / PA composite coating on the surface of the metal bipolar plate. Then, the PANI coating is coated with the ZIF-8 / PA coating in a spinning mode, and a PANI-ZIF-8 / PA composite coating is formed; the adhesive force of the PANI bottom layer on the metal bipolar plate is improved through the electro-deposition technology, the corrosion resistance of the PANI-ZIF-8 / PA composite coating is improved through the surface ZIF-8 / PA coating, and the PANI-ZIF-8 / PA composite coating has good application prospects in the fields of proton exchange membrane fuel cells and proton exchange membrane water electrolysis hydrogen production.

The present invention discloses a SiC heterojunction transistor epitaxial structure and a device. The SiC heterojunction transistor epitaxial structure comprises, from bottom to top, a C-face 4H-SiC substrate, a 4H-SiC epitaxial layer, and an N-type 3C-SiC epitaxial layer. In the structure, the heterojunction formed by 3C-SiC and 4H-SiC has negligible thermal matching and lattice matching. 3C-SiC and 4H-SiC have a lattice matching structure. <0001> The lattice mismatch of the surface is less than 0.1%, which has a better interface structure.

The invention discloses a modified calcium oxide expansive grouting material, the raw materials of which include: cement, calcium oxide expansive agent, water-based polyurethane, early strength agent, defoamer, water reducer and water; the mass ratio of cement, calcium oxide expansive agent, water-based polyurethane, early strength agent, defoamer, water reducer and water is 1000:30-90:8-12:50-70:2-4:10-14:500. The raw materials also include: limestone, silica powder, fly ash, sodium alginate, graphene oxide, microbial preparation, urea, calcium lactate; the mass ratio of limestone, silica powder, fly ash, sodium alginate, graphene oxide, microbial preparation, urea, calcium lactate and cement is 20-40:1-3:5-15:1-2:1-3:1-2:1-3:1-2:1000. The invention also discloses a preparation method and application of the modified calcium oxide expansive grouting material.

The invention discloses an application of an anti-corrosion and anti-seepage agent in a phosphate radical and fluorine ion environment, which is characterized in that the anti-corrosion and anti-seepage agent is added into concrete according to 0.5-3% of a cementing material to prepare a required structure for resisting corrosion of phosphate radicals and fluorine ions. A concrete test piece added with the anti-corrosion and anti-seepage agent is in a phosphorus-fluorine acid environment for a long time, the compressive strength of the concrete test piece is still in an enhanced trend, the addition of the anti-corrosion and anti-seepage agent has the effect of resisting corrosion of phosphate radical and fluorine ion environment acid wastewater, and a concrete structure can still be very stable even in a strong acid environment; the high efficiency can provide a feasible solution for prolonging the service life of highly acidic environment structures such as ardealite storehouses and the like.

The embodiment of the invention relates to the technical field of solar cells, and provides a perovskite solar cell and a preparation method thereof. The perovskite solar cell comprises a conductive substrate; a hole transport layer laminated on the upper surface of the conductive substrate; wherein the hole transport layer is made of nickel oxide; a composite layer laminated on the upper surface of the hole transport layer; the material of the composite layer comprises an SAM material and a conductive polymer; and the perovskite light absorption layer is laminated on the upper surface of the composite layer. According to the invention, the composite layer is arranged between the hole transport layer and the perovskite light absorption layer, so that direct contact between nickel oxide in the hole transport layer and the perovskite light absorption layer is effectively blocked, and non-radiative recombination loss caused by an oxidation-reduction reaction at an interface between the nickel oxide and the perovskite light absorption layer is inhibited, thereby improving the interface stability of the perovskite cell, and improving the performance of the perovskite cell. Therefore, the photoelectric conversion efficiency and the long-term stability of the device are enhanced.

The invention discloses a method for preparing asphalt concrete by using surface modified ceramsite, and belongs to the field of composite materials. The ceramsite is modified by the oleic acid / coupling agent, and then the ceramsite is used for preparing the asphalt concrete. According to the method disclosed by the invention, tight combination of the ceramsite and the asphalt concrete is realized, so that the adhesion and the water damage property of the asphalt mixture are improved. The ceramsite modification process of the method is simple and controllable, industrial production can be performed after simple modification, and the obtained asphalt concrete treated by the oleic acid / coupling agent has the advantages of light weight, good mechanical properties, aging resistance, heat preservation, heat resistance and noise reduction, and has wide application potential in the fields of bridges, high-quality roads, environmental protection and the like. The method is low in process requirement, simple, easy to implement and suitable for large-scale engineering application.

The invention discloses a sound-absorbing and sound-insulating halogen-free flame-retardant polypropylene material and a preparation method thereof, and belongs to the technical field of high polymer materials. The sound-absorbing and sound-insulating halogen-free flame-retardant polypropylene material is prepared from the following raw materials in parts by mass: 35 to 55 parts of polypropylene resin, 5 to 35 parts of hollow glass beads, 2 to 10 parts of a compatilizer, 20 to 24 parts of a halogen-free flame retardant, 0.1 to 0.4 part of a main oxidant, 0.2 to 0.8 part of an auxiliary antioxidant, 0.1 to 0.4 part of a lubricant and 0.1 to 0.2 part of an anti-dripping agent. The material has excellent flame retardant property, high strength, good mechanical property and sound absorption and sound insulation functions, and a product can be applied to the fields of household appliances, electronic appliances and automobiles, is particularly suitable for flame retardant structural parts of various small household appliances, such as pump shells, motor outer covers and other parts, and has a wide application prospect.

The invention belongs to the technical field of alloy materials, and particularly relates to a method for improving the performance of a polymer alloy material and the polymer alloy material. The polymer alloy material is prepared from the following raw materials: polycarbonate resin, polyethylene glycol terephthalate, a compatibilizing and toughening agent, functionalized carbon nanotubes, an ester exchange inhibitor and other processing aids. The method for improving the performance of the polymer alloy material comprises the following steps: uniformly mixing polycarbonate resin, polyethylene glycol terephthalate, a compatibilizing and toughening agent, a functionalized carbon nanotube, an ester exchange inhibitor and other processing aids, and then carrying out melt blending extrusion in an extruder; and cooling and pelletizing the extruded alloy material to prepare the polymer alloy material. The comprehensive performance of the alloy material is remarkably improved, and the problem that the mechanical performance of a traditional material is unbalanced is solved.

The application belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method, application and a lithium ion battery, wherein the preparation method comprises the following steps: mixing silicon powder, graphite and a composite functional additive, and then performing ball milling modification after slurry treatment to obtain primary composite particles; the composite functional additive comprises an additive A, an additive B and an additive C; the primary composite particles and a carbon source liquid are combined, and then spray drying and heat treatment or direct spray pyrolysis are performed to obtain secondary composite particles; the secondary composite particles obtained in step 2 are modified in a surface modification liquid, and then low-temperature annealing is performed at 150-300 DEG C to obtain the silicon-graphite composite material; the surface modification liquid is an organic solution in which an electrically conductive lithium salt and an additive D are dissolved; and based on the combined control of the preparation process and structure, the silicon-based negative electrode material with super-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention provides an iron-aluminum alloy coating, a preparation method thereof and an alloy structure, and the iron-aluminum alloy coating comprises the following components in percentage by mass: 58-72% of FeAl, 12-18% of Ni, 6-12% of Cr, 2-8% of Ti, 1-5% of Si, 1-5% of NH4Cl, 0.1-0.3% of rare earth element and the balance of Al. A compact oxide or intermetallic compound film layer can be formed, and corrosion of a metal base material is effectively prevented. On the basis, the reasonable iron-aluminum alloy is adopted, so that the brittleness of the coating is prevented from being too high, the coating keeps certain toughness, and the wear resistance of the coating is further enhanced. The interface structure between the coating and the matrix can be optimized, the binding force between the coating and the matrix is enhanced, the coating is prevented from peeling or cracking in the using process, and the service life of the coating is prolonged. The aluminum alloy coating can be applied to thermal power plant boilers, the overall performance of the boilers is effectively improved, and the service life is effectively prolonged.

The present application relates to the technical field of concrete materials, and specifically discloses an underwater non-dispersible concrete and a preparation process thereof. The underwater non-dispersible concrete comprises the following raw materials: cement, mineral admixture, coarse aggregate, fine aggregate, water reducer, early strength agent, retarder, water, anti-dispersant and composite fiber, wherein the anti-dispersant mainly comprises polyacrylate, vinyl neodecanoate and pentasodium diethylenetriamine pentaacetate; the preparation process comprises the following steps: mixing cement, early strength agent, retarder and anti-dispersant with composite fiber to obtain mixture A; mixing coarse aggregate and fine aggregate and mineral admixture to obtain mixture B; mixing mixture A and mixture B, and then adding the water reducer mixed with water, mixing, and obtaining underwater non-dispersible concrete. The present application has the characteristics of improving the anti-dispersibility and compressive strength of underwater non-dispersible concrete.

The invention discloses a manufacturing method of a novel solid electrolyte interface layer. The manufacturing method comprises the following steps: S1, compounding lithium perchlorate, lithium bis (oxalato) borate and an organic solvent into a mixed solution; s2, adding a certain amount of fluoroethylene carbonate or tris (2, 2, 2-trifluoroethyl) phosphoric acid, and continuously stirring uniformly to form a liquid electrolyte; s3, taking the conductive base material as a substrate, and depositing a cathode electrochromic material; s4, liquid electrolyte is used, the cathode electrochromic material is used as a working electrode, and after the cathode electrochromic material circularly works for not less than 10 circles under a specific voltage window, a solid electrolyte interface layer which is not less than 20 nm thick and rich in LiF is formed on the surface of the cathode electrochromic material in an in-situ growth mode. The prepared novel solid electrolyte interface layer has excellent electrochemical stability and cycling stability, effectively improves the performance of an electrochromic device, prolongs the service life of the electrochromic device, reduces the production cost, and has important application value and market prospect.

This invention relates to a device and method for testing the interlayer bond strength of brittle fiber mats. The testing device includes a worktable, a Z-axis linear module, an X-axis linear module, a force gauge, a clamping and fixing structure, a gasket, an online imaging device, and a control and data processing system. The Z-axis linear module is fixed to the worktable, the X-axis linear module is fixed to the Z-axis linear module slider, and the force gauge is fixed to the X-axis linear module slider. The clamping and fixing structure includes a base and two clamping fixtures, with the gasket held at both ends by the fixtures. This invention uses indirect clamping with gaskets to avoid fiber breakage and slippage caused by direct clamping of the sample, eliminating clamping interference. The dual linear modules work together to achieve oblique upward progressive peeling, avoiding violent tearing of the sample and ensuring accurate and repeatable test results. The accompanying online imaging device enables real-time observation of the peeling process, facilitating the establishment of a correlation between macroscopic mechanical response and microscopic damage mechanism, effectively improving the completeness of test data and the depth of mechanism analysis.

The application discloses a phosphorus-carbon-aluminum fluoride composite material, a preparation method and application thereof, and a lithium ion battery negative electrode. The phosphorus-carbon-aluminum fluoride composite material comprises a phosphorus-carbon matrix and aluminum fluoride crystals dispersed in the phosphorus-carbon matrix, stable phosphorus-carbon covalent bonds are formed in the phosphorus-carbon matrix, and the mass ratio of the aluminum fluoride crystals to the phosphorus-carbon matrix is 5-20:80-95. Through mechanical force action of high-energy ball milling, the phosphorus source and the carbon material are promoted to form phosphorus-carbon covalent bonds, and meanwhile, the aluminum fluoride crystals are uniformly dispersed in the phosphorus-carbon matrix. The carbon material improves the conductivity of the material, the phosphorus-carbon bond enhances the interface bonding force and inhibits volume expansion, and the aluminum fluoride optimizes the interface structure, inhibits the dissolution and oxidation of polyphosphorus compounds. The three components synergistically make the material have high conductivity, structural stability and interface stability. The aluminum fluoride as an additive can significantly improve the fast-charging performance and long cycle life of the lithium ion battery.

The invention relates to the technical field of electrochemistry, in particular to an electrochemical sensor for detecting PFOA (perfluorooctanoic acid) based on fluorine-fluorine interaction and an electrochemical detection method of the PFOA. The invention discloses an electrochemical sensor for detecting PFOA (perfluorooctanoic acid) based on fluorine-fluorine interaction. The electrochemical sensor comprises a counter electrode, a reference electrode, a signal acquisition and processing unit, an electrolyte solution and a working electrode, the electrolyte solution is a potassium ferricyanide solution containing 0.1 M of KCl, and the working electrode is formed by dispensing an electrode material F-COF / MWCNTs-NH2 on the electrode; when the working electrode is placed in an electrolyte solution containing PFOA, fluorine atoms in an electrode material F-COF / MWCNTs-NH2 on the working electrode and fluorine atoms on the PFOA adsorb the PFOA on the surface of the working electrode based on fluorine-fluorine interaction, and then potassium ferricyanide is matched to serve as an oxidation-reduction probe, so that electrochemical detection on the PFOA can be effectively realized. Therefore, the detection problem that the PFOA has no electrochemical activity in the prior art is solved, and accurate and high-sensitivity quantitative detection on the PFOA is realized.

The invention relates to a novel quaternary alloy core-shell quantum dot and a preparation method thereof, CdZnSeS is adopted as a core, a ZnxCd1-xSeyS1-y transition layer is introduced, and ZnS is adopted as a shell layer, so that a quaternary alloy core-shell structure is formed. A temperature increasing growth strategy is adopted, and parameters such as the proportion, the dropwise adding sequence, the dropwise adding speed and the reaction temperature of a precursor solution are controlled, so that the prepared quantum dot not only reduces the use of a Cd element, reduces the environmental risk and the biotoxicity, but also improves the stability and the fluorescence efficiency on the premise of ensuring the high yield. The specific preparation method comprises the following steps: respectively preparing precursor solutions containing a cadmium source, a zinc source, a sulfur source, a selenium source and the like, and reacting according to a specific sequence and conditions to form a quantum dot core, a transition layer and a shell layer. In addition, by adjusting the component proportion and controlling the temperature, adjustment of the light emitting wavelength of the quantum dots and optimization of the performance are achieved, the problem that the quantum dots are unstable in practical application is solved, and wide application prospects are achieved.

The present invention discloses a photocatalyst and its application. Using light as a driving force, a method for selectively oxidizing 5-hydroxymethylfurfural to generate 2,5-furandicarboxaldehyde under the promotion of a photocatalyst based on perylene imide supramolecule / indium zinc sulfide. The method described in the present invention is the first to use a perylene imide supramolecule / indium zinc sulfide composite material as a catalyst, an oxygen-containing gas as an oxidant, and acetonitrile as a solvent, and catalyze 5-hydroxymethylfurfural under the irradiation of sunlight or a xenon lamp without affecting the active aldehyde group, and the C-H bond and the O-H bond in the target hydroxymethyl group are oxidatively broken, respectively, to generate a method for generating a 2,5-furandicarboxaldehyde compound. The method of the present invention has the characteristics of simple operation, green and efficient, mild reaction conditions, easy separation of the catalyst and the reaction system, and can be applied for multiple cycles, and has broad application prospects.

The invention relates to a high-efficiency wear-resistant ceramic coating and a preparation method thereof, and belongs to the technical field of coating material preparation, and the preparation method specifically comprises the following steps: compounding a metal oxide and a nitride, modifying with a silane coupling agent, and mixing with a carbide to prepare a wear-resistant reinforcing material. And mixing the material with shell powder, sintering, cooling, ball-milling and screening. And finally, mixing the treated material with resin according to a ratio of 1g: (0.2-0.3) g, and stirring at 400-600rpm for 5-6 hours to obtain the high-efficiency wear-resistant ceramic coating. The invention provides a high-efficiency wear-resistant ceramic coating and a preparation method thereof so as to meet high requirements of complex industrial environments on coating performance. By optimizing a preparation process and a modification technology, the wear resistance, the high-temperature stability and the overall performance of the coating are improved, and a new technical path and a new solution are provided for development of the coating industry.